论文总字数：48181字

摘 要

本设计是根据任务书的要求与《公路桥规》的规定,对浦仪过江通道东引桥第三联右幅段进行方案比选和设计的。连续梁桥是工程上广泛使用的一种桥型,它不但具有可靠的强度,刚度及抗裂性,而且具有行车舒适平稳,养护工作量小,设计及施工经验成熟的特点。设计一座梁桥必须从桥跨布设,尺寸拟定,钢束布置以及施工方法等方面综合考虑,还要充分考虑设计参数和环境影响。本设计是一联三跨连续梁桥，截面形式为单箱双室等截面。施工方式是满堂支架法。该设计首先进行恒载、活载及次内力的计算,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。下部结构采用钻孔灌注桩，支座采用盆式橡胶支座，并分别对桥墩和桩基础进行了计算和验算。

本设计采用CAD绘图，分析过程通过MIDAS，计算机打印出图及论文。同时翻译了两篇英语文章“Bridges”“Philosophy of Structural Design”.

关键词： 连续梁 等截面 满堂支架法 预应力

Design for the third right section of the east lead bridge of PuYi crossing river channel

This design is based on the requirements of the assignment book and the provisions of the highway bridge regulation, the scheme selection and design of the third right section of the east lead bridge of PuYi crossing river channel. This design is a three-span continuous beam bridge with a single box and two rooms in the form of section, and the whole is equal section. Continuous girder bridge is a bridge which is widely used in engineering, it not only has reliable strength, stiffness and crack resistance, and driving comfort, maintenance workload is small, the characteristics of the design and construction experience and mature. To design a bridge, comprehensive consideration must be given to bridge span layout, dimension formulation, steel beam arrangement and construction method, and full consideration must be given to design parameters and environmental impact. In this design, the constant load, live load and subinternal force are calculated first, on which the load combination is carried out, and the bending moment and shear envelope are drawn. Secondly, the prestressed bars are arranged according to the short-term effect combination, and then the calculation of prestressed loss is carried out. Finally, the continuous beam bridge is checked to see if it meets the design requirements. The structure of the lower part adopts bored cast-in-place pile, the support adopts basin rubber support, and the piers and pile foundation are designed respectively.

All drawings of this design are drawn by CAD. The analysis process is through MIDAS, computer typesetting, printing and thesis. Also, I translated two English articles, "Bridges", "Philosophy of Structural Design".

【Key Words】 continuous bridge;constant section;full framing; prestress

目录

第一章 方案设计 1

1.1 跨径布置 1

1.2 顺桥向设计 2

1.3横桥向设计 2

第二章 恒载计算 5

2.1 节段划分及截面几何要素计算 5

2.2 一期恒载计算 5

2.3 二期恒载计算 6

2.4 总恒载计算 7

第三章 活载计算 10

3.1 汽车荷载 10

3.2 最大、最小弯矩及其对应的剪力计算 11

3.3 最大、最小剪力及其对应的弯矩 15

第四章 次内力计算 19

4.1 温度次内力计算 19

4.2 支座沉降次内力计算 24

第五章 内力组合及内力包络图 26

5.1 短期效应组合 26

5.2 长期组合 27

5.3 基本组合 28

5.4 包络图 29

第六章 预应力筋的计算与布置 32

6.1 原理与方法 32

6.2 预应力筋的配置 32

6.3 钢束布置 35

第七章 净截面及换算截面几何特性计算 42

7.1 概述 42

7.2 净截面几何性质计算 42

7.3 换算截面性质计算 44

第八章 预应力损失及有效预应力计算 46

8.1 控制应力及有关参数计算 46

8.2 摩擦损失 46

8.3 锚具回缩损失 47

8.4 弹性压缩损失 48

8.5 应力松弛损失 56

8.6 收缩徐变损失 56

8.7 预应力损失组合及有效预应力计算 58

第九章 承载能力极限状态验算 61

9.1 正截面承载力验算 61

9.2 斜截面抗剪承载力验算 64

第十章 正常使用极限状态验算 67

10.1 抗裂验算 67

第十一章 持久状况与短暂状况应力验算 70

11.1 持久状况截面混凝土法向应力验算 70

11.2 短暂状态应力验算 70

第十二章 墩及桩基础设计与计算 73

12.1 支座 73

12.2 墩身设计与验算 74

12.3 承台设计 76

12.4 桩基础设计 76

第十三章 工程概预算 79

13.1 工程量概算 79

参考文献 80

致谢 81

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