论文总字数：44178字

摘 要

本设计是根据设计任务书的要求和《公路钢筋混凝土及预应力混凝土桥涵设计规范》的规定，优化设计江苏省蔷薇河预应力混凝土桥方案。首先根据任务书中工况要求和规范要求进行该桥的方案设计和比选，选定的方案为跨度不等的三跨预应力混凝土连续梁桥，采用单箱单室变高度箱型截面，为直腹板形式， 施工方式为悬臂施工。根据规范要求和已建成的桥梁数据初步拟定桥跨布置和截面尺寸后，利用 Midas 软件建立桥梁模型并计算结构的恒载内力、活载内力及次内力等，接着进行荷载组合，包括基本组合和频遇组合，并画出内力包络图；然后按照规范进行预应力钢筋的估算与布置、截面几何特性、预应力损失等；然后通过手算对上部结构进行承载能力和正常使用阶段的验算，结果均满足设计要求。最后进行下部结构初步设计，采用盆式橡胶支座、双柱墩和桩基础。此外，本设计也进行了施工图绘制等工作。

关键词：方案设计 连续梁桥 预应力 悬臂施工

Design of Prestressed Concrete Continuous Girder Bridge of Luowei River in Jiangsu Province

Abstract

This design is based on the requirements of the design task book and the design of the "Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts" to optimize the design of the prestressed concrete bridge of the Weiwei River in Jiangsu Province. Firstly, according to the working conditions and specifications of the task book, the design and comparison of the bridge are carried out. The selected scheme is a three-span prestressed concrete continuous girder bridge with different spans, which adopts a single box and single chamber variable height box section. In the form of straight web, the construction method is cantilever construction. After initializing the bridge span and section dimensions according to the specification requirements and the completed bridge data, the Midas software is used to build the bridge model and calculate the dead load internal force, live load internal force and secondary internal force of the structure, and then load combination, including basic combination and The frequency combination is drawn, and the internal force envelope diagram is drawn; then the estimation and arrangement of the prestressed steel bars, the section geometry, the prestress loss, etc. are carried out according to the specifications; then the load bearing capacity and the normal use phase of the upper structure are checked by hand calculation, The results all meet the design requirements. Finally, the preliminary design of the lower structure was carried out, using a basin rubber bearing, a double column pier and a pile foundation. In addition, this design also carried out work such as drawing construction drawings.

Key words: scheme design, continuous beam bridge, prestress, cantilever construction

目录

第一章 方案设计 1

1.1 跨径布置 1

1.2 顺桥向设计 1

1.3 横桥向设计 3

第二章 恒载计算 5

2.1 一期恒载计算 5

2.2 二期恒载计算 5

2.3 总恒载效应计算 6

第三章 活载计算 8

3.1 汽车荷载 8

3.2 最大、最小弯矩计算 9

3.3 最大、最小剪力计算 12

第四章 次内力计算 16

4.1 温度次内力计算 16

4.2 支座沉降次内力计算 22

第五章 内力组合及内力包络图 23

5.1 频遇组合 23

5.2 基本组合 24

5.3 包络图 25

第六章 预应力筋的计算与布置 27

6.1 原理与方法 27

6.2 预应力筋的配置 27

6.3 钢束布置 30

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σl1 47

8.3 锚具回缩损失σl2 54

8.4 弹性压缩损失σl4 60

8.5 应力松弛损失σl5 61

8.6 收缩徐变损失σl6 61

8.7 预应力损失组合及有效预应力计算 64

第九章 承载能力极限状态验算 66

9.1 正截面承载力验算 66

9.2 斜截面抗剪承载力验算 68

第十章 正常使用极限状态验算 70

10.1 抗裂验算 70

第十一章 持久状况和短暂状况应力验算 72

11.1 持久状况截面混凝土法向应力验算 72

11.2 短暂状态应力验算 72

第十二章 墩及桩基础设计与计算 75

12.1 支座 75

12.2 墩身设计与验算 77

12.3 承台设计 80

12.4 桩基础设计 80

第十三章 施工方案 83

参考文献 85

致 谢 86

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