防屈曲支撑钢框架的阻尼比研究

consistent with the principles of approximate determination of the structure of the additional damping ratio.
KEY WORDS： steel frames， buckling-restrained brace, structure damping ratio ,
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第一章绪论拉力变形压力普通支撑防屈曲支撑图11防屈曲支撑和普通支撑的滞回性能对比图12防屈曲支撑与普通支撑变形对比表11防屈曲支撑框架与传统支撑框架的抗震性能比较传统支撑框架防屈曲支撑框架主体结构传统支撑主体结构防屈曲支撑小震弹性弹性弹性弹性弹性或塑性弹性或屈曲弹性塑性耗能大震塑性屈曲弹性或塑性塑性耗能中大震后拆除结构损坏部分更换损坏的防屈曲支撑防屈曲支撑作为消能减震技术的重要组成部分具有减震机理明确减震效果明显安全可靠经济合理的特点可以满足不同结构的抗震要求
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本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的 研究成果，除了文中特别加以标注和致谢之处外，论文中不包含其他人已经发表 或撰写过的研究成果， 也不包含为获得 天津大学 或其他教育机构的学位或证 书而使用过的材料。 与我一同工作的同志对本研究所做的任何贡献均已在论文中 作了明确的说明并表示了谢意。
energy dissipation, time-history analysis
目
录
第一章 绪论 .................................................................................................................................... 1 1.1 引言 .................................................................................................................................... 1 1.2 支撑概述 ........................................................................................................................... 1 1.2.1 传统支撑 ................................................................................................................. 1 1.2.2 防屈曲支撑 ............................................................................................................. 2 1.3 防屈曲支撑的发展和应用................................................................................................. 4 1.3.1 防屈曲支撑的国内外研究现状.............................................................................. 4 1.3.2 防屈曲支撑的工程应用........................................................................................ 12 1.4 防屈曲支撑框架体系的优点和缺点............................................................................... 14 1.5 本文研究的主要内容 ...................................................................................................... 15 第二章 防屈曲支撑设计与施工 .................................................................................................. 16 2.1 防屈曲支撑基本性能 ...................................................................................................... 16 2.1.1 防屈曲支撑的分类................................................................................................ 16 2.1.2 防屈曲支撑的力学参数非对称............................................................................ 17 2.1.3 防屈曲支撑的间隙................................................................................................ 18 2.1.4 防屈曲支撑的刚度................................................................................................ 20 2.1.5 防屈曲支撑的耐久性............................................................................................ 21 2.1.6 防屈曲支撑的轴向变形........................................................................................ 22 2.2 防屈曲支撑的布置原则................................................................................................... 23 2.3 节点设计 .......................................................................................................................... 23 2.3.1 节点构造要求 ....................................................................................................... 23 2.3.2 节点连接设计 ....................................................................................................... 24 2.4 防屈曲支撑框架结构体系设计...................................................................................... 24 2.5 防屈曲支撑的安装与施工.............................................................................................. 25 第三章 结构阻尼比概述 .............................................................................................................. 26 3.1 基本概念 ......................................................................................................................... 26 3.2 阻尼模型 ......................................................................................................................... 27 3.2.1 粘滞阻尼与复阻尼............................................................................................... 27 3.2.2 比例阻尼与非比例阻尼....................................................................................... 27 3.2.3 瑞利阻尼 .............................................................................................................. 28 3.3 阻尼比 ............................................................................................................................. 30
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摘 要
防屈曲支撑作为消能减震技术的重要组成部分，在 1995 年日本阪神地震和 1994 年美国北岭之后广泛应用在世界范围的工程中。在我国，防屈曲支撑的研 究、设计和工程应用起步较晚，但是发展迅速。防屈曲支撑在一批重要公共建筑 的工程应用，为我国在工程设计、施工和研究积累了宝贵的实践经验。同时，推 动了相关标准的制定和完善。但是，我国由于起步较晚，工程应用相对较少，设 计标准简单，从而制约了防屈曲支撑技术在我国的推广、应用和提高。为此，本 文以中新生态城中学的教学楼作为工程背景， 讨论了防屈曲支撑对支撑框架的耗 能减震效果和附加阻尼比；并在总结前人研究成果的基础上，对防屈曲支撑钢框 架的设计和施工提供了一些合理化建议。 本文比较了防屈曲支撑与传统支撑，并对防屈曲支撑的国内外研究现状、工 程应用状况及其结构体系的优缺点进行了简单的阐述。 在总结前人研究成果的基 础上，对防屈曲支撑的设计和施工提供了一些建议。同时，阐述了结构阻尼比的 概念，并对三类常用阻尼比模型的基本特点进行了比较，概述了消能减震结构的 附加阻尼比。在上述基础上，以中新生态城中学的教学楼作为工程背景，假设防 屈曲支撑的布置保持不变，相继建立了四个结构模型，并采用了振型分解反应谱 法、小震、中震、大震下的时程分析法对结构的耗能减震性能做了研究比较；概 述了四类模型和附加阻尼比理论， 以在大震作用下结构的层间位移趋于一致的原 则近似确定结构的附加阻尼比。
关键词： 钢框架 防屈曲支撑 结构阻尼比 耗能减震 时程分析
ABSTRACT
Buckling-restrained brace was used widely in the world after the Kobe earthquake in 1995 of Japan and the Northridge earthquake in 1994 of Amercia as an important part of energy dissipation damping technology. The research，design and engineering application of buckling-restrained brace start ratively late in our country, but develop rapidly. Engineering application of buckling-restrained brace in a number of important public architecture has accumulated a wealth of valuable practical experience for our country in the engineering design, construction and research ,While promoting the relevant standards.It restricts the popularization , application and improvement of buckling-restrained brace in China because of starting relatively later ,less engineering application, simpler design standard Therefore, I discussed dissipative damping effect and additional damping ratio of buckling-restrained brace to support framework in this paper，as an new school buildings as engineering background. And at the conclusion of the previous research results on the basis,I provide some rationalization proposal about design and construction. It compares the difference of buckling restrained brace and traditional brace, and explains the domestic and foreign present situation, application status and the advantages and disadvantages of structure system.Then it summarizes the previous research results to provide some constructive opinions in design and construction of buckling-restrained brace.On the other hand，it introduces the concept of structural damping ratio, and compares three kinds of model of the basic features. It summarizes the additional damping ratio of the energy dissipation structure finally.On the basis ， four structure models were established and it adopts the mode decomposition response spectrum method, small earthquake, earthquake, earthquake time-history analysis of law on the structure of the energy dissipation properties do comparative study on the basis of hypothesis of buckling restrained brace layout remained the same, as the teaching building in new ecological city as the engineering background.It introduces the four kinds of models and additional damping ratio theory, and then to moderate structures under the effect of interlayer displacement tends to be