框架结构毕业设计外文文献翻译
毕业论文(设计)外文文献翻译及原文

金融体制、融资约束与投资——来自OECD的实证分析R.SemenovDepartment of Economics,University of Nijmegen,Nijmegen(荷兰内梅亨大学,经济学院)这篇论文考查了OECD的11个国家中现金流量对企业投资的影响.我们发现不同国家之间投资对企业内部可获取资金的敏感性具有显著差异,并且银企之间具有明显的紧密关系的国家的敏感性比银企之间具有公平关系的国家的低.同时,我们发现融资约束与整体金融发展指标不存在关系.我们的结论与资本市场信息和激励问题对企业投资具有重要作用这种观点一致,并且紧密的银企关系会减少这些问题从而增加企业获取外部融资的渠道。
一、引言各个国家的企业在显著不同的金融体制下运行。
金融发展水平的差别(例如,相对GDP的信用额度和相对GDP的相应股票市场的资本化程度),在所有者和管理者关系、企业和债权人的模式中,企业控制的市场活动水平可以很好地被记录.在完美资本市场,对于具有正的净现值投资机会的企业将一直获得资金。
然而,经济理论表明市场摩擦,诸如信息不对称和激励问题会使获得外部资本更加昂贵,并且具有盈利投资机会的企业不一定能够获取所需资本.这表明融资要素,例如内部产生资金数量、新债务和权益的可得性,共同决定了企业的投资决策.现今已经有大量考查外部资金可得性对投资决策的影响的实证资料(可参考,例如Fazzari(1998)、 Hoshi(1991)、 Chapman(1996)、Samuel(1998)).大多数研究结果表明金融变量例如现金流量有助于解释企业的投资水平。
这项研究结果解释表明企业投资受限于外部资金的可得性。
很多模型强调运行正常的金融中介和金融市场有助于改善信息不对称和交易成本,减缓不对称问题,从而促使储蓄资金投着长期和高回报的项目,并且提高资源的有效配置(参看Levine(1997)的评论文章)。
因而我们预期用于更加发达的金融体制的国家的企业将更容易获得外部融资.几位学者已经指出建立企业和金融中介机构可进一步缓解金融市场摩擦。
土木工程专业毕业设计外文文献及翻译

土木工程专业毕业设计外文文献及翻译Here are two examples of foreign literature related to graduation design in the field of civil engineering, along with their Chinese translations:1. Foreign Literature:Title: "Analysis of Structural Behavior and Design Considerations for High-Rise Buildings"Author(s): John SmithJournal: Journal of Structural EngineeringYear: 2024Abstract: This paper presents an analysis of the structural behavior and design considerations for high-rise buildings. The author discusses the challenges and unique characteristics associated with the design of high-rise structures, such as wind loads and lateral stability. The study also highlights various design approaches and construction techniques used to ensure the safety and efficiency of high-rise buildings.Chinese Translation:标题:《高层建筑的结构行为分析与设计考虑因素》期刊:结构工程学报年份:2024年2. Foreign Literature:Title: "Sustainable Construction Materials: A Review of Recent Advances and Future Directions"Author(s): Jennifer Lee, David JohnsonJournal: Construction and Building MaterialsYear: 2024Chinese Translation:标题:《可持续建筑材料:最新进展与未来发展方向综述》期刊:建筑材料与结构年份:2024年Please note that these are just examples and there are numerous other research papers available in the field of civil engineering for graduation design.。
MVC框架中英文对照外文翻译文献

MVC框架中英⽂对照外⽂翻译⽂献中英⽂对照外⽂翻译⽂献(⽂档含英⽂原⽂和中⽂翻译)译⽂:Web 2.0下的Spring MVC框架摘要 - 当要建⽴丰富⽤户体验的WEB应⽤时,有⼤量的WED应⽤框架可以使⽤,却很少有该选择哪⼀种的指导。
WEB 2.0应⽤允许个体管理他们⾃⼰的在线⽹页,并能与其他在线⽤户和服务器共享。
这样分享需要访问控制器来实现。
然⽽,现有的访问控制器解决⽅案不是令⼈很满意。
因为在开放且由⽤户主导的WEB环境下,它满⾜不了⽤户的功能需求。
MVC框架是在所有的WEB开发框架中最受欢迎的。
模型-视图-控制器(MVC)是⼀种软件架构,如今被认为是⼀种体系结构在软件⼯程模式中使⽤。
该模式从⽤户界⾯(输⼊和演⽰)分离出了“领域逻辑”(基于⽤户的应⽤逻辑),它允许独⽴地开发,测试和维护每个分离的部分。
模型-视图-控制器(MVC)模型创建的应⽤分离为不同的层次应⽤,同时在每两者之间建⽴松散的耦合。
关键字 - Spring MVC, 结构, XStudio, SOA, 控制器I.绪论如何确切地定义⼀个⽹站为“WEB 2.0”的呢?关于这有着许多不同见解,使它很难精确地下⼀个确切的定论。
但当我们将所有的WEB开发框架过⼀遍之后它就会变得清晰了。
各种基于WEB开发的架构如下:●Ntier架构(Ntier Architecture)在软件⼯程中,多层架构(常被称为n-tier架构)是⼀种表⽰层,应⽤处理层和数据管理层在逻辑上分开处理的客户端-服务器架构。
例如,⼀个应⽤在⽤户与数据库之间使⽤中间件提供数据请求服务就⽤到了多层体系结构。
最为⼴泛应⽤的多层体系结构是三层架构。
N-tier 应⽤架构为开发者提供了⽤来创建了⼀个灵活且可复⽤的模型。
通过打破应⽤层次,开发者只需修改或添加⼀个特定的层,⽽不是要去重写⼀遍整个应⽤。
它需要有⼀个表⽰层,⼀个业务层或者数据访问层和⼀个数据层。
层(layer)和层(tier)之间的概念常常是可以互换的。
建筑结构设计及材料中英文对照外文翻译文献

中英文对照外文翻译文献(文档含英文原文和中文翻译)Structure in Design of ArchitectureAnd Structural MaterialWe have and the architects must deal with the spatial aspect of activity, physical, and symbolic needs in such a way that overall performance integrity is assured. Hence, he or she well wants to think of evolving a building environment as a total system of interacting and space forming subsystems. Is represents a complex challenge, and to meet it the architect will need a hierarchic design process that provides at least three levels of feedback thinking: schematic,preliminary, and final.Such a hierarchy is necessary if he or she is to avoid being confused , at conceptual stages of design thinking ,by the myriad detail issues that can distract attention from more basic considerations .In fact , we can say that an architect’s ability to distinguish the more basic form the more detailed issues is essential to his success as a designer .The object of the schematic feed back level is to generate and evaluate overall site-plan, activity-interaction, and building-configuration options .To do so the architect must be able to focus on the interaction of the basic attributes of the site context, the spatial organization, and the symbolism as determinants of physical form. This means that ,in schematic terms ,the architect may first conceive and model a building design as an organizational abstraction of essential performance-space in teractions.Then he or she may explore the overall space-form implications of the abstraction. As an actual building configuration option begins to emerge, it will be modified to include consideration for basic site conditions.At the schematic stage, it would also be helpful if the designer could visualize his or her options for achieving overall structural integrity and consider the constructive feasibility and economic ofhis or her scheme .But this will require that the architect and/or a consultant be able to conceptualize total-system structural options in terms of elemental detail .Such overall thinking can be easily fed back to improve the space-form scheme.At the preliminary level, the architect’s emphasis will shift to the elaboration of his or her more promising schematic design options .Here the architect’s structural needs will shift to approximate design of specific subsystem options. At this stage the total structural scheme is developed to a middle level of specificity by focusing on identification and design of major subsystems to the extent that their key geometric, component, and interactive properties are established .Basic subsystem interaction and design conflicts can thus be identified and resolved in the context of total-system objectives. Consultants can play a significant part in this effort; these preliminary-level decisions may also result in feedback that calls for refinement or even major change in schematic concepts.When the designer and the client are satisfied with the feasibility of a design proposal at the preliminary level, it means that the basic problems of overall design are solved and details are not likely to produce major change .The focus shifts again ,and the design process moves into the final level .At this stage the emphasiswill be on the detailed development of all subsystem specifics . Here the role of specialists from various fields, including structural engineering, is much larger, since all detail of the preliminary design must be worked out. Decisions made at this level may produce feedback into Level II that will result in changes. However, if Levels I and II are handled with insight, the relationship between the overall decisions, made at the schematic and preliminary levels, and the specifics of the final level should be such that gross redesign is not in question, Rather, the entire process should be one of moving in an evolutionary fashion from creation and refinement (or modification) of the more general properties of a total-system design concept, to the fleshing out of requisite elements and details.To summarize: At Level I, the architect must first establish, in conceptual terms, the overall space-form feasibility of basic schematic options. At this stage, collaboration with specialists can be helpful, but only if in the form of overall thinking. At Level II, the architect must be able to identify the major subsystem requirements implied by the scheme and substantial their interactive feasibility by approximating key component properties .That is, the properties of major subsystems need be worked out only in sufficient depth to very the inherent compatibility of their basic form-related and behavioral interaction . This will mean a somewhat more specificform of collaboration with specialists then that in level I .At level III ,the architect and the specific form of collaboration with specialists then that providing for all of the elemental design specifics required to produce biddable construction documents .Of course this success comes from the development of the Structural Material.The principal construction materials of earlier times were wood and masonry brick, stone, or tile, and similar materials. The courses or layers were bound together with mortar or bitumen, a tar like substance, or some other binding agent. The Greeks and Romans sometimes used iron rods or claps to strengthen their building. The columns of the Parthenon in Athens, for example, have holes drilled in them for iron bars that have now rusted away. The Romans also used a natural cement called puzzling, made from volcanic ash, that became as hard as stone under water.Both steel and cement, the two most important construction materials of modern times, were introduced in the nineteenth century. Steel, basically an alloy of iron and a small amount of carbon had been made up to that time by a laborious process that restricted it to such special uses as sword blades. After the invention of the Bessemer process in 1856, steel was available in large quantities at low prices. The enormous advantage of steel is its tensile forcewhich, as we have seen, tends to pull apart many materials. New alloys have further, which is a tendency for it to weaken as a result of continual changes in stress.Modern cement, called Portland cement, was invented in 1824. It is a mixture of limestone and clay, which is heated and then ground into a power. It is mixed at or near the construction site with sand, aggregate small stones, crushed rock, or gravel, and water to make concrete. Different proportions of the ingredients produce concrete with different strength and weight. Concrete is very versatile; it can be poured, pumped, or even sprayed into all kinds of shapes. And whereas steel has great tensile strength, concrete has great strength under compression. Thus, the two substances complement each other.They also complement each other in another way: they have almost the same rate of contraction and expansion. They therefore can work together in situations where both compression and tension are factors. Steel rods are embedded in concrete to make reinforced concrete in concrete beams or structures where tensions will develop. Concrete and steel also form such a strong bond─ the force that unites them─ that the steel cannot slip within the concrete. Still another advantage is that steel does not rust in concrete. Acid corrodes steel, whereas concrete has an alkaline chemical reaction, the opposite of acid.The adoption of structural steel and reinforced concrete caused major changes in traditional construction practices. It was no longer necessary to use thick walls of stone or brick for multistory buildings, and it became much simpler to build fire-resistant floors. Both these changes served to reduce the cost of construction. It also became possible to erect buildings with greater heights and longer spans.Since the weight of modern structures is carried by the steel or concrete frame, the walls do not support the building. They have become curtain walls, which keep out the weather and let in light. In the earlier steel or concrete frame building, the curtain walls were generally made of masonry; they had the solid look of bearing walls. Today, however, curtain walls are often made of lightweight materials such as glass, aluminum, or plastic, in various combinations.Another advance in steel construction is the method of fastening together the beams. For many years the standard method was riveting.A rivet is a bolt with a head that looks like a blunt screw without threads. It is heated, placed in holes through the pieces of steel, and a second head is formed at the other end by hammering it to hold it in place. Riveting has now largely been replaced by welding, the joining together of pieces of steel by melting a steel materialbetween them under high heat.Priestess’s concrete is an improved form of reinforcement. Steel rods are bent into the shapes to give them the necessary degree of tensile strengths. They are then used to priestess concrete, usually by one of two different methods. The first is to leave channels in a concrete beam that correspond to the shapes of the steel rods. When the rods are run through the channels, they are then bonded to the concrete by filling the channels with grout, a thin mortar or binding agent. In the other (and more common) method, the priestesses steel rods are placed in the lower part of a form that corresponds to the shape of the finished structure, and the concrete is poured around them. Priestess’s concrete uses less steel and less concrete. Because it is a highly desirable material.Progressed concrete has made it possible to develop buildings with unusual shapes, like some of the modern, sports arenas, with large spaces unbroken by any obstructing supports. The uses for this relatively new structural method are constantly being developed.建筑中的结构设计及建筑材料建筑师必须从一种全局的角度出发去处理建筑设计中应该考虑到的实用活动,物质及象征性的需求。
毕业论文 外文翻译格式

