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摘要：20世纪90年代以来，中国的高速铁路取得了长足进步，为经济建设作出了重要贡献。桥梁作为高速铁路的重要组成部分，在铁路交通运输中起着不可替代的作用。连续梁桥是常用的一种桥梁结构，预应力混凝土连续梁桥是其主要结构形式，它具有接缝少、可以减小梁高，节省材料，且刚度大，整体性好，超载能力大，安全度大，桥面伸缩缝大，行车舒适等优点。本设计依据任务书要求，采用单箱单室截面形式，通过midas软件进行设计，根据桥梁的尺寸拟定建立桥梁基本模型，然后进行内力分析，计算配筋结果，进行截面验算。本文详细介绍了70m+120m+70m连续梁桥设计的截面尺寸拟定、桥梁模型建立、荷载施加、截面配筋和桥梁截面验算等过程，经过分析验算表明该设计计算方法正确，内力分布合理，符合设计任务的要求。22236
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毕业论文关键词：高速铁路；连续梁桥；结构分析；过程验算
The design of a high-speed railway continuous girder bridge with the main spans of (70+120+70)m
Abstract: Since the 1990s, China's high-speed railway has made considerable progress,made a significant contribution to economic development. As an important part of high-speed railway, bridge plays an irreplaceable role in the rail transport. Continuous girder bridge is a common bridge structure，pre-stressed concrete continuous girder bridge is its main structure form, it has advantages of fewer seams, high beam can be reduced, saving material and stiffness, good integrity, high overload capacity, safety degree, large deck joints, driving comfort, etc. The design basis requirements of the mission statement, using cross-section in the form of single-chamber single box, designed by midas software. According to the size of the bridge intended to establish the basic model of the bridge, and then the internal force analysis, calculation results of reinforcement, conducted a cross-sectional checking. This paper describes the 70m +120 m +70 m-sectional dimensions of the proposed continuous girder bridge design, bridge model, the applied load, and bridge reinforcement section of the process of checking,
etc., through the analysis of checking design calculations show that the method is correct, rational distribution of internal forces, in line with requirements of the design task.
Keywords: high-speed railway; continuous girder bridge; structural analysis; checking process
目录
1 绪论 1
1.1 高速铁路简介 1
1.1.1 中国高铁现状 2
1.2 预应力混凝土连续梁桥 3
1.2.1 连续梁桥的分类 4
1.2.2 预应力混凝土结构特点 4
1.3 施工方案 5
1.4 Midas简介 5
1.5 小结 6
2 桥跨整体设计和细部尺寸拟定 7
2.1 设计基本资料 7
2.1.1 主要技术指标 7
2.1.2 材料规格 7
2.1.3 设计恒载 7
2.1.4 结构构造 8
2.1.5 设计依据 8
2.2 主梁结构设计 8
2.3 小结 10
3 荷载内力计算 11
3.1 单元划分 11
3.2 主梁内力计算 13
3.2.1 荷载内力计算 13
3.2.2 效应作用组合 19
3.3 小结 20
4 预应力筋的设计与布置 21
4.1 钢束估算 21
4.2 估算方法 21
4.3 配筋数确定 23
4.4 小结 26
5 截面验算 28
5.1 截面应力验算 28
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