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摘要：20世纪以来，中国的高速铁路取得了高速发展，为经济建设作出了重要贡献。连续刚构桥是高速铁路的极为重要的组成部分，在铁路交通运输中起着不可忽视的作用。连续刚构桥既有连续梁桥结构体系的特点：具有结构刚度好、变形小、行车平顺舒适、抗震能力强、养护简易、伸缩缝少、等优点，而且具有T形刚构桥更有利于机械化施工、有利于悬臂浇注、有利于向更大跨径方向发展。本次桥梁设计依照任务书要求，采用单箱单室截面形式，通过Midas软件进行设计及后期验算，根据桥梁尺寸拟定建立刚构桥的基本模型，然后施加荷载进行内力分析，计算配筋结果，并进行截面验算。本文详细介绍了45m+70m+45m高速铁路连续刚构桥的截面尺寸拟定、桥梁模型建立、荷载施加、内力分析、截面配筋和桥梁截面验算等过程，经过截面验算等表明该设计计算方法正确，截面尺寸设计合理，内力分布合理，桥梁布筋合理，符合任务书的要求。35150
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毕业论文关键词：高速铁路；连续刚构桥；结构分析；过程验算
The design of a high-speed railway continuous rigid bridge with the main spans of (45+70+45)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 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高速铁路连续刚构桥的发展和特点 1
1.1.1 中国高铁现状 1
1.1.2 连续刚构桥的特点 1
1.2 预应力混凝土连续梁桥 2
1.2.1连续刚构桥的适用范围 2
1.2.2 预应力混凝土结构特点 2
1.3 施工方案 3
1.4 Midas简介 4
1.5 本设计主要内容 4
2 桥跨整体设计和细部尺寸拟定 5
2.1 设计基本资料 5
2.1.1 主要技术指标 5
2.1.2 材料规格 5
2.1.3 设计恒载 5
2.1.4 结构构造 6
2.1.5 设计依据 6
2.2 主梁结构设计 6
2.3 小结 9
3 荷载内力计算 10
3.1 单元划分 10
3.2 主梁内力计算 12
3.2.1 荷载内力计算 12
3.2.2 效应作用组合 17
3.3 小结 18
4 预应力筋的设计与布置 19
4.1 钢束估算 19
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