毕业论文外文翻译格式毕业论文外文翻译格式在撰写毕业论文时,外文翻译是一个重要的环节。
无论是引用外文文献还是翻译相关内容,都需要遵循一定的格式和规范。
本文将介绍一些常见的外文翻译格式,并探讨其重要性和应用。
首先,对于引用外文文献的格式,最常见的是使用APA(American Psychological Association)格式。
这种格式要求在引用外文文献时,先列出作者的姓氏和名字的首字母,然后是出版年份、文章标题、期刊名称、卷号和页码。
例如:Smith, J. D. (2010). The impact of climate change on biodiversity. Environmental Science, 15(2), 145-156.在翻译外文文献时,需要注意保持原文的准确性和完整性。
尽量避免意译或添加自己的解释,以免歪曲原文的意思。
同时,还需要在翻译后的文献后面加上“译者”和“翻译日期”的信息,以便读者可以追溯翻译的来源和时间。
其次,对于翻译相关内容的格式,可以参考国际标准组织ISO(International Organization for Standardization)的格式。
这种格式要求在翻译相关内容时,先列出原文,然后是翻译后的文本。
例如:原文:The importance of effective communication in the workplace cannot be overstated.翻译:工作场所有效沟通的重要性不容忽视。
在翻译相关内容时,需要注意保持原文的意思和语气。
尽量使用准确的词汇和语法结构,以便读者能够理解和接受翻译后的内容。
同时,还需要在翻译后的文本后面加上“翻译者”和“翻译日期”的信息,以便读者可以追溯翻译的来源和时间。
此外,对于长篇外文文献的翻译,可以考虑将其分成若干章节,并在每个章节前面加上章节标题。
这样可以使读者更容易理解和阅读翻译后的内容。
MVC设计模式THE-MVC-WEB-DESIGN-PATTERN大学毕业论文外文文献翻译及原文

毕业设计(论文)外文文献翻译文献、资料中文题目:MVC设计模式文献、资料英文题目:THE MVC-WEB DESIGN PATTERN文献、资料来源:文献、资料发表(出版)日期:院(部):专业:班级:姓名:学号:指导教师:翻译日期: 2017.02.14MVC设计模式Ralph F. Grove计算机科学,詹姆斯麦迪逊大学,哈里森堡,美国弗吉尼亚州***************Eray Ozkan计算机科学,詹姆斯麦迪逊大学,哈里森堡,美国弗吉尼亚州*****************关键字:web,web框架,设计模式,模型-视图-控制器模式摘要:模型-视图-控制器模式被引用为许多web开发框架的基础架构。
然而,用于web开发的MVC 版本随着原来的Smalltalk的MVC的演变而发生了一些改变。
本文介绍了对这些变化的分析,并提出了一种独立的Web-MVC模式,用于更准确的描述MVC是如何在web框架中实现的。
1.介绍模型-视图-控制器(Modle-View-Controller,MVC)设计模式被一些web应用框架作为基础架构,例如,Rails,以及Struts。
MVC最初是在施乐帕克研究中心(Goldberg和Robson,1985)开发的Smalltalk编程环境中实现的。
为了适应web框架,MVC已经演变成了另一种方式,最终成为一种不同于其他任何设计模式,也与原始的Smaltalk完全不同的模式的实现。
本文的第一个目标是介绍MVC设计模式,其中包括它的原始形态(第2节)以及现代众所周知的用于web应用框架的变更后的形态(第3节)。
第二个目标是对这个模式演变后发生的变化进行评估,同时呈现演变后版本的有效性(第3节)。
最后,我们提出了一个标准的MVC-Web设计模式的描述,用于反映目前在web框架中模式的使用,同时又能保持原始的MVC中令人满意的特性。
基于MVC的web应用框架的修订版本已经被提出了(Chun, Yanhua, 和Hanhong, 2003) (Barrett和Delaney, 2004)。
本科毕业设计外文文献翻译

(Shear wall st ructural design ofh igh-lev el fr ameworkWu Jiche ngAbstract : In t his pape r the basic c oncepts of man pow er from th e fra me sh ear w all str uc ture, analy sis of the struct ur al des ign of th e c ont ent of t he fr ame she ar wall, in cludi ng the seism ic wa ll she ar spa本科毕业设计外文文献翻译学校代码: 10128学 号:题 目:Shear wall structural design of high-level framework 学生姓名: 学 院:土木工程学院 系 别:建筑工程系 专 业:土木工程专业(建筑工程方向) 班 级:土木08-(5)班 指导教师: (副教授)nratiodesign, and a concretestructure in themost co mmonly usedframe shear wallstructurethedesign of p oints to note.Keywords: concrete; frameshearwall structure;high-risebuildingsThe wall is amodern high-rise buildings is an impo rtant buildingcontent, the size of theframe shear wall must comply with building regulations. The principle is that the largersizebut the thicknessmust besmaller geometric featuresshouldbe presented to the plate,the force is close to cylindrical.The wall shear wa ll structure is a flatcomponent. Itsexposure to the force along the plane level of therole ofshear and moment, must also take intoaccountthe vertical pressure.Operate under thecombined action ofbending moments and axial force andshear forcebythe cantilever deep beam under the action of the force levelto loo kinto the bottom mounted on the basis of. Shearwall isdividedinto a whole walland theassociated shear wall in theactual project,a wholewallfor exampl e, such as generalhousingconstruction in the gableor fish bone structure filmwalls and small openingswall.Coupled Shear walls are connected bythecoupling beam shear wall.Butbecause thegeneralcoupling beamstiffness is less thanthe wall stiffnessof the limbs,so. Walllimb aloneis obvious.The central beam of theinflection pointtopay attentionto thewall pressure than the limits of the limb axis. Will forma shortwide beams,widecolumn wall limbshear wall openings toolarge component atbothen ds with just the domain of variable cross-section ro din the internalforcesunder theactionof many Walllimb inflection point Therefore, the calcula tions and construction shouldAccordingtoapproximate the framestructure to consider.The designof shear walls shouldbe based on the characteristics of avariety ofwall itself,and differentmechanical ch aracteristicsand requirements,wall oftheinternalforcedistribution and failuremodes of specific and comprehensive consideration of the design reinforcement and structural measures. Frame shear wall structure design is to consider the structure of the overall analysis for both directionsofthehorizontal and verticaleffects. Obtain theinternal force is required in accordancewiththe bias or partial pull normal section forcecalculation.The wall structure oftheframe shear wall structural design of the content frame high-rise buildings, in the actual projectintheuse of themost seismic walls have sufficient quantitiesto meet thelimitsof the layer displacement, the location isrelatively flexible. Seismic wall for continuous layout,full-length through.Should bedesigned to avoid the wall mutations in limb length and alignment is notupand down the hole. The sametime.The inside of the hole marginscolumnshould not belessthan300mm inordertoguaranteethelengthof the column as the edgeof the component and constraint edgecomponents.Thebi-direc tional lateral force resisting structural form of vertical andhorizontalwallconnected.Each other as the affinityof the shear wall. For one, two seismic frame she ar walls,even beam highratio should notgreaterthan 5 and a height of not less than400mm.Midline columnand beams,wall midline shouldnotbe greater tha nthe columnwidthof1/4,in order toreduce thetorsional effect of the seismicaction onthecolumn.Otherwisecan be taken tostrengthen thestirrupratio inthe column tomake up.If theshear wall shearspan thanthe big two. Eventhe beamcro ss-height ratiogreaterthan 2.5, then the design pressure of thecut shouldnotmakeabig 0.2. However, if the shearwallshear spanratioof less than two couplingbeams span of less than 2.5, then the shear compres sion ratiois notgreater than 0.15. Theother hand,the bottom ofthe frame shear wallstructure to enhance thedesign should notbe less than200mmand notlessthanstorey 1/16,otherpartsshouldnot be less than 160mm and not less thanstorey 1/20. Aroundthe wall of the frame shear wall structure shouldbe set to the beam or dark beamand the side columntoform a border. Horizontal distributionofshear walls can from the shear effect,this design when building higher longeror framestructure reinforcement should be appropriatelyincreased, especially in the sensitiveparts of the beam position or temperature, stiffnesschange is bestappropriately increased, thenconsideration shouldbe givento the wallverticalreinforcement,because it is mainly from the bending effect, andtake in some multi-storeyshearwall structurereinforcedreinforcement rate -likelessconstrained edgeofthecomponent or components reinforcement of theedge component.References: [1 sad Hayashi,He Yaming. On the shortshear wall high-rise buildingdesign [J].Keyuan, 2008, (O2).高层框架剪力墙结构设计吴继成摘要: 本文从框架剪力墙结构设计的基本概念人手, 分析了框架剪力墙的构造设计内容, 包括抗震墙、剪跨比等的设计, 并出混凝土结构中最常用的框架剪力墙结构设计的注意要点。
框架结构的抗震设计思路外文文献翻译

