53+80+53米悬臂施工连续梁桥设计+CAD图纸
毕业论文关键词：预应力混凝土连续梁桥；箱形梁；应力；悬臂施工
The design of 53 +80 +53 m cantilever construction continuous beam bridge
Abstract: The design is the subject of 53 +80 +53 m cantilever construction continuous beam bridge.The design program uses a three-span continuous beam structure prestressed concrete sections, the main span as 80m, side span of 53m, a total length of 186m, a one-way two-lane; main beam of uniform cross section Single Cell Box Box beams, box width 14m.This thesis is the study of the cantilever construction method .
In this system , the superstructure is erected by means of cantilever truck in sections generally of 3.5 m .The cantilever truck ,whose cost is relatively small and which is attached firmly to permanent construction , ermits by repeated use the construction of large bridges . This essay focuses on the design and calculation process of the superstructure.Firstly, make an overall str-ucture design of the main span and study out superstructure’s size.Secondly perform the calcul-ation of the internal force and reinforcing bar on the superstructure.Thirdly,check the intensity,stress.Finally,check the deflection.
Key words: prestressed concrete continuous bridge;box girder;stress;the cantilever construction method
目录
1 绪论 1
1.1 预应力混凝土连续梁桥概述 1
1.2 发展趋势 2
1.3 毕业设计的目的与意义 2
2 设计基本资料 4
2.1 设计采用的规范 4
2.2 设计基本情况 4
2.3 设计荷载 4
3 结构尺寸拟定 5
4 混凝土连续梁桥内力计算 7
4.1 划分梁段单元 7
4.2 主梁内力计算 9
4.3 荷载组合以及原理 11
4.4 弯矩剪力包络图 12
5 预应力筋的设计与布置 14
5.1 预应力筋的估算 14
5.2 预应力束的布置 20
6 截面验算 27
6.1 施工阶段 27
6.2 截面正应力验算 28
6.3 截面抗剪承载力验算 39
6.4 截面主拉应力和主压应力验算 44
7 总结 53
致谢 54
参考文献 55
1 绪论
1.1 预应力混凝土连续梁桥概述
1.2 发展趋势
1.3 毕业设计的目的与意义
毕业设计旨在培养毕业生的综合能力，灵活运用大学所学的各门基础课和专业课知识，并结合相关设计规范，独立的完成一个专业课题的设计工作。设计过程中，提高学生的独立分析问题，解决问题的能力和动手能力，具备初步的专业工程技术人员的水平，并为今后的工作奠定良好基础。