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摘要本设计是根据毕业设计任务书要求和设计规范的规定，参照已建桥梁设计方案确定桥梁型式和结构形式，主要分析了桥梁在各种荷载作用下的效应。预应力混凝土连续梁桥因其结构受力性能好、变形小等优点成为最富有竞争力的主要桥型之一，本桥采用分离式路基，设计时只考虑半面路基的设计。施工方法选为预制箱梁法。30574
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上部构造的计算拟定箱梁截面，对4×35m跨径进行了很详细的单元划分，首先进行恒载、活载的计算，在此基础上进行荷载组合,绘制弯矩和剪力包络图；其次,根据短期效应组合配置预应力钢筋，并进行预应力损失的计算；最后，对该连续梁桥进行验算，是否满足设计要求。全桥均采用MIDAS软件进行了计算，全部设计图纸由AutoCAD绘制，计算机编档、排版，打印出图及论文。此外，还翻译了一篇英文文献“ 体外预应力钢筋混凝土梁的刚度”
毕业论文关键词: 设计 预应力 预制箱梁 连续梁桥
Abstract
The design is based on graduation design task book requirements and relevant industry standards。And the graduate design mainly analyzed about the effect of bride under various loads, according to the requirements and the standards of the design assignment. Prestressed concrete continuous beam bridge has become one of the most competitive bridge for its good performance of the structure,small deformation etc.The bridge uses the separation type roadbed, and it only considers the design of the half roadbed. Construction method take the method of precast box girder.
The calculation of the upper structure uses box beam section,the span of 4 x 35m is pided into a very detailed unit.Firstly, the calculation of dead load and live load is carried out, and the load combination is carried out, and the bending moment and shear envelope diagram are drawn.Secondly,making the calculation of the prestress loss according to the short-term effect combination of prestressed reinforcement. Finally, checking the continuous girder bridge to see whether it meets the design requirements. The whole bridge are calculated by MIDAS software, all design drawings are drawn by AutoCAD, and the computer is compiled and printed, and the paper is printed. In addition, an English document, the stiffness of the externally prestressed concrete beams ,is also translated to Chinese.
Key words: design prestressed precast box girder continuous girder bridge
目录
1.绪论 7
1.1 预应力混凝土连续预制箱梁桥概述 7
1.2毕业设计的目的与意义 9
2.设计资料 10
2.1 桥梁概况 10
2.2 设计参数 10
2.3 设计要求 10
2.4计算原则、内容及控制标准 10
2.5规范标准 11
3.桥跨总体布置及结构尺寸拟定 11
3.1 本桥主料材料 11
3.1.1 混凝土 11
3.1.2预应力材料 12
3.1.3普通钢筋 13
3.2结构尺寸 13
3.3 桥孔分跨 16
3.4 截面形式 16
3.4.1 立截面 16
3.4.2 横截面 16
3.4.3典型横断面 17
3.5梁高 18
3.6横隔梁的设置 18
3.7截面尺寸 19
4.荷载计算 23
4.1恒载内力计算 23
4.2主梁分段与施工方法 23
4.2.1分段原则 23
4.2.2具体分段 23
4.2.3主梁施工方法及注意事项 23