文献信息:文献标题:Frame Structure Anti-earthquake Design Way of Thinking (框架结构的抗震设计思路)国外作者:Theodore V.Galambos文献出处:《Journal of Constructional Concrete Research》,2000, 55:289-303 字数统计:英文4451单词,22990字符;中文5601汉字外文文献:Frame Structure Anti-earthquake Design Way of ThinkingAbstract Currently, the anti-earthquake norms all round the world almost adopt to a kind of way of thinking: The adoption presses the earthquake strong or weak of possible situation to divide the line earthquake cent area; According to everyplace the history occurrence of the area earthquake of covariance result or to geology structure of the history investigate to have to explicit statistics the meaning establish the sport peak in waterproof and quasi-ground value acceleration; Make use of again the reaction acceleration that the acceleration reaction composes different period; Get a design to use acceleration level through earthquake dint adjust met coefficient R. In the meantime, most nations all approve such point,establishing to defend the earthquake intensity level can take to use a different value, choosing to use to establish to defend the earthquake intensity level more and highly, the ductility request of the structure also more low, choose to use to establish to defend earthquake intensity level more and lowly, structure of ductility request more high. The structure ductility guarantee of precondition is the ductility of the member, pass again an effectively reasonable conjunction in adopting a series of measure guarantee member the foundation of the ductility, the structure system choice is reasonable in the meantime, the degree just distributes reasonable of under condition ability basic assurance structure of ductility.Keywords: frame structure; anti-earthquake design; design way of thinking1.Simple Review of Anti-earthquake Design Way of ThinkingThe development that constructs the structure anti- earthquake is along with people all the earthquake move with the structure characteristic of the understanding is continuously thorough but develop gradually, however, from is born up to now the history of a hundred years, have mostly several to develop a stage as follows:(1) Quiet dint stage: It first from a Japanese professor passed to harm to prognosticate the anti- earthquake design theories that put forward with the theories understanding at that time to the limited earthquake, being applicable to only just rigid body structure. It didn't think characteristic and the place difference to consider structure to the influence that constructs structure.(2) Respond the table stage: Along with vibrate to record of obtain and the development of the structure dynamics theories, the Biota professor of the United States put forward flexibility to respond the concept of the table in 1940, respond the table is list the freely flexible system, it was obtain of numerous earthquakes record of encourage, the structure period or respond of the relation, include the acceleration reaction table, the speed responded a table, moved to respond a table. It consider the motive characteristic of the structure, it still is the foundation that all countries norm design earthquake dint takes a value up to now. The calculation of the earthquake function dint usually use shears with the bottom and flaps a decomposition to respond a table a method, flapping a decomposition to respond a table a method of basic define: Suppose the building structure is the line flexibility more freedom degree system, making use principle of flap a decomposition and flap a type, it will solve a freedom degree the earthquake of the flexible system to respond to resolve for solve an independence of etc. the effect single freedom degree flexible system most the heavy earthquake respond. Then begging should in each function affect that flaps a type. At this time, according to consider the way dissimilarity of the earthquake function, adopt a different array, group method, order flexible system to many qualities of the flat surface vibration, it can use a SRSS method, it is according tosuppose the importation earthquake as steady random process, each of a flap reaction is independent mutually but deduce to get; For consider even-twists many qualities that the lotus connect to order flexible system, the adoption CQC method, it lies in with the main differentiation of the SRSS method: Suppose when flat surface vibrate each flap a type independent mutually, and each contribution that flap a type increased along with the frequency high but lower;But even-twist lotus connect hour each flap a frequency span very small, close together and higher flap the frequency of the type and may near to this relativity that will consider a dissimilarity to flap a very much, also have influence of turn round the weight and not necessarily increase along with the frequency high but lower, sometimes higher flap the influence possibility of the type big in lower flap the influence of the type, it will consider more influences that flap a type while comparing SRSS. The bottom shears the dint method in consideration of the special of the structure system to the simplification that flaps a decomposition to respond to compose a method, be the building height not big, took shearing to slice to transform as the lord and the quality to follow height to distribute more even structure with degree just, the structure vibration moved to respond usually with the first flapped a type for lord, and when the first flapped a type to near to in the straight line, can flap a decomposition method simplification to shear the dint method calculation formula for the basic bottom. The level earthquake function that each quality that this basic formula calculation get order can better reflection just degree bigger structure, but when structure the basic period was long, the place characteristic period to compare with hour, the calculation income coping earthquake function be partial to small. of course , the Anti-earthquake Norm provision, be the structure basic period more than 1.4 place characteristic period, at coping additional level earthquake function.(3)the motive theories stage: Along with move understanding and comprehend to the earthquake of deepen continuously, know to some shortage of the reaction table, such as to the earthquake move hold of influence consideration not week, and the exaltation of the calculator function, make the motive method develop gradually, its essence solves a square distance of motive directly, but because of earthquake theground sport acceleration is very irregular, it can't beg for differential calculus square distance, it shuts to match a solution, so adopt number integral calculus method more. Usual way of doing is carry on a continuous cent a segment a processing towards having already record of the earthquake wave, each data all see do the constant, then the function get to structure up, pass an equilibrium and square distance of motive to beg at the moment of the acceleration, speed, move reaction, moving with ex- the acceleration, speed, the segment to carry on folding to add immediately after folding the result for add as the beginning that descends at that time a segment to start a data, pushing according to this kind, end beg structure at the give for low week again and again the earthquake wave under of the acceleration, speed and move the dint reaction variety process.(4) At American Northridge earthquake in 1994 and Japanese Kobe earthquake in 1995 after, the beautiful day scholar put forward again according to the anti- earthquake design method of behavior, it was during the period of usage to make the building structure satisfy various requests that used function according to the basic thought of behavior. Tradition according to the design method dissimilarity of the dint, adjudicate to the structure function mainly is according to move standard, move index sign to come with the different to the structure function to carry on a different control. But descend structure because of the big earthquake of not- flexible transform hard and accurate estimate of, make to can stay around according to the design method of behavior theoretically. But put forward its aggressive meaning to have 2:00 at least:a. Emphasize the system and the society of the earthquake engineering;b. The part that knows an original anti- earthquake to design norm is unsuited to reasonableness.Conduct and actions according to the foundation of the function anti- earthquake design, should to the particular level earthquake function of a certain covariance meaning under of the structure move, the speed and acceleration carry on accurate valuation, should also have a reasonable of valuation method with available valuation tool. It is exactly because of this purpose, put forward and developed the Pushover method and ability to compose a method. The basic way of thinking of the Pushovermethod is an adoption the quiet dint add to carry, supposing the side of the some penny cloth form toward lotus to carry a function on the structure, adding to carry gradually until attain the structure control point target to move or the structure break, getting the level side of the control point to move to shear the dint relation curve with substrate thus, evaluating in order to the anti-vibration ability of the structure. The Pushover method depends on to distribute a form and play the plasticity reaction table target to move to really settle in the side force.2.Basic Way of Thinking of Frame Structure Anti-earthquake Design—ductility StandardAfter the flexibility respond table put forward, the people's detection computes to gain from here of the structure respond with the actual earthquake the breakage phenomenon of the structure contain certain antinomy, mainly is press the flexibility reaction table to calculate of the structure responded the acceleration as habitual to design the earthquake dint to take to be worth big quite a few at that time doubly, and took to settle according to the habitual of the function of the design earthquake dint descends the house structure of design, the harm of the structure system wasn't serious in the earthquake.60's last century, the New mark passed to start to the beginning of different period just degree homology of the single freedom degree the system carried on analysis under the situation that many waves input, put forward etc. moved the principle and etc. energy principle, and put forward the concept of the structure ductility. Studied single and free system to accept defeat the level and flexibility thoroughly again from the relation of flapped the biggest not- flexible motive in the period and structure to respond afterward, this be customarily say of the theories of the R-μ -T effect. Passing these researches, announcing to public the ductility ability and plasticity to consume an ability is a structure Be taking to use to accept defeat level under not high circumstance, at big earthquake under the structure doesn't take place severity to break and doesn't don't tumble down of assurance. Arrive here, concerning the design earthquake dint's taking the basic problem of the value size have to arrive understanding definitely, be the anti- earthquake the earthquake dinttake a value of the size isn't a number of assurance, but with the structure ductility function and consume the ability mechanism related quantity value. Here what to need to be explain BE, designed the earthquake dint to take a value to resolve a problem only, but to the structure ductility function guarantee of the measure have to can also promise, this will at underneath a section discuss.Currently, the anti- earthquake norms all round the world almost adopts so a kind of way of thinking: The adoption presses the earthquake strong or weak of possible situation to divide the line earthquake cent area; According to everyplace the history occurrence of the area earthquake of covariance result or to geology structure of the history investigate to have to explicit statistics the meaning establish the sport peak value in waterproof and quasi- ground value acceleration; Make use of again the reaction acceleration that the acceleration reaction composes different period to descend structure to; get a design to use acceleration level through the earthquake dint adjustment coefficient R. In the meantime, most nations all approve such standpoint, establishing to defend the earthquake intensity level can take to use a different value, choosing to use to establish to defend the earthquake intensity level more and highly, the ductility request of the structure also more low, choose to use to establish to defend the earthquake intensity level more and lowly, structure of ductility request more high. The structure ductility guarantee of precondition is the ductility of the member, pass again an effectively reasonable conjunction in adopting a series of measure guarantee member the foundation of the ductility, the structure system choice is reasonable in the meantime, the degree just distributes reasonable of under condition ability basic assurance structure of ductility.Underneath this kind of discusses the our country anti- earthquake norm mostly way of thinking, the current Chinese norm didn't adopt a variety to establish to defend the earthquake intensity level to take to use, but don’ Ted add a distinction of unify an adoption of the earthquake dint adjustment coefficient R=1/0.35;In the meantime, mostly according to establish a dissimilarity of defend the earthquake intensity, divide the line the different anti- earthquake grade, fix attention on in establish to defend earthquake intensity differently, adopt the anti- earthquake measure of the differentassurance ductility. Very obvious here exist a misunderstanding of concept, also be according to the theories of the R-μ-T effect, the little more than earthquake dint adjustment coefficient R=1/0.35, should give the same ductility guarantee measure to the structure, but the Chinese norm adopt the different ductility guarantee measure, along with anti- earthquake the exaltation of the grade, ductility guarantee the ability correspond to strengthen. This kind of usefulness of the way of doing under way and not the line motive respond of verification, can describe so as a result mostly: For the district of 8 degrees 0.3 g and 9 degrees 0.4 g, because of correspond of the anti- earthquake grade is higher, the measure of the guarantee ductility is also stronger, so generally and more safe; And for the district of 6 degrees 0.05 g and 7 degrees 0.1 g, gain from here to of the level earthquake effect be partial to small, the general lotus carries an array, group is carried the control function by the gravity lotus, although to should of the measure of the guarantee ductility isn't very strong, can also guarantee structure generally under the big earthquake of not- flexible transform of function; But to the district of 7 degrees 0.15 g and 8 degrees 0.2 g, circumstance another the person worry, because of at the lotus carry an array, group, the earthquake function can have generally control function, but correspond measure of guarantee the ductility and be partial to weak, so difficult don't need to exist certain potential safety hazard to suffer from. See again other national earthquake dint adjustment coefficient R to choose to use, in order to have kept concrete understanding of view:The earthquake dint adjustment coefficient of all countries norm provision3.Ability Design MethodTop a part emphasized to discuss the design earthquake dint to take the problem of the value, but wanted to promise structure under the big earthquake of function, also need to establish the valid anti- earthquake measure, make the structure really have need of keep vertical loading under the dint condition not- flexible transform an ability, this be the so-called ability design method.Ability design method from New Zealand the reinforced concrete anti- earthquake expert scholars such as the T. Parlay and the R. Park etc. development with initiate, main way of thinking is to the member occasionally member dissimilarity inside the piece is subjected to the dint form of the loading ability differ of control, promise the reinforced concrete structure formation the beam swing joint organization and ductility bigger is cut noodles to be subjected to the dint breakage appearance, make the structure have to play plasticity to transform function enough, promise big earthquake hour have an enough ability to consume to spread function, avoid creation brittleness to break and appear disadvantageous of organization form. The key of the ability design method is the anti- earthquake design that leads the control concept into structure, there is the leading formation of the purpose to the beneficial breakage mechanism is to the structure and break mode, avoid not reasonable of the structure break appearance, and try assurance to anticipate to break part to play plasticity to transform an ability.The ability design method mainly passes the following three kinds of measure to give assurance:1. Enlarge pillar opposite in the anti- of the beam-curved ability, artificial of leading of the structure swing joint part.2. Raise opposite in is cut the noodles loading dint of the anti- shear ability, avoiding appearing non- ductility to shear to slice breakage.3. To the part that appears the plasticity swing probably, the adoption corresponds of structure measure, assurance necessity of not- flexible transform function.First, the reasonable part of the swing joint carry on a discussion, all countriesmostly of the way of thinking inclines toward to make the project that the beam carries first to carry to appear in the pillar about and all. This kind of swing joint project has a following advantage: The ductility of the beam is easy to a control, and under general circumstance compare pillar of the ductility is big; The whole plasticity of the beam swing joint ratio pillar swing joint formation transform small; The plasticity of the beam swing joint organization formation transform more stable. There are also two kinds of different design methods while admit the premise of have the initiative the formation beam swing joint, a kind of from is a representative New Zealand of, incline toward the formation ideal beam swing joint organization, be promise the beam carries to appear the plasticity swing, but in addition to first floor, the post all doesn't appear the plasticity swing, at this time to in addition to the first floor pillar give post opposite compare bigger and super and strong coefficient(probably 2.0) in the beam, the advantage is a post(in addition to first floor) and doesn't need to be carry on to go together with hoop complicatedly at this time, because of adopt such coefficient can promise a swing joint very explicit. But is exactly because this kind of design method pursues the ideal beam swing joint organization to cause the first floor post compare weaker, the possibility for throng will be a swing joint, the plasticity that correspond and then have to adopt the structure measure to promise this part transforms function. In the meantime, such as if the first floor the influence of the swing joint upon the structure will compare greatly, once pressing and mating because structural whole tumble down, this has to be given guarantee up from the structure, increasing a structure of difficulty. Another project includes total body, Chinese etc. in the United States, Europe, this kind of project leading structure pillar swing joint the night appears in the beam swing joint, unlimited make the emergence of the swing joint in the meantime, but request structure and do not become the layer side to move structure, at this time to post of super go together with coefficient to compare with to request New Zealand of want to be small, goes together with the project that the stirrup takes in to control to the post adoption in the meantime. BE super to go together with coefficient to really settle problem comparison complications to the post adoption in fact: The beam carries thesuper influence for go together with for construct; The beam carries the plasticity swing to appear inside the dint is heavy to distribute of influence; Before accept defeat of the not- flexible characteristic may make the post bending moment physically big get in the flexibility analysis of bending moment ;The indetermination factor that the material difference bring; Growth of the structure not- flexible characteristic cause the influence etc. that the structure motive characteristic variety bring. According to the request of the ability design, the plastic hinge that shears the dint wall appears generally in the bottom of the wall limb. The joining beam shear the loading dint and ductility that the loading dint and ductility and entrance to cave of the dint wall connect beam contain very great relation, designing generally and possibly weak connect beam, the leading that has intention to know connects beam at earthquake accept defeat first, then is the bottom wall to accept defeat, also be anticipate the area of plastic hinge to accept defeat.Avoided appearing to shear reason of slice the breakage early easy, be because of shearing to slice to break to belong to the brittleness breakage, disadvantage in promise the ductility of the structure, promise of way be according to the dissimilarity of the anti- earthquake grade to all beams, pillars, wall etc. the adoption is opposite to bend in the anti- of different super go together with coefficient.The basic request that the anti- earthquake anti- shear is before the beam carry plastic hinge that big epicenter need turn to move and don't take place to shear to slice breakage, this sheared concept difference with the non- anti- earthquake anti-.For various different processing methods that the structure anti- of the member shears mechanism and the our country norm, there is the necessity elucidation here once. Beam: When anti- shake because of low week again and again the function made the beam appear to cross an inclined fracture, fissure, the inclined fracture, fissure distributed an anti- of come to a decision the anti- earthquake to shear the ability ratio not an anti- earthquake to have to descend, reason: The anti- shake of shear to slice to break occurrence after the end long tendon accept defeat, the fracture, fissure compare at this time greatly; The harm that crosses the emergence of the fracture, fissure to the concrete is more serious; The enlargement beam carried the number of the negativebending moment when anti- shake, cause bigger sheared the dint value to appear under the beam to carry, sprinkle plank now because of descending to carry to have no, break more easily. But at this time the function and function for non- anti- to shake of the stirrup differ only a few, in the norm to the consideration of this disadvantageous function is to adopt to resist to shear formula in to the concrete item 0.6 of fold to reduce, in the meantime, in order not to non- ductility of inclined break bad, while adopting to shake than the non- anti- more scathing restriction measure, cut noodles to shear the dint design value ratio non- anti- earthquake multiply 0.8 of fold and reduce coefficient. Pillar: It resist earthquake in the norm the anti- of the pillar shear the processing principle of the formula similar, also is adopt to the concrete item 0.6 of fold and reduce coefficient, adopt more scathing measure to prevent from equally inclined break bad, cut noodles to shear the dint design value ratio non- anti- earthquake multiply 0.8 of fold and reduce coefficient. But because of under general circumstance, the stalk pressure comparison of the pillar is big, this kind of pressure shears function to be partial to the anti- of the member after appearing the plastic hinge to the pillar emollient, according to this kind of way of thinking, pillar the adoption fold to reduce with beam similarly to seem to be not greatly reasonable. Wall: When the anti- shake, there is almost no related on trial data in domestic, is an adoption only the earthquake is to the non- anti- of the anti- sheared formula to adopt to the concrete item and the reinforcing bar items 0.8 of fold and reduce coefficient, in the meantime, in bar of and inclined break bad, adoption the restriction shear a way of press the ratio, cut noodles to shear the dint design value ratio non- anti- earthquake multiply 0.8 of fold and reduce coefficient. What to need to be explaining BE, under general circumstance, the part that shears the dint wall anti- to shear a problem probably is a lower part are a few floors. Node: The main acceptance shears the dint member, the node shears dint mainly is depend on the truss organization, inclined press pole organization, the stirrup of the stipulation effect three organizations or path to bear. The truss organization mainly is resist the reinforcing bar lord to pull should dint, inclined press the pole organization mainly is the lord that resists the concrete and the reinforcing bar creation to press should dint, the stipulation effect of thestirrup then strengthens the anti- of the concrete to shear ability. Along with the node concrete inside the area not- line development, the truss the function of the structure lets up continuously, and then both of function but be strengthening continuously. Therefore, the main target of the node anti- earthquake is under the situation that be subjected to dint again and again, pass to strengthen inclined press the pole organization and the stirrup to control an effect to avoid the core area concrete inclined to press thus a diplomatic corps to order at attain to anticipate of the big earthquake respond before do not take place to shear to slice breakage.After shearing the discussion of mechanism to the above anti-earthquake, can be do with the function of the beam stirrup to tally up as follows: The first obvious function is to used for an anti- to shear; The second function controls concrete, this to guarantee the structure ductility contain count for much function, can also say literally here the obstacle that once high and strong concrete meet when used for anti- earthquake, this is related with the material of the high and strong concrete first, strength more high concrete more frailty, its should attain in the dint contingency relation biggest press should the contingency of the dint is smaller, this makes the design become the ductility member a difficulty with very great formation, is more high because of the strength of the concrete in the meantime, the stirrup rises the effect of the stipulation more bad, also can't the extreme limit of the enough valid exaltation concrete press a contingency, so cause to adopt the ductility of the structure member of the high and strong concrete hard get a guarantee; The third function is the stipulation function that carries to the beam lengthways reinforcing bar, prevent forming lengthways reinforcing bar lose steady, this has something to do with the special material of the reinforcing bar.中文译文:框架结构的抗震设计思路摘要目前,世界各国的抗震规范都采用这种思路:按可遇地震的强弱划分地震分区;根据各地区的历史发生地震的统计或对地质构造的考察得出设防水准地面的运动峰值加速度;再利用加速度反应谱给出不同周期下结构的反应加速度;通过地震力调整系数R得到设计加速度水准。
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Spring框架-毕业论文外文文献翻译

