70+120+70高速铁路连续梁桥设计

轨道交通学院

毕业设计（论文）

题目：高速铁路70m+120m+70m连续梁桥设计

专业土木工程（轨道工程）

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学号

姓名

指导教师

2014年5月25日

高速铁路70m+120m+70m连续梁桥设计

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。

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 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 概述 (6)

1.1 连续梁桥特点 (6)

1.1.1 连续梁桥与简支梁桥和悬臂梁桥相比具有以下特征 (7)

1.2 预应力混凝土结构 (8)

1.2.1 预应力混凝土结构基本原理 (9)

1.2.2 预应力结构特点 (10)

1.2.3 预应力施加方法............................................................... 错误！未定义书签。

1.3 设计特点 (10)

1.4 施工工艺...................................................................................... 错误！未定义书签。

1.5 Midas软件介绍 (11)

1.6 小结 (11)

2 桥跨整体设计和局部尺寸 (12)

2.1 设计基本资料 (12)

2.1.1 桥面跨径及桥宽 (12)

2.1.2 设计荷载 (12)

2.1.3 材料及工艺 (12)

2.1.4 设计依据 (13)

2.1.5 基本设计数据 (13)

2.2 主梁结构设计 (13)

2.2.1 截面尺寸拟定 (13)

2.3 小结 (15)

3 荷载内力计算 (16)

3.1 单元划分 (16)

3.2 主梁内力计算 (19)

3.2.1 荷载内力计算 (19)

3.2.2 效应作用组合 (20)

3.2.3 主梁截面数据 (21)

3.3 小结 (22)

4 预应力筋的设计与布置 (23)

4.1 钢束估算 (23)

4.1.2 估计方法 (23)