三跨预应力混凝土连续箱梁桥设计

The second step is to use qiaoliang software to analyze internal gross force of the structures (including dead load and lived load), the internal force composition can be done by using the compute results. According to the internal force composited, the evaluated amount of longitudinal tendons can be worked out, then we can distribute the tendons to the bridge.
1.1.2工程概况....................................................7
1.1.3地基评价....................................................8
1.2设计资料.......................................................8
The third steps is to calculate the loss of pre-stressing and secondary force due to pre-stressing, first dead loads and temperature, bearing displacement, and so on.
3.3桥梁设计荷载..................................................18
3.4主梁内力计算..................................................18
3.4.1恒载内力计算...............................................18
2.1.6方案选比...................................................12
2.2梁体截面比选形式..............................................13
2.3桥墩方案比选..................................................14
2.1.3拱桥.......................................................11
2.1.4桥拱组合桥.................................................11
2.1.5斜拉桥.....................................................12
1.前言.............................................................7
1.1工程概况.......................................................7
1.1.1气候条件....................................................7
其次，利用桥梁博士分析内力结构总的内力(包括恒载和活载的内力计算)。用于计算的内力组合结果也由桥梁博士计算而得，从而估算出纵向预应力筋的数目，然后再布置预应力钢丝束。
再次，计算预应力损失。
然后进一步进行截面强度的验算，其中包括承载能力极限状态和正常使用极限状态。在正常使用极限状态验算中包括计算截面的混凝土法向应力验算、预应力钢筋中的拉应力验算、截面的主应力计算。
3.1.2主梁尺寸拟定（跨中截面）...................................16
3.1.3主桥毛截面几何特性计算.....................................17
3.2本桥主要材料..................................................17
1.2.4下部结构....................................................8
1.3设计依据..........................9
2.方案比选........................................................10
3.上部结构尺寸拟定及内力设计......................................16
3.1概述..........................................................16
3.1.1主跨径的拟定...............................................16
The major girder applies Full scaffold construction , symmetric equilibrium construction .
The procedure of the design is listed below:
The first step as to dimension the structural elements and details of which it is composed, it can’t and certainly should without being fully coordinated with the planning and workingphrases of the project.Considering the distorting stiffness and the bending stiffness, box birder goes as second-parabolic curve, for second-parabolic curve is generally similar to the change of continuous bridge’s bending moments along. The section at the support is strengthened by the provision of thickened webs , bottom slabs and a cross beam , the thickness of the bottom slab and the top slab is0.30m.
3.4.2人群荷载作用下内力求解.....................................21
3.4.3计算各截面在活荷载下的弯矩.................................22
另外，本设计对箱梁扭转计算，风载，地震，以及结构动力特性没有考虑。
关键词：预应力混凝土连续梁桥，桥梁博士，满堂支架施工
ABSTRACT
The graduate design is mainly about the design of superstructure of short-span pre-stressed concrete continuous boxGirderBridge. Pre-stressed concrete continuous Girder Bridge become one of main bridge types of the most full of competion ability because of subjecting to the dint function with the structure good, having the small defomation, few of control joint,going smoothly comfort,protected the amout of engineering small and having the powerfully ability of earthquake proof and so on. For time and ability limited, the design of the substructure, transverse pre-stressing and vertical pre-stressing is not considered.
预应力损失计算71预应力筋与孔道壁之间摩擦引起的盈利损失72锚具变形钢筋回缩和接缝引起的应力损失73钢筋与台座之间温差引起的预应力损失74混凝土弹性压缩引起的应力损失75预应力筋松弛引起的应力损失76混凝土收缩和徐变引起的应力损失8
三跨预应力混凝土连续箱梁桥设计
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摘 要
毕业设计主要是关于小跨度预应力混凝土连续梁桥上部结构的设计。预应力混凝土连续梁桥以结构受力性能好、变形小、伸缩缝少、行车平顺舒适、养护工程量小、抗震能力强等而成为最富有竞争力的主要桥型之一。受时间和个人能力的限制，本次毕业设计没有具体涉及到下部结构、横向预应力及竖向预应力的设计。
1.2.1技术标准....................................................8
1.2.2主要材料....................................................8
1.2.3上部结构....................................................8
The spans of the bridge are30+45+30mm,main beam is respective designed, each suit has one box two roomand three traffic ways,the width of the bridge surface is18m.