外文文献翻译SpringFrameworkSpring is an open source framework, and Spring was launched in 2003 as a lightweight Java development framework created by Rod Johnson.In a nutshell, Spring is a hierarchical, JavaSE/EEfull-stack (one-stop) lightweight open source framework.The powerful JavaBeans based configuration management using the Inversion of Control (IoC) principle makes application components faster and easier.1.facilitate decoupling and simplify developmentThrough the IoC container provided by Spring, we can control dependencies between objects by Spring, avoiding excessive program coupling caused by hard coding.With Spring, users do not have to write code for the bottom tier requirements of single instance schema classes, properties, file parsing, and so on, and can focus more on top tier applications.2.AOP programming supportThrough the Spring functionality provided by AOP, it is easy to implement face oriented programming, and many features that are not easily implemented with traditional OOP can be easily handled by AOP.3.declarative transaction supportIn Spring, we can extricate ourselves from tedious and tedious transaction management code and flexibly manage the transaction through declarative manner, so as to improve the efficiency and quality of development.4.convenience program testingAlmost all test work can be done in a non container dependent programming manner, and in Spring, testing is no longer expensive, but something to do.For example, Spring supports Junit4 and can easily test Spring programs by annotations.5.convenient integration of various excellent frameworkSpring does not exclude all kinds of excellent open source framework, on the contrary, Spring can reduce the difficulty of the use of Spring framework, provides a framework for a variety of excellent (such as Struts, Hibernate, Hessian, Quartz) directly support the.6.reduce the difficulty of using Java EE APISpring provides a thin layer of encapsulation for many difficult Java, EE, API (such as JDBC, JavaMail, remote calls, etc.), and the use of these Java EE API is greatly reduced through the simple package of Spring.7.Java source code is a classic example of learningSpring source code, clear structure, exquisite design originality, embodies the master of the Java design pattern and the flexible use of Java technology accomplishment.Spring framework source code is undoubtedly the best practice example of Java technology.If you want to quickly improve your Java skills and application development level in a short time, learning an.The role of MVC - Spring is integration, but not just integration, and the Spring framework can be seen as a framework for enterprise solution levels.The client sends a request, the server controller (implemented by DispatcherServlet) to complete the request forwarding, call a controller for mapping class HandlerMapping, the class is used to map requests to the corresponding processor to process the request.HandlerMapping will request is mapped to the corresponding processor Controller (equivalent to Action) in Spring if you write some processor components, the general implementation of the Controller interface in Controller, you can call Service or DAO to operate data from the DAO ModelAndView used to store the retrieved data, some data can also be stored in response to the view.If you want to return the result to the user, it also provides a view of ViewResolver component in Spring framework, the component labeled Controller returns according to, find the corresponding view, the response response back to the user.Each module (or component) that makes up the Spring framework can exist alone, or can be implemented in conjunction with one or more other modules.Each module has the following functions: 1, the core container: the core container provides the basic functionality of the Spring framework (Spring, Core).The main component of the core container is BeanFactory, which is implemented in factory mode.BeanFactory uses the control inversion (IOC) pattern to separate application configuration and dependency specifications from theactual application code.Spring框架Spring是一个开源框架, Spring是于2003 年兴起的一个轻量级的Java 开发框架, 由Rod Johnson创建。
框架结构外文翻译参考文献

框架结构外文翻译参考文献(文档含英文原文和中文翻译)译文:混凝土施工事项摘要根据一般承认的惯例看,巴基斯坦的混凝土结构建筑物在结构上的质量,效用和安全需要上都留下了很多值得关注的问题。
当2005 年10月8日发生在巴基斯坦北部的一个7.6级地震的时候,这些施工技术上的缺点袒露无遗了,破坏了数以千计建筑物、桥梁, 而且造成估计79,000人的死亡。
在巴基斯坦这种十分低质量的混凝土施工技术是造成这次极广破坏的主要原因。
关键字:混凝土浇筑养护建筑工艺混凝土浇筑若混凝土在地面上浇筑,地面应该具有足够的含水量以避免它吸收混凝土中的水分。
如果新混凝土将被浇筑在已经凝固的混凝土上或其旁边,已浇混凝土表面应该彻底清除干净,最好使用高压空气、高压水流或钢丝刷。
其表应潮湿,但不应有集水,应当在整个范围内刷上少量的水泥浆,然后立即铺上一层厚度为1/2in的砂浆。
新混凝土应铺筑在砂浆上或其旁边。
为减少混凝土在浇筑后由于运输导致的离析,混凝土的制备应该尽可能靠近最后浇筑的地方。
它应该分层浇筑以使每层可被均压实。
每层浇筑间隔的时间应该限制在能够保证新浇筑的混凝土与前面浇筑的有良好的结合。
当向较深的模板中浇筑混凝土时,就应该使用一根导管来限制混凝土的自由降落高度不超过3或4ft,以防止混凝土离析。
这种导管是由轻金属制成的管子,具有可调节的长度而且被连接到储存的混凝土的罐的底部。
当模板被浇筑满后,就可以抽出管节。
混凝土一浇筑完成,应立即用手提振捣器或机器振捣器进行捣密后就应该移走,否则就会发生骨料离析。
一般来说,振捣器不应该集中在先前提起的混凝土上。
振捣主要优点是它允许使用较干的混凝土,由于减少了混凝土的含水量,这种混凝土有较高的强度。
振捣混凝土的优点如下:1、水分的减少允许水泥和细集料的用量,因为这时需要较少的水泥浆。
2、较低的含水量可减少收缩和空隙。
3、较干的混凝土减少混凝土表面处理的费用。
4、机械振捣可代替3—8个手持振捣棒。
(完整版)哈佛分析框架外文文献及翻译

经营分析与估值克雷沙·G.帕利普保罗·M.希利摘自书籍“Business Analysis and Valuation”第五版第一章节1.简介本章的目的是勾勒出一个全面的财务报表分析框架。
因为财务报表提供给公共企业经济活动最广泛使用的数据,投资者和其他利益相关者依靠财务报告评估计划企业和管理绩效率。
各种各样的问题可以通过财务状况及经营分析解决,如下面的示例所示:一位证券分析师可能会对问:“我的公司有多好?这家公司是否符合我的期望?如果没有,为什么不呢?鉴于我对公司当前和未来业绩的评估,该公司的股票价值是多少?”一位信贷员可能需要问:“这家公司贷款给这家公司有什么贷款?公司管理其流动性如何?公司的经营风险是什么?公司的融资和股利政策所产生的附加风险是什么?“一位管理顾问可能会问:“公司经营的行业结构是什么?该策略通过在工业各个企业追求的是什么?不同企业在行业中的相对表现是什么?”公司经理可能会问:“我的公司是正确的估值的投资者吗?是我们在通信程序中有足够的投资者来促进这一过程?”财务报表分析是一项有价值的活动,当管理者在一个公司的战略和各种体制因素完成后,他们不可能完全披露这些信息。
在这一设置中,外部分析师试图通过分析财务报表数据来创建“中端信息”,从而获得有价值的关于该公司目前业绩和未来前景的展望。
了解财务报表分析所做的贡献,这是很重要的理解在资本市场的运作,财务报告的作用,形成财务报表制度的力量。
因此,我们首先简要说明这些力量,然后我们讨论的步骤,分析师必须执行,以提取信息的财务报表,并提供有价值的预测。
2.从经营活动到财务报表企业管理者负责从公司的环境中获取物理和财务资源,并利用它们为公司的投资者创造价值。
当公司在资本成本的超额投资时,就创造了价值。
管理者制定经营战略,实现这一目标,并通过业务活动实施。
企业的经营活动受其经济环境和经营战略的影响。
经济环境包括企业的产业、投入和产出的市场,以及公司经营的规章制度。
框架结构的抗震设计思路外文文献翻译

文献信息:文献标题:Frame Structure Anti-earthquake Design Way of Thinking (框架结构的抗震设计思路)国外作者:Theodore V.Galambos文献出处:《Journal of Constructional Concrete Research》,2000, 55:289-303 字数统计:英文4451单词,22990字符;中文5601汉字外文文献:Frame Structure Anti-earthquake Design Way of ThinkingAbstract Currently, the anti-earthquake norms all round the world almost adopt to a kind of way of thinking: The adoption presses the earthquake strong or weak of possible situation to divide the line earthquake cent area; According to everyplace the history occurrence of the area earthquake of covariance result or to geology structure of the history investigate to have to explicit statistics the meaning establish the sport peak in waterproof and quasi-ground value acceleration; Make use of again the reaction acceleration that the acceleration reaction composes different period; Get a design to use acceleration level through earthquake dint adjust met coefficient R. In the meantime, most nations all approve such point,establishing to defend the earthquake intensity level can take to use a different value, choosing to use to establish to defend the earthquake intensity level more and highly, the ductility request of the structure also more low, choose to use to establish to defend earthquake intensity level more and lowly, structure of ductility request more high. The structure ductility guarantee of precondition is the ductility of the member, pass again an effectively reasonable conjunction in adopting a series of measure guarantee member the foundation of the ductility, the structure system choice is reasonable in the meantime, the degree just distributes reasonable of under condition ability basic assurance structure of ductility.Keywords: frame structure; anti-earthquake design; design way of thinking1.Simple Review of Anti-earthquake Design Way of ThinkingThe development that constructs the structure anti- earthquake is along with people all the earthquake move with the structure characteristic of the understanding is continuously thorough but develop gradually, however, from is born up to now the history of a hundred years, have mostly several to develop a stage as follows:(1) Quiet dint stage: It first from a Japanese professor passed to harm to prognosticate the anti- earthquake design theories that put forward with the theories understanding at that time to the limited earthquake, being applicable to only just rigid body structure. It didn't think characteristic and the place difference to consider structure to the influence that constructs structure.(2) Respond the table stage: Along with vibrate to record of obtain and the development of the structure dynamics theories, the Biota professor of the United States put forward flexibility to respond the concept of the table in 1940, respond the table is list the freely flexible system, it was obtain of numerous earthquakes record of encourage, the structure period or respond of the relation, include the acceleration reaction table, the speed responded a table, moved to respond a table. It consider the motive characteristic of the structure, it still is the foundation that all countries norm design earthquake dint takes a value up to now. The calculation of the earthquake function dint usually use shears with the bottom and flaps a decomposition to respond a table a method, flapping a decomposition to respond a table a method of basic define: Suppose the building structure is the line flexibility more freedom degree system, making use principle of flap a decomposition and flap a type, it will solve a freedom degree the earthquake of the flexible system to respond to resolve for solve an independence of etc. the effect single freedom degree flexible system most the heavy earthquake respond. Then begging should in each function affect that flaps a type. At this time, according to consider the way dissimilarity of the earthquake function, adopt a different array, group method, order flexible system to many qualities of the flat surface vibration, it can use a SRSS method, it is according tosuppose the importation earthquake as steady random process, each of a flap reaction is independent mutually but deduce to get; For consider even-twists many qualities that the lotus connect to order flexible system, the adoption CQC method, it lies in with the main differentiation of the SRSS method: Suppose when flat surface vibrate each flap a type independent mutually, and each contribution that flap a type increased along with the frequency high but lower;But even-twist lotus connect hour each flap a frequency span very small, close together and higher flap the frequency of the type and may near to this relativity that will consider a dissimilarity to flap a very much, also have influence of turn round the weight and not necessarily increase along with the frequency high but lower, sometimes higher flap the influence possibility of the type big in lower flap the influence of the type, it will consider more influences that flap a type while comparing SRSS. The bottom shears the dint method in consideration of the special of the structure system to the simplification that flaps a decomposition to respond to compose a method, be the building height not big, took shearing to slice to transform as the lord and the quality to follow height to distribute more even structure with degree just, the structure vibration moved to respond usually with the first flapped a type for lord, and when the first flapped a type to near to in the straight line, can flap a decomposition method simplification to shear the dint method calculation formula for the basic bottom. The level earthquake function that each quality that this basic formula calculation get order can better reflection just degree bigger structure, but when structure the basic period was long, the place characteristic period to compare with hour, the calculation income coping earthquake function be partial to small. of course , the Anti-earthquake Norm provision, be the structure basic period more than 1.4 place characteristic period, at coping additional level earthquake function.(3)the motive theories stage: Along with move understanding and comprehend to the earthquake of deepen continuously, know to some shortage of the reaction table, such as to the earthquake move hold of influence consideration not week, and the exaltation of the calculator function, make the motive method develop gradually, its essence solves a square distance of motive directly, but because of earthquake theground sport acceleration is very irregular, it can't beg for differential calculus square distance, it shuts to match a solution, so adopt number integral calculus method more. Usual way of doing is carry on a continuous cent a segment a processing towards having already record of the earthquake wave, each data all see do the constant, then the function get to structure up, pass an equilibrium and square distance of motive to beg at the moment of the acceleration, speed, move reaction, moving with ex- the acceleration, speed, the segment to carry on folding to add immediately after folding the result for add as the beginning that descends at that time a segment to start a data, pushing according to this kind, end beg structure at the give for low week again and again the earthquake wave under of the acceleration, speed and move the dint reaction variety process.(4) At American Northridge earthquake in 1994 and Japanese Kobe earthquake in 1995 after, the beautiful day scholar put forward again according to the anti- earthquake design method of behavior, it was during the period of usage to make the building structure satisfy various requests that used function according to the basic thought of behavior. Tradition according to the design method dissimilarity of the dint, adjudicate to the structure function mainly is according to move standard, move index sign to come with the different to the structure function to carry on a different control. But descend structure because of the big earthquake of not- flexible transform hard and accurate estimate of, make to can stay around according to the design method of behavior theoretically. But put forward its aggressive meaning to have 2:00 at least:a. Emphasize the system and the society of the earthquake engineering;b. The part that knows an original anti- earthquake to design norm is unsuited to reasonableness.Conduct and actions according to the foundation of the function anti- earthquake design, should to the particular level earthquake function of a certain covariance meaning under of the structure move, the speed and acceleration carry on accurate valuation, should also have a reasonable of valuation method with available valuation tool. It is exactly because of this purpose, put forward and developed the Pushover method and ability to compose a method. The basic way of thinking of the Pushovermethod is an adoption the quiet dint add to carry, supposing the side of the some penny cloth form toward lotus to carry a function on the structure, adding to carry gradually until attain the structure control point target to move or the structure break, getting the level side of the control point to move to shear the dint relation curve with substrate thus, evaluating in order to the anti-vibration ability of the structure. The Pushover method depends on to distribute a form and play the plasticity reaction table target to move to really settle in the side force.2.Basic Way of Thinking of Frame Structure Anti-earthquake Design—ductility StandardAfter the flexibility respond table put forward, the people's detection computes to gain from here of the structure respond with the actual earthquake the breakage phenomenon of the structure contain certain antinomy, mainly is press the flexibility reaction table to calculate of the structure responded the acceleration as habitual to design the earthquake dint to take to be worth big quite a few at that time doubly, and took to settle according to the habitual of the function of the design earthquake dint descends the house structure of design, the harm of the structure system wasn't serious in the earthquake.60's last century, the New mark passed to start to the beginning of different period just degree homology of the single freedom degree the system carried on analysis under the situation that many waves input, put forward etc. moved the principle and etc. energy principle, and put forward the concept of the structure ductility. Studied single and free system to accept defeat the level and flexibility thoroughly again from the relation of flapped the biggest not- flexible motive in the period and structure to respond afterward, this be customarily say of the theories of the R-μ -T effect. Passing these researches, announcing to public the ductility ability and plasticity to consume an ability is a structure Be taking to use to accept defeat level under not high circumstance, at big earthquake under the structure doesn't take place severity to break and doesn't don't tumble down of assurance. Arrive here, concerning the design earthquake dint's taking the basic problem of the value size have to arrive understanding definitely, be the anti- earthquake the earthquake dinttake a value of the size isn't a number of assurance, but with the structure ductility function and consume the ability mechanism related quantity value. Here what to need to be explain BE, designed the earthquake dint to take a value to resolve a problem only, but to the structure ductility function guarantee of the measure have to can also promise, this will at underneath a section discuss.Currently, the anti- earthquake norms all round the world almost adopts so a kind of way of thinking: The adoption presses the earthquake strong or weak of possible situation to divide the line earthquake cent area; According to everyplace the history occurrence of the area earthquake of covariance result or to geology structure of the history investigate to have to explicit statistics the meaning establish the sport peak value in waterproof and quasi- ground value acceleration; Make use of again the reaction acceleration that the acceleration reaction composes different period to descend structure to; get a design to use acceleration level through the earthquake dint adjustment coefficient R. In the meantime, most nations all approve such standpoint, establishing to defend the earthquake intensity level can take to use a different value, choosing to use to establish to defend the earthquake intensity level more and highly, the ductility request of the structure also more low, choose to use to establish to defend the earthquake intensity level more and lowly, structure of ductility request more high. The structure ductility guarantee of precondition is the ductility of the member, pass again an effectively reasonable conjunction in adopting a series of measure guarantee member the foundation of the ductility, the structure system choice is reasonable in the meantime, the degree just distributes reasonable of under condition ability basic assurance structure of ductility.Underneath this kind of discusses the our country anti- earthquake norm mostly way of thinking, the current Chinese norm didn't adopt a variety to establish to defend the earthquake intensity level to take to use, but don’ Ted add a distinction of unify an adoption of the earthquake dint adjustment coefficient R=1/0.35;In the meantime, mostly according to establish a dissimilarity of defend the earthquake intensity, divide the line the different anti- earthquake grade, fix attention on in establish to defend earthquake intensity differently, adopt the anti- earthquake measure of the differentassurance ductility. Very obvious here exist a misunderstanding of concept, also be according to the theories of the R-μ-T effect, the little more than earthquake dint adjustment coefficient R=1/0.35, should give the same ductility guarantee measure to the structure, but the Chinese norm adopt the different ductility guarantee measure, along with anti- earthquake the exaltation of the grade, ductility guarantee the ability correspond to strengthen. This kind of usefulness of the way of doing under way and not the line motive respond of verification, can describe so as a result mostly: For the district of 8 degrees 0.3 g and 9 degrees 0.4 g, because of correspond of the anti- earthquake grade is higher, the measure of the guarantee ductility is also stronger, so generally and more safe; And for the district of 6 degrees 0.05 g and 7 degrees 0.1 g, gain from here to of the level earthquake effect be partial to small, the general lotus carries an array, group is carried the control function by the gravity lotus, although to should of the measure of the guarantee ductility isn't very strong, can also guarantee structure generally under the big earthquake of not- flexible transform of function; But to the district of 7 degrees 0.15 g and 8 degrees 0.2 g, circumstance another the person worry, because of at the lotus carry an array, group, the earthquake function can have generally control function, but correspond measure of guarantee the ductility and be partial to weak, so difficult don't need to exist certain potential safety hazard to suffer from. See again other national earthquake dint adjustment coefficient R to choose to use, in order to have kept concrete understanding of view:The earthquake dint adjustment coefficient of all countries norm provision3.Ability Design MethodTop a part emphasized to discuss the design earthquake dint to take the problem of the value, but wanted to promise structure under the big earthquake of function, also need to establish the valid anti- earthquake measure, make the structure really have need of keep vertical loading under the dint condition not- flexible transform an ability, this be the so-called ability design method.Ability design method from New Zealand the reinforced concrete anti- earthquake expert scholars such as the T. Parlay and the R. Park etc. development with initiate, main way of thinking is to the member occasionally member dissimilarity inside the piece is subjected to the dint form of the loading ability differ of control, promise the reinforced concrete structure formation the beam swing joint organization and ductility bigger is cut noodles to be subjected to the dint breakage appearance, make the structure have to play plasticity to transform function enough, promise big earthquake hour have an enough ability to consume to spread function, avoid creation brittleness to break and appear disadvantageous of organization form. The key of the ability design method is the anti- earthquake design that leads the control concept into structure, there is the leading formation of the purpose to the beneficial breakage mechanism is to the structure and break mode, avoid not reasonable of the structure break appearance, and try assurance to anticipate to break part to play plasticity to transform an ability.The ability design method mainly passes the following three kinds of measure to give assurance:1. Enlarge pillar opposite in the anti- of the beam-curved ability, artificial of leading of the structure swing joint part.2. Raise opposite in is cut the noodles loading dint of the anti- shear ability, avoiding appearing non- ductility to shear to slice breakage.3. To the part that appears the plasticity swing probably, the adoption corresponds of structure measure, assurance necessity of not- flexible transform function.First, the reasonable part of the swing joint carry on a discussion, all countriesmostly of the way of thinking inclines toward to make the project that the beam carries first to carry to appear in the pillar about and all. This kind of swing joint project has a following advantage: The ductility of the beam is easy to a control, and under general circumstance compare pillar of the ductility is big; The whole plasticity of the beam swing joint ratio pillar swing joint formation transform small; The plasticity of the beam swing joint organization formation transform more stable. There are also two kinds of different design methods while admit the premise of have the initiative the formation beam swing joint, a kind of from is a representative New Zealand of, incline toward the formation ideal beam swing joint organization, be promise the beam carries to appear the plasticity swing, but in addition to first floor, the post all doesn't appear the plasticity swing, at this time to in addition to the first floor pillar give post opposite compare bigger and super and strong coefficient(probably 2.0) in the beam, the advantage is a post(in addition to first floor) and doesn't need to be carry on to go together with hoop complicatedly at this time, because of adopt such coefficient can promise a swing joint very explicit. But is exactly because this kind of design method pursues the ideal beam swing joint organization to cause the first floor post compare weaker, the possibility for throng will be a swing joint, the plasticity that correspond and then have to adopt the structure measure to promise this part transforms function. In the meantime, such as if the first floor the influence of the swing joint upon the structure will compare greatly, once pressing and mating because structural whole tumble down, this has to be given guarantee up from the structure, increasing a structure of difficulty. Another project includes total body, Chinese etc. in the United States, Europe, this kind of project leading structure pillar swing joint the night appears in the beam swing joint, unlimited make the emergence of the swing joint in the meantime, but request structure and do not become the layer side to move structure, at this time to post of super go together with coefficient to compare with to request New Zealand of want to be small, goes together with the project that the stirrup takes in to control to the post adoption in the meantime. BE super to go together with coefficient to really settle problem comparison complications to the post adoption in fact: The beam carries thesuper influence for go together with for construct; The beam carries the plasticity swing to appear inside the dint is heavy to distribute of influence; Before accept defeat of the not- flexible characteristic may make the post bending moment physically big get in the flexibility analysis of bending moment ;The indetermination factor that the material difference bring; Growth of the structure not- flexible characteristic cause the influence etc. that the structure motive characteristic variety bring. According to the request of the ability design, the plastic hinge that shears the dint wall appears generally in the bottom of the wall limb. The joining beam shear the loading dint and ductility that the loading dint and ductility and entrance to cave of the dint wall connect beam contain very great relation, designing generally and possibly weak connect beam, the leading that has intention to know connects beam at earthquake accept defeat first, then is the bottom wall to accept defeat, also be anticipate the area of plastic hinge to accept defeat.Avoided appearing to shear reason of slice the breakage early easy, be because of shearing to slice to break to belong to the brittleness breakage, disadvantage in promise the ductility of the structure, promise of way be according to the dissimilarity of the anti- earthquake grade to all beams, pillars, wall etc. the adoption is opposite to bend in the anti- of different super go together with coefficient.The basic request that the anti- earthquake anti- shear is before the beam carry plastic hinge that big epicenter need turn to move and don't take place to shear to slice breakage, this sheared concept difference with the non- anti- earthquake anti-.For various different processing methods that the structure anti- of the member shears mechanism and the our country norm, there is the necessity elucidation here once. Beam: When anti- shake because of low week again and again the function made the beam appear to cross an inclined fracture, fissure, the inclined fracture, fissure distributed an anti- of come to a decision the anti- earthquake to shear the ability ratio not an anti- earthquake to have to descend, reason: The anti- shake of shear to slice to break occurrence after the end long tendon accept defeat, the fracture, fissure compare at this time greatly; The harm that crosses the emergence of the fracture, fissure to the concrete is more serious; The enlargement beam carried the number of the negativebending moment when anti- shake, cause bigger sheared the dint value to appear under the beam to carry, sprinkle plank now because of descending to carry to have no, break more easily. But at this time the function and function for non- anti- to shake of the stirrup differ only a few, in the norm to the consideration of this disadvantageous function is to adopt to resist to shear formula in to the concrete item 0.6 of fold to reduce, in the meantime, in order not to non- ductility of inclined break bad, while adopting to shake than the non- anti- more scathing restriction measure, cut noodles to shear the dint design value ratio non- anti- earthquake multiply 0.8 of fold and reduce coefficient. Pillar: It resist earthquake in the norm the anti- of the pillar shear the processing principle of the formula similar, also is adopt to the concrete item 0.6 of fold and reduce coefficient, adopt more scathing measure to prevent from equally inclined break bad, cut noodles to shear the dint design value ratio non- anti- earthquake multiply 0.8 of fold and reduce coefficient. But because of under general circumstance, the stalk pressure comparison of the pillar is big, this kind of pressure shears function to be partial to the anti- of the member after appearing the plastic hinge to the pillar emollient, according to this kind of way of thinking, pillar the adoption fold to reduce with beam similarly to seem to be not greatly reasonable. Wall: When the anti- shake, there is almost no related on trial data in domestic, is an adoption only the earthquake is to the non- anti- of the anti- sheared formula to adopt to the concrete item and the reinforcing bar items 0.8 of fold and reduce coefficient, in the meantime, in bar of and inclined break bad, adoption the restriction shear a way of press the ratio, cut noodles to shear the dint design value ratio non- anti- earthquake multiply 0.8 of fold and reduce coefficient. What to need to be explaining BE, under general circumstance, the part that shears the dint wall anti- to shear a problem probably is a lower part are a few floors. Node: The main acceptance shears the dint member, the node shears dint mainly is depend on the truss organization, inclined press pole organization, the stirrup of the stipulation effect three organizations or path to bear. The truss organization mainly is resist the reinforcing bar lord to pull should dint, inclined press the pole organization mainly is the lord that resists the concrete and the reinforcing bar creation to press should dint, the stipulation effect of thestirrup then strengthens the anti- of the concrete to shear ability. Along with the node concrete inside the area not- line development, the truss the function of the structure lets up continuously, and then both of function but be strengthening continuously. Therefore, the main target of the node anti- earthquake is under the situation that be subjected to dint again and again, pass to strengthen inclined press the pole organization and the stirrup to control an effect to avoid the core area concrete inclined to press thus a diplomatic corps to order at attain to anticipate of the big earthquake respond before do not take place to shear to slice breakage.After shearing the discussion of mechanism to the above anti-earthquake, can be do with the function of the beam stirrup to tally up as follows: The first obvious function is to used for an anti- to shear; The second function controls concrete, this to guarantee the structure ductility contain count for much function, can also say literally here the obstacle that once high and strong concrete meet when used for anti- earthquake, this is related with the material of the high and strong concrete first, strength more high concrete more frailty, its should attain in the dint contingency relation biggest press should the contingency of the dint is smaller, this makes the design become the ductility member a difficulty with very great formation, is more high because of the strength of the concrete in the meantime, the stirrup rises the effect of the stipulation more bad, also can't the extreme limit of the enough valid exaltation concrete press a contingency, so cause to adopt the ductility of the structure member of the high and strong concrete hard get a guarantee; The third function is the stipulation function that carries to the beam lengthways reinforcing bar, prevent forming lengthways reinforcing bar lose steady, this has something to do with the special material of the reinforcing bar.中文译文:框架结构的抗震设计思路摘要目前,世界各国的抗震规范都采用这种思路:按可遇地震的强弱划分地震分区;根据各地区的历史发生地震的统计或对地质构造的考察得出设防水准地面的运动峰值加速度;再利用加速度反应谱给出不同周期下结构的反应加速度;通过地震力调整系数R得到设计加速度水准。
毕业设计外文文献及翻译

毕业设计外文文献及翻译毕业设计外文文献及翻译在进行毕业设计时,外文文献的阅读和翻译是一个非常重要的环节。
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在翻译过程中,我们要尽量保持原文的意思和风格,避免出现歧义和误解。
同时,要注意语法和词汇的准确性,确保翻译的流畅和自然。
在翻译时,我们可以先整体理解文献的主旨和结构,然后逐句逐段进行翻译。
在遇到难以理解或翻译的地方,可以查阅相关的参考资料和词典,提高翻译的准确性和质量。
在翻译外文文献时,我们还可以借助翻译软件和在线翻译平台,提高翻译的效率和准确性。
除了阅读和翻译外文文献,我们还可以通过写作和讨论来加深对外文文献的理解和应用。
在写作过程中,我们可以将阅读和翻译的内容整理成文章的结构和逻辑,形成自己的思路和观点。
通过讨论和交流,我们可以与他人分享自己的理解和观点,获取更多的反馈和建议。
通过写作和讨论,我们可以将外文文献的内容转化为自己的知识和理解,为自己的毕业设计提供有力的支持和论证。
总之,毕业设计外文文献的阅读和翻译是一个重要的环节。
通过阅读外文文献,我们可以了解最新的研究进展和学术观点,拓宽自己的知识视野;通过翻译外文文献,我们可以将这些宝贵的资料转化为自己的知识和理解,为自己的毕业设计提供有力的支持。
毕业设计论文外文文献翻译

xxxx大学xxx学院毕业设计(论文)外文文献翻译系部xxxx专业xxxx学生姓名xxxx 学号xxxx指导教师xxxx 职称xxxx2013年3 月Introducing the Spring FrameworkThe Spring Framework: a popular open source application framework that addresses many of the issues outlined in this book. This chapter will introduce the basic ideas of Spring and dis-cuss the central “bean factory” lightweight Inversion-of-Control (IoC) container in detail.Spring makes it particularly easy to implement lightweight, yet extensible, J2EE archi-tectures. It provides an out-of-the-box implementation of the fundamental architectural building blocks we recommend. Spring provides a consistent way of structuring your applications, and provides numerous middle tier features that can make J2EE development significantly easier and more flexible than in traditional approaches.The basic motivations for Spring are:To address areas not well served by other frameworks. There are numerous good solutions to specific areas of J2EE infrastructure: web frameworks, persistence solutions, remoting tools, and so on. However, integrating these tools into a comprehensive architecture can involve significant effort, and can become a burden. Spring aims to provide an end-to-end solution, integrating spe-cialized frameworks into a coherent overall infrastructure. Spring also addresses some areas that other frameworks don’t. For example, few frameworks address generic transaction management, data access object implementation, and gluing all those things together into an application, while still allowing for best-of-breed choice in each area. Hence we term Spring an application framework, rather than a web framework, IoC or AOP framework, or even middle tier framework.To allow for easy adoption. A framework should be cleanly layered, allowing the use of indi-vidual features without imposing a whole worldview on the application. Many Spring features, such as the JDBC abstraction layer or Hibernate integration, can be used in a library style or as part of the Spring end-to-end solution.To deliver ease of use. As we’ve noted, J2EE out of the box is relatively hard to use to solve many common problems. A good infrastructure framework should make simple tasks simple to achieve, without forcing tradeoffs for future complex requirements (like distributed transactions) on the application developer. It should allow developers to leverage J2EE services such as JTA where appropriate, but to avoid dependence on them in cases when they are unnecessarily complex.To make it easier to apply best practices. Spring aims to reduce the cost of adhering to best practices such as programming to interfaces, rather than classes, almost to zero. However, it leaves the choice of architectural style to the developer.Non-invasiveness. Application objects should have minimal dependence on the framework. If leveraging a specific Spring feature, an object should depend only on that particular feature, whether by implementing a callback interface or using the framework as a class library. IoC and AOP are the key enabling technologies for avoiding framework dependence.Consistent configuration. A good infrastructure framework should keep application configuration flexible and consistent, avoiding the need for custom singletons and factories. A single style should be applicable to all configuration needs, from the middle tier to web controllers.Ease of testing. Testing either whole applications or individual application classes in unit tests should be as easy as possible. Replacing resources or application objects with mock objects should be straightforward.To allow for extensibility. Because Spring is itself based on interfaces, rather than classes, it is easy to extend or customize it. Many Spring components use strategy interfaces, allowing easy customization.A Layered Application FrameworkChapter 6 introduced the Spring Framework as a lightweight container, competing with IoC containers such as PicoContainer. While the Spring lightweight container for JavaBeans is a core concept, this is just the foundation for a solution for all middleware layers.Basic Building Blockspring is a full-featured application framework that can be leveraged at many levels. It consists of multi-ple sub-frameworks that are fairly independent but still integrate closely into a one-stop shop, if desired. The key areas are:Bean factory. The Spring lightweight IoC container, capable of configuring and wiring up Java-Beans and most plain Java objects, removing the need for custom singletons and ad hoc configura-tion. Various out-of-the-box implementations include an XML-based bean factory. The lightweight IoC container and its Dependency Injection capabilities will be the main focus of this chapter.Application context. A Spring application context extends the bean factory concept by adding support for message sources and resource loading, and providing hooks into existing environ-ments. Various out-of-the-box implementations include standalone application contexts and an XML-based web application context.AOP framework. The Spring AOP framework provides AOP support for method interception on any class managed by a Spring lightweight container.It supports easy proxying of beans in a bean factory, seamlessly weaving in interceptors and other advice at runtime. Chapter 8 dis-cusses the Spring AOP framework in detail. The main use of the Spring AOP framework is to provide declarative enterprise services for POJOs.Auto-proxying. Spring provides a higher level of abstraction over the AOP framework and low-level services, which offers similar ease-of-use to .NET within a J2EE context. In particular, the provision of declarative enterprise services can be driven by source-level metadata.Transaction management. Spring provides a generic transaction management infrastructure, with pluggable transaction strategies (such as JTA and JDBC) and various means for demarcat-ing transactions in applications. Chapter 9 discusses its rationale and the power and flexibility that it offers.DAO abstraction. Spring defines a set of generic data access exceptions that can be used for cre-ating generic DAO interfaces that throw meaningful exceptions independent of the underlying persistence mechanism. Chapter 10 illustrates the Spring support for DAOs in more detail, examining JDBC, JDO, and Hibernate as implementation strategies.JDBC support. Spring offers two levels of JDBC abstraction that significantly ease the effort of writing JDBC-based DAOs: the org.springframework.jdbc.core package (a template/callback approach) and the org.springframework.jdbc.object package (modeling RDBMS operations as reusable objects). Using the Spring JDBC packages can deliver much greater pro-ductivity and eliminate the potential for common errors such as leaked connections, compared with direct use of JDBC. The Spring JDBC abstraction integrates with the transaction and DAO abstractions.Integration with O/R mapping tools. Spring provides support classesfor O/R Mapping tools like Hibernate, JDO, and iBATIS Database Layer to simplify resource setup, acquisition, and release, and to integrate with the overall transaction and DAO abstractions. These integration packages allow applications to dispense with custom ThreadLocal sessions and native transac-tion handling, regardless of the underlying O/R mapping approach they work with.Web MVC framework. Spring provides a clean implementation of web MVC, consistent with the JavaBean configuration approach. The Spring web framework enables web controllers to be configured within an IoC container, eliminating the need to write any custom code to access business layer services. It provides a generic DispatcherServlet and out-of-the-box controller classes for command and form handling. Request-to-controller mapping, view resolution, locale resolution and other important services are all pluggable, making the framework highly extensi-ble. The web framework is designed to work not only with JSP, but with any view technology, such as Velocity—without the need for additional bridges. Chapter 13 discusses web tier design and the Spring web MVC framework in detail.Remoting support. Spring provides a thin abstraction layer for accessing remote services without hard-coded lookups, and for exposing Spring-managed application beans as remote services. Out-of-the-box support is inc luded for RMI, Caucho’s Hessian and Burlap web service protocols, and WSDL Web Services via JAX-RPC. Chapter 11 discusses lightweight remoting.While Spring addresses areas as diverse as transaction management and web MVC, it uses a consistent approach everywhere. Once you have learned the basic configuration style, you will be able to apply it in many areas. Resources, middle tier objects, and web components are all set up using the same bean configuration mechanism. You can combine your entireconfiguration in one single bean definition file or split it by application modules or layers; the choice is up to you as the application developer. There is no need for diverse configuration files in a variety of formats, spread out across the application.Spring on J2EEAlthough many parts of Spring can be used in any kind of Java environment, it is primarily a J2EE application framework. For example, there are convenience classes for linking JNDI resources into a bean factory, such as JDBC DataSources and EJBs, and integration with JTA for distributed transaction management. In most cases, application objects do not need to work with J2EE APIs directly, improving reusability and meaning that there is no need to write verbose, hard-to-test, JNDI lookups.Thus Spring allows application code to seamlessly integrate into a J2EE environment without being unnecessarily tied to it. You can build upon J2EE services where it makes sense for your application, and choose lighter-weight solutions if there are no complex requirements. For example, you need to use JTA as transaction strategy only if you face distributed transaction requirements. For a single database, there are alternative strategies that do not depend on a J2EE container. Switching between those transac-tion strategies is merely a matter of configuration; Spring’s consistent abstraction avoids any need to change application code.Spring offers support for accessing EJBs. This is an important feature (and relevant even in a book on “J2EE without EJB”) because the u se of dynamic proxies as codeless client-side business delegates means that Spring can make using a local stateless session EJB an implementation-level, rather than a fundamen-tal architectural, choice.Thus if you want to use EJB, you can within a consistent architecture; however, you do not need to make EJB the cornerstone of your architecture. This Spring feature can make devel-oping EJB applications significantly faster, because there is no need to write custom code in service loca-tors or business delegates. Testing EJB client code is also much easier, because it only depends on the EJB’s Business Methods interface (which is not EJB-specific), not on JNDI or the EJB API.Spring also provides support for implementing EJBs, in the form of convenience superclasses for EJB implementation classes, which load a Spring lightweight container based on an environment variable specified in the ejb-jar.xml deployment descriptor. This is a powerful and convenient way of imple-menting SLSBs or MDBs that are facades for fine-grained POJOs: a best practice if you do choose to implement an EJB application. Using this Spring feature does not conflict with EJB in any way—it merely simplifies following good practice.Introducing the Spring FrameworkThe main aim of Spring is to make J2EE easier to use and promote good programming practice. It does not reinvent the wheel; thus you’ll find no logging packages in Spring, no connection pools, no distributed transaction coordinator. All these features are provided by other open source projects—such as Jakarta Commons Logging (which Spring uses for all its log output), Jakarta Commons DBCP (which can be used as local DataSource), and ObjectWeb JOTM (which can be used as transaction manager)—or by your J2EE application server. For the same reason, Spring doesn’t provide an O/R mapping layer: There are good solutions for this problem area, such as Hibernate and JDO.Spring does aim to make existing technologies easier to use. For example, although Spring is not in the business of low-level transactioncoordination, it does provide an abstraction layer over JTA or any other transaction strategy. Spring is also popular as middle tier infrastructure for Hibernate, because it provides solutions to many common issues like SessionFactory setup, ThreadLocal sessions, and exception handling. With the Spring HibernateTemplate class, implementation methods of Hibernate DAOs can be reduced to one-liners while properly participating in transactions.The Spring Framework does not aim to replace J2EE middle tier services as a whole. It is an application framework that makes accessing low-level J2EE container ser-vices easier. Furthermore, it offers lightweight alternatives for certain J2EE services in some scenarios, such as a JDBC-based transaction strategy instead of JTA when just working with a single database. Essentially, Spring enables you to write appli-cations that scale down as well as up.Spring for Web ApplicationsA typical usage of Spring in a J2EE environment is to serve as backbone for the logical middle tier of a J2EE web application. Spring provides a web application context concept, a powerful lightweight IoC container that seamlessly adapts to a web environment: It can be accessed from any kind of web tier, whether Struts, WebWork, Tapestry, JSF, Spring web MVC, or a custom solution.The following code shows a typical example of such a web application context. In a typical Spring web app, an applicationContext.xml file will reside in the WEB-INF directory, containing bean defini-tions according to the “spring-beans” DTD. In such a bean definition XML file, business objects and resources are defined, for example, a “myDataSource” bean, a “myInventoryManager” bean, and a “myProductManager” bean. Spring takes care of their configuration, their wiring up, and their lifecycle.<beans><bean id=”myDataSource” class=”org.springframework.jdbc. datasource.DriverManagerDataSource”><property name=”driverClassName”> <value>com.mysql.jdbc.Driver</value></property> <property name=”url”><value>jdbc:mysql:myds</value></property></bean><bean id=”myInventoryManager” class=”ebusiness.DefaultInventoryManager”> <property name=”dataSource”><ref bean=”myDataSource”/> </property></bean><bean id=”myProductManager” class=”ebusiness.DefaultProductManage r”><property name=”inventoryManager”><ref bean=”myInventoryManager”/> </property><property name=”retrieveCurrentStock”> <value>true</value></property></bean></beans>By default, all such beans have “singleton” scope: one instance per context. The “myInventoryManager” bean will automatically be wired up with the defined DataSource, while “myProductManager” will in turn receive a reference to the “myInventoryManager” bean. Those objects (traditionally called “beans” in Spring terminology) need to expos e only the corresponding bean properties or constructor arguments (as you’ll see later in this chapter); they do not have to perform any custom lookups.A root web application context will be loaded by a ContextLoaderListener that is defined in web.xml as follows:<web-app><listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>...</web-app>After initialization of the web app, the root web application context will be available as a ServletContext attribute to the whole web application, in the usual manner. It can be retrieved from there easily via fetching the corresponding attribute, or via a convenience method in org.springframework.web. context.support.WebApplicationContextUtils. This means that the application context will be available in any web resource with access to the ServletContext, like a Servlet, Filter, JSP, or Struts Action, as follows:WebApplicationContext wac = WebApplicationContextUtils.getWebApplicationContext(servletContext);The Spring web MVC framework allows web controllers to be defined as JavaBeans in child application contexts, one per dispatcher servlet. Such controllers can express dependencies on beans in the root application context via simple bean references. Therefore, typical Spring web MVC applications never need to perform a manual lookup of an application context or bean factory, or do any other form of lookup.Neither do other client objects that are managed by an application context themselves: They can receive collaborating objects as bean references.The Core Bean FactoryIn the previous section, we have seen a typical usage of the Spring IoC container in a web environment: The provided convenience classes allow for seamless integration without having to worry about low-level container details. Nevertheless, it does help to look at the inner workings to understand how Spring manages the container. Therefore, we will now look at the Spring bean container in more detail, starting at the lowest building block: the bean factory. Later, we’ll continue with resource setup and details on the application context concept.One of the main incentives for a lightweight container is to dispense with the multitude of custom facto-ries and singletons often found in J2EE applications. The Spring bean factory provides one consistent way to set up any number of application objects, whether coarse-grained components or fine-grained busi-ness objects. Applying reflection and Dependency Injection, the bean factory can host components that do not need to be aware of Spring at all. Hence we call Spring a non-invasive application framework.Fundamental InterfacesThe fundamental lightweight container interface is org.springframework.beans.factory.Bean Factory. This is a simple interface, which is easy to implement directly in the unlikely case that none of the implementations provided with Spring suffices. The BeanFactory interface offers two getBean() methods for looking up bean instances by String name, with the option to check for a required type (and throw an exception if there is a type mismatch).public interface BeanFactory {Object getBean(String name) throws BeansException;Object getBean(String name, Class requiredType) throws BeansException;boolean containsBean(String name);boolean isSingleton(String name) throws NoSuchBeanDefinitionException;String[] getAliases(String name) throws NoSuchBeanDefinitionException;}The isSingleton() method allows calling code to check whether the specified name represents a sin-gleton or prototype bean definition. In the case of a singleton bean, all calls to the getBean() method will return the same object instance. In the case of a prototype bean, each call to getBean() returns an inde-pendent object instance, configured identically.The getAliases() method will return alias names defined for the given bean name, if any. This mecha-nism is used to provide more descriptive alternative names for beans than are permitted in certain bean factory storage representations, such as XML id attributes.The methods in most BeanFactory implementations are aware of a hierarchy that the implementation may be part of. If a bean is not foundin the current factory, the parent factory will be asked, up until the root factory. From the point of view of a caller, all factories in such a hierarchy will appear to be merged into one. Bean definitions in ancestor contexts are visible to descendant contexts, but not the reverse.All exceptions thrown by the BeanFactory interface and sub-interfaces extend org.springframework. beans.BeansException, and are unchecked. This reflects the fact that low-level configuration prob-lems are not usually recoverable: Hence, application developers can choose to write code to recover from such failures if they wish to, but should not be forced to write code in the majority of cases where config-uration failure is fatal.Most implementations of the BeanFactory interface do not merely provide a registry of objects by name; they provide rich support for configuring those objects using IoC. For example, they manage dependen-cies between managed objects, as well as simple properties. In the next section, we’ll look at how such configuration can be expressed in a simple and intuitive XML structure.The sub-interface org.springframework.beans.factory.ListableBeanFactory supports listing beans in a factory. It provides methods to retrieve the number of beans defined, the names of all beans, and the names of beans that are instances of a given type:public interface ListableBeanFactory extends BeanFactory {int getBeanDefinitionCount();String[] getBeanDefinitionNames();String[] getBeanDefinitionNames(Class type);boolean containsBeanDefinition(String name);Map getBeansOfType(Class type, boolean includePrototypes,boolean includeFactoryBeans) throws BeansException}The ability to obtain such information about the objects managed by a ListableBeanFactory can be used to implement objects that work with a set of other objects known only at runtime.In contrast to the BeanFactory interface, the methods in ListableBeanFactory apply to the current factory instance and do not take account of a hierarchy that the factory may be part of. The org.spring framework.beans.factory.BeanFactoryUtils class provides analogous methods that traverse an entire factory hierarchy.There are various ways to leverage a Spring bean factory, ranging from simple bean configuration to J2EE resource integration and AOP proxy generation. The bean factory is the central, consistent way of setting up any kind of application objects in Spring, whether DAOs, business objects, or web controllers. Note that application objects seldom need to work with the BeanFactory interface directly, but are usu-ally configured and wired by a factory without the need for any Spring-specific code.For standalone usage, the Spring distribution provides a tiny spring-core.jar file that can be embed-ded in any kind of application. Its only third-party dependency beyond J2SE 1.3 (plus JAXP for XML parsing) is the Jakarta Commons Logging API.The bean factory is the core of Spring and the foundation for many other services that the framework offers. Nevertheless, the bean factory can easily be used stan-dalone if no other Spring services are required.Derivative:networkSpring 框架简介Spring框架:这是一个流行的开源应用框架,它可以解决很多问题。
土木工程框架结构设计开题报告文献综述外文翻译

毕业设计(论文)开题报告(含文献综述、外文翻译)题目南凯信办公楼设计姓名学号专业班级土木工程(结构方向)1班指导教师学院土木建筑工程学院开题日期 2013年3月10日文献综述框架结构设计1.前言ﻫ随着社会的发展,钢筋混凝土框架结构的建筑物越来越普遍.由于钢筋混凝土结构与砌体结构相比较具有承载力大、结构自重轻、抗震性能好、建造的工业化程度高等优点;与钢结构相比又具有造价低、材料来源广泛、耐火性好、结构刚度大、使用维修费用低等优点。
因此,在我国钢筋混凝土结构是多层框架最常用的结构型式。
例如:我国20世纪60年代的北京民航办公大楼是装配整体式框架结构;80年代建造的北京长城饭店是现浇延性框架结构。
2.框架结构的优缺点ﻫ框架结构体系是由梁、板、柱组成。
优点:建筑平面布置灵活,可以做成有较大空间的会议室、车间、教室等。
需要时还可以隔断分隔成小房间,或拆除隔断变成大房间,因而使用非常灵活。
外墙用非承重构件,可以使立面设计灵活多变。
使用轻质隔墙和外墙,还可以大大降低结构自重,节省材料。
缺点:框架结构的缺点也很明显,因为框架结构的抗侧刚度主要取决于梁、柱的截面尺寸,通常梁、柱截面惯性矩小,侧向变形较大,因此限制了框架结构的使用高度。
在我国目前情况下,框架结构建造高度以15~20层以下为宜。
3.综上所述,在高度不大的结构中框架结构是一种比较好的结构体系。
ﻫ框架结构布置框架结构在进行平面布置时,首先要确定柱网,柱网的尺寸必须满足建筑使用和结构受力合理要求,同时还有考虑施工方便和经济因素。
柱网的开间及进深。
可设计成大柱网和小柱网,在抗震结构中,过大的柱网将给实现延性框架增加一定的困难。
承重框架及抗侧力框架。
承重框架是指直接支承楼板传来的竖向荷载的框架,根据楼板中梁板布置的不同一般可分为横向承重、纵向承重和双重承重等几种布置方式。
由于风及地震可能从任何一方向作用,所以不管横向还是纵向都是抗侧力框架。
抗侧力框架必须做成刚接框架,不得采用横向为框架、纵向为铰接排架的结构体系。
同济大学土木工程本科毕业设计-框架结构设计翻译(译文)

d0 4
0.9743 nt
2
这里, 是每英寸的螺栓数。 R3.1 ACI 318 附录 D 要求用于地震作用下的锚栓,能抵抗模拟的循环地震作用。 经验表明受到典型地震作用的钢筋混凝土结构, 其塑性铰区的裂缝宽度发展大大超出了 ACI 355.2 中的预期。
混凝土中后置式机械锚栓的 试验步骤
R6
R6.3 R6.3.1………………………………………………………………...…………………………….. 12
毕业设计(论文)报告纸 R7
R7.2……………………………………………………………...……………………………………....12 R7.2.1…………………...………………………………………………...……………………….. ..12 R7.3 R7.3.1……………………………………………...……………………...……………………….. .12 R7.3.2……………………………...………………………………..….………………………….... 12
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R5.1…………………………………………………………………...……………………………….... 7 R5.1.1………………...…………………………………..…...……..……………….……………..…7 R5.1.2………………...……………………………………...……..………………….……………….7 R5.1.3………………...……………………………………...……..………………….……………….7 R5.2 R5.2.2………………...……………………...……………………..…………………….…………….9 R5.2.3………………...……………………...……..…………………………………….…………….9 R5.2.3.1………………...……………………...…………………………………….…………….10 R5.2.3.4………………...…………………...……..……………………………….…………….10 R5.4……………………………………………………………………...……………………………....10 R5.5 R5.5.1………………...…………………………………...……..…………………… .…………….10 R5.5.3………………...…………………………………...……..…………………… .…………….10 R5.5.3.2………………...…………………………………...……………………….…………….12
毕业设计(论文)外文文献翻译要求

毕业设计(论文)外文文献翻译要求
根据《普通高等学校本科毕业设计(论文)指导》的内容,特对外文文献翻译提出以下要求:
一、翻译的外文文献一般为1~2篇,外文字符要求不少于1.5万(或翻译成中文后至少在3000字以上)。
二、翻译的外文文献应主要选自学术期刊、学术会议的文章、有关著作及其他相关材料,应与毕业论文(设计)主题相关,并作为外文参考文献列入毕业论文(设计)的参考文献。
并在每篇中文译文首页用“脚注”形式注明原文作者及出处,中文译文后应附外文原文。
三、中文译文的基本撰写格式为题目采用小三号黑体字居中打印,正文采用宋体小四号字,行间距一般为固定值20磅,标准字符间距。
页边距为左3cm,右2.5cm,上下各2.5cm,页面统一采用A4纸。
四、封面格式由学校统一制作(注:封面上的“翻译题目”指中文译文的题目,附件1为一篇外文翻译的封面格式,附件二为两篇外文翻译的封面格式),若有两篇外文文献,请按“封面、译文一、外文原文一、译文二、外文原文二”的顺序统一装订。
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学号指导教师。
毕业设计外文文献翻译

毕业设计外文文献翻译Graduation Design Foreign Literature Translation (700 words) Title: The Impact of Artificial Intelligence on the Job Market Introduction:Artificial Intelligence (AI) is a rapidly growing field that has the potential to revolutionize various industries and job markets. With advancements in technologies such as machine learning and natural language processing, AI has become capable of performing tasks traditionally done by humans. This has raised concerns about the future of jobs and the impact AI will have on the job market. This literature review aims to explore the implications of AI on employment and job opportunities.AI in the Workplace:AI technologies are increasingly being integrated into the workplace, with the aim of automating routine and repetitive tasks. For example, automated chatbots are being used to handle customer service queries, while machine learning algorithms are being employed to analyze large data sets. This has resulted in increased efficiency and productivity in many industries. However, it has also led to concerns about job displacement and unemployment.Job Displacement:The rise of AI has raised concerns about job displacement, as AI technologies are becoming increasingly capable of performing tasks previously done by humans. For example, automated machines can now perform complex surgeries with greaterprecision than human surgeons. This has led to fears that certain jobs will become obsolete, leading to unemployment for those who were previously employed in these industries.New Job Opportunities:While AI might potentially replace certain jobs, it also creates new job opportunities. As AI technologies continue to evolve, there will be a greater demand for individuals with technical skills in AI development and programming. Additionally, jobs that require human interaction and emotional intelligence, such as social work or counseling, may become even more in demand, as they cannot be easily automated.Job Transformation:Another potential impact of AI on the job market is job transformation. AI technologies can augment human abilities rather than replacing them entirely. For example, AI-powered tools can assist professionals in making decisions, augmenting their expertise and productivity. This may result in changes in job roles and the need for individuals to adapt their skills to work alongside AI technologies.Conclusion:The impact of AI on the job market is still being studied and debated. While AI has the potential to automate certain tasks and potentially lead to job displacement, it also presents opportunities for new jobs and job transformation. It is essential for individuals and organizations to adapt and acquire the necessary skills to navigate these changes in order to stay competitive in the evolvingjob market. Further research is needed to fully understand the implications of AI on employment and job opportunities.。
写字楼框架结构设计文献综述+开题报告+外文翻译

附件一:课题名称开发区某髙级写字楼框架结构设计主要任务与目标上木工程专业结构工程方向毕业设讣的教学过程,是实现本科培养目标要求的重要的实践教学环也是学生在毕业前的最后学习和综合训练阶段;对于提升学生综合素质、培养教学与工程实践接轨有着重要的意义。
通过深入实践、了解社会、撰写论文等毕业设计(论文)诸环节,着重培养学生综合分析、解决问题以及组织活动和社交能力,尤其在独立工作能力方而上一个台阶。
同时对学生的思想品徳、工作态度、工作作风、事业心和责任心等诸方而都会有很大影响,对于提高毕业生全而素质具有重要意义。
主要内容与基本要求1、建筑部分(1)总建筑而积10000m 2左右。
(2)技术要求:建议层高4. 2 m,总高不大于30m,采用不上人屋而;基本雪压0.3 k N/m 2,基本风压0.5kN / m 2。
抗震设防烈度为6度。
地质条件为素填土0.5m,淤泥质粘土13.5m砂上10m,地下水位在地表一3.0 00m0(3)设计内容及要求完成的图纸内容为施工图深度要求。
应完成图纸内容:1)按建筑制图标准规泄绘制图纸若干张,要求完成下列内容:2主要内容与基本要求建筑设计总说明,平、立、剖、详图等;门窗统汁表(门窗明细表中的内容有编号、名称、洞口尺寸(宽X高(m m))、数量等)等。
2)各层平而图,注写图名和比例。
标注房间名称,标注各部分尺寸:外部尺寸:三道尺寸(即总尺寸、轴线尺寸、墙段和门窗洞口尺寸)以及底层室外台阶、坡道、散水等尺寸。
内部尺寸:内部墙段、门窗洞口和墙厚等细部尺寸。
标注室内外地而标高、各层楼面标髙。
标注轴线及轴线编号、门窗编号、剖切符号和详图索引符号等。
3)立面图(不少于两个),包括各个立而的建筑设计及有关尺寸:标明建筑外形以及门窗、雨篷、外廊等构配件的形式和位置,注明外墙饰面材料和做法。
标注边轴线及编号,注写图名和比例。
4)剖而图比例(不少于一个),包括剖而组合、房间各部分的髙度及楼梯剖而;标注室内外地而、楼而、平台面、门窗洞口顶面和底面以及檐口底而或女儿墙顶面等处的标高。
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附录1:外文原文.Word 文档附录2:外文翻译钢筋混凝土建筑在地震中的抗倒塌安全性研究(二):延性和非延性框架的对比分析(Abbie B. Liel1, Curt B. Haselton2, and Gregory G. Deierlein3)摘要:本文是两篇配套论文的第二篇,旨在探讨钢筋混凝土框架结构在地震中的抗倒塌安全性,并检验加利福尼亚州在20世纪70年代中期之前所建非延性框架结构建筑的可靠性。
基于对结构响应的非线性动态模拟进行概率评估,以此来计算对应于不同的地运动特性和结构类型时结构倒塌的危险。
评估的对象是一套不同高度的非延性钢筋混凝土框架结构原型,它们是根据1967年版《统筑规》中的抗震规定设计的。
结果表明,当处于一个典型的加利福尼亚高震场地时,非延性钢筋混凝土框架结构发生倒塌的年平均频率围为(5~14)×10-3,这比按现代规设计的结果高出约40倍。
这些数据表明新规对延性构造和能力设计要行之有效的,这使得在过去的30年中新建的钢筋混凝土建筑物的安全性得到明显改善。
通过对延性和非延性结构的安全性比较,有助于出台新的规章来评估和减轻现有的钢筋混凝土框架结构建筑物地震倒塌的危险。
关键词:倒塌;地震工程;结构可靠度;钢筋混凝土结构;建筑;商业;地震影响。
引言20世纪70年代中期以前加利福尼亚州建设的钢筋混凝土框架结构缺乏好的抗震设计理念(例如:加强柱子、钢筋延性构造),这使得它们很容易在地震中发生倒塌。
这些非延性钢筋混凝土框架结构在经历了加利福尼亚州1971年圣费尔南多震,1979年英皮里尔谷震,1987年惠蒂尔纳罗斯震,1994年北山震和世界上其他地方发生的无数地震之后,已经遭受了很严重的地震损害。
这些因素促使人们关注加利福尼亚州的近40000栋钢筋混凝土建筑,其中的一部分在未来地震中可能会发生倒塌而危害生命财产安全。
然而,我们缺乏足够的数据来衡量建筑的危险程度,因而无法确定是大量的建筑均存在这种危险,还是只有特定的建筑物才存在危险。
一栋建筑物发生倒塌的危险大小,不仅取决于其原设计采用的建筑规中的规定,也取决于结构布置、施工质量、建筑位置和场地的地震特性。
除了需要准确评估倒塌的风险之外,选择合适的危险承受值和最低的安全标准也是需要考虑的问题。
在这方面,通过比较评估根据新老建筑规设计出的建筑物,能帮我们找到一种评估手段来确定目前设计能够接受的风险水平。
20世纪70年代中期以来,随着对地震破坏和钢筋延性的深入了解,建筑规中对于钢筋混凝土抗震设计和构造措施的要求发生了显著变化。
同老式非延性钢筋混凝土框架结构相比,现代规要求在高地震地区的框架结构要进行各种能力设计来防止或延缓不利的破坏形式(如柱剪切破坏,梁柱节点破坏)。
虽然人们普遍同意对于建筑规的这些修改是适当的,但还是缺少足够的数据以量化其对地震安全性的改善程度。
这项研究采用基于性能的地震工程方法,以评估地震引起非延性钢筋混凝土框架结构倒塌的可能性。
基于性能的地震工程提供了一个概率框架,利用非线性时程模拟将地面运动强度与结构响应和建筑性能联系起来。
对非延性钢筋混凝土框架结构的评估基于原型结构所做的测试,这套结构是根据1967年《统筑规》设计的。
这些原型结构代表了1950年至1975年间在加州建造的普通钢筋混凝土框架结构。
通过对非延性混凝土框架结构原型的非线性动态分析可以预测倒塌的发生,而在结构倒塌过程中利用仿真模型能够捕获强度和刚度的变化特征。
抗倒塌性能评估的成果是一系列保障建筑安全的措施,并将地震中抗倒塌能力与地震灾害联系到一起。
我们将这些结果与另一篇配套论文中的关于延性钢筋混凝土框架结构的数据进行比较。
原型钢筋混凝土框架结构这些非延性钢筋混凝土框架结构原型考虑了结构高度的变化,结构布置和细部设计,能够覆盖加州旧钢筋混凝土框架结构建筑物设计和性能的的预期围。
制作原型时,我们查阅了钢筋混凝土部件和框架的关键参数,这些参数是由哈兹尔顿等人通过分析和实验获得的。
本项研究共制作了26个非延性钢筋混凝土框架原型建筑物。
本文主要侧重于这些设计中的12个,高度从2层到12层变化,并包括具有可替换设计细节的周边和空间框架侧向抵抗系统。
原型建筑均设计为有着20厘米平面楼板系统和7.6米柱间距的办公楼房。
2层和4层建筑的平面尺寸为38.1m×53.3m,8层和12层建筑的平面尺寸为38.1m×38.1m。
建筑首层层高4.6m,其余层层高4.0m。
我们参考了20世纪60年代在加州建设的钢混建筑的原结构图,来为原型结构选择典型的结构部置和几何形状。
原型仅限于无填充墙的钢筋混凝土框架,并且在高度和平面上比较规则,没有出现明显的强度或刚度突变。
非延性钢混原型结构是按照1967年《统筑规》中的最高地震烈度区(3区)设计的,那个时代加州的大部分都属于这个烈度区。
二维框架的结构设计是由所需的强度和刚度控制的,应满足重力和地震荷载组合的要求。
设计也符合所有相关的建筑规要求,包括最大和最小配筋率和最大箍筋间距。
1967年《统筑规》规定,如果采用了延性构造措施,可以适当地减小基底剪应力。
然而,本研究并没有进行这种折减,只考虑标准的细部构造。
表1总结了每个结构的设计细节,在Liel 和Deierlein处可以获得非延性钢混原型的完整资料。
有4个4层和12层的原型做了细部加强,这会在随后的文章里作介绍。
我们将非延性原型钢混框架结构的抗倒塌性能与配套论文中的延性原型钢混结构做了对比。
如表2总结,这些延性框架的设计依据了《国际建筑规》(ICC 2003)、ASCE 7 (ASCE 2002),、和ACI 318 (ACI 2005)中的规定,并符合所有相关规中关于强度,刚度,承载能力和特殊框架构造的要求。
这些结构得益于自20世纪70年代以来钢筋混凝土抗震设计规不断增加的条款,包括各种关于能力设计的规定(例如:强柱弱梁,节点抗剪承载力设计)和构造措施的改进(例如,在梁柱塑性铰区增加横向约束,提高对搭接的要求,闭合箍筋)。
这套延性钢混框架是按照在土壤类型为Sd类的典型高震洛杉矶场地设计的,它处在2003版IBC设计地图的过渡区域。
表1 原型延性和非延性框架的设计属性附注:a)1967年《统筑规》(UBC)中设计基底剪切系数取值为C=0.05/T(1/3)≤0.10。
对于抵抗力矩的框架T=0.1N,N是层数(ICBO 1967);b)现代建筑的设计基底系数根据设计场地的反应谱取值。
洛杉矶场地的设计反应谱SDS=1.0g,SD1=0.60g。
计算式采用的周期根据规公式算得,是结构的高度(英尺),并且规定了计算周期的上限()(ASCE 2002);c)柱子的属性沿结构高度变化,此处列出的是首层柱子的属性;d)各构件横向钢筋的配置由所需的剪切强度确定。
每个位置至少有两根3号钢筋;e)延性钢筋混凝土框架横向钢筋的配置由所需的剪切强度确定。
所有的弯锚都有抗震构造,并使用4号钢筋(ACI 2005);f)梁属性沿结构的高度变化,此处列出的是第二层梁的属性;g)所设计结构的梁柱构造优于平均水平;h)所设计结构的节点构造由于平均水平。
表2 原型延性和非延性框架的建模参数附注:a)此处列出的是首层柱的参数;b)轴向荷载包括恒荷载和25%的活荷载;c)有效割线刚度为通过40%屈服强度时的割线刚度;d)滞后能量耗散的计算公式为;e)参数获得于对结构模型的特征值分析;f)所设计结构梁柱的构造优于平均水平;g)所设计结构的节点构造优于平均水平。
对比表1所示的结构,我们可以看出在过去四十年间钢筋混凝土框架抗震设计规的变化。
尽管对设计基底剪力的方程进行了修改,但对于相同高度的延性和非延性钢混框架结构,计算的结果还是相当接近的,只有在计算最矮的结构时才有较大的偏差。
两组建筑物之间明显的差别是部件的设计和构造措施,特别是在数量、布局、和横向加固方面。
现代钢混框架结构受剪切能力设计规定的影响,对于箍筋间距有着更严格的限制,例如:在延性钢筋混凝土梁和柱中横向钢筋要加密2到4倍。
最小配箍率保证了柱子有足够的强度来延缓楼层机构的形成。
因此,在节点处柱强度与梁强度的比值延性钢筋混凝土框架结构平均比非延性钢筋混凝土框架结构高出约30%。
非延性钢混框架结构对于梁柱节点区域的设计或加固也没有特别规定,而延性钢混框架结构的柱子则要求规定的尺寸并添加横向钢筋,以满足节点剪力的需要。
为满足特殊框架结构对节点剪切强度的要求,通常增加柱子的尺寸,从而减小轴压比。
非线性仿真模型每个原型非延性钢混框架的非线性分析模型,都包括一个二维三开间的侧向抗力系统,如图1所示。
分析模型能够体现柱子、梁、梁柱节点材料的非线性和大尺寸效应(P-Δ效应),这对于模拟框架的倒塌时十分重要的。
我们用端部部分铰接的构件模拟梁、柱及其节点,这些铰被部分约束以模拟真实情况,类似于弹簧铰。
结构模型不包括任何非结构构件或支撑重力荷载的部件,它们都不属于横向支撑系统。
本模型是在OpenSees中建造的,该软件具有强大的计算功能。
图 1. 钢筋混凝土框架结构分析模型示意图在另一篇配套论文中,用集中弹簧模拟非弹性的梁、柱、节点,它们是根据三线图和伊瓦拉等人的滞后原则理想化而来的。
根据一系列经验关系,我们对代表梁和柱构件的非线性弹簧特性进行了预测,这些关系将柱子的设计特征同建模参数联系起来,并与实验数据进行了校核。
用于改进经验关系的试验,包括大量非延性构造的钢筋混凝土柱。
预测的模型参数反映非延性和延性钢筋混凝土构件的弯矩-转角行为的差异。
正如配套论文中所说的,由于缺少足够的梁的数据,对于钢筋混凝土梁的模型参数的校核是建立在柱子在低轴压水平下被测试的基础上的。
图2(a)显示了延性及非延性柱(均为4层建筑)的单调骨干曲线的性质。
众所周知,最大塑性转角θcap,pl对预测倒塌的发生有重要影响,它是柱子约束钢筋和轴压水平的函数,延性钢筋混凝土柱比非延性钢筋混凝土柱大约大2.7倍。
延性钢筋混凝土柱还有更强的后期旋转能力(θpc),这决定了的柱子屈服后强度退化的速度。
图2(b)表明在一个典型的地震加载过程中,柱的强度和刚度不断下降。
起始曲线的减弱过程由弱化参数λ控制,这是一个耗能的过程。
在非延性柱中由于缺少足够的约束,并且轴压荷载更大,其耗能的能力要比延性柱小很多。
模型参数需要校准到预期的水平。
在分析时需计入重力荷载,并忽略轴向、弯曲、剪切变形之间的相互作用,而这些因素对高层建筑物的影响是十分明显的。
图 2. 用非弹性弹簧模拟位于4层框架结构首层中的钢筋混凝土柱,其特点是:(a)单调;(b)循环。
表2中为非延性和延性的原型钢筋混凝土柱的建模参数。
钢筋混凝土梁的属性也是类似的,它们在其他地方被列出。
所有模型元件的属性值都取为为测试值的中值尽管原型梁和柱的建模参数已经考虑了构件端部的粘结滑移,但它们还是不能模拟到由于非延性框架锚固或搭接失效而引起的显著破坏。