35.5 48 35.5m预应力砼连续箱梁设计

论文总字数：134952字

摘 要

设计根据毕业设计任务书的要求以及公路桥规的规定对无锡市内环西线某桥进行方案设计。该桥为预应力混凝土变截面连续箱梁，根据任务书的要求和设计规范的规定，主要对其进行上部结构的设计。

该预应力混凝土变截面连续箱梁跨径组合为（35.5 48 35.5）m，采用单箱单室截面，箱梁顶宽 12.70m，桥梁设计荷载为公路－Ⅰ级，结构设计安全等级为一级。

本次设计依据《公路工程技术标准》(JTG B01-2003)、《公路桥涵设计通用规范》 (JTG D60-2004)《公路钢筋混凝土及预应力混凝土桥涵设计规范》 (JTG D62-2004)计算各种作用效应以及荷载组合，采用了Midas Civil软件对桥梁的恒载以及活载进行分析验算。并依据结果进行正截面与斜截面抗弯、抗扭承载能力验算，正截面与斜截面抗裂验算，正截面与斜截面抗弯承载能力验算以及应力的验算，结果表明该结构满足各项构造强度要求。

关键词：预应力混凝土；连续箱梁；单箱单室；变截面高度； Midas Civil；

ABSTRACT

According to the requirements of the graduation project and the regulations of road and bridge, the design scheme of a bridge on the west inner ring road of wuxi city is designed. The bridge is a continuous box girder with variable section of prestressed concrete.

The combination of prestressed concrete variable cross-section continuous box girder span for (48 35.5 35.5) m, with single box section, 8 box girder is 12.70 m, for highway bridge design load level - Ⅰ, security level for structure design level.

According to highway engineering technical standards (JTG b01-2003), general code for design of highway bridge and culvert (JTG d60-2004) and code for design of highway reinforced concrete and prestressed concrete bridge and culvert (JTG d62-2004), various effects and load combinations were calculated. Midas Civil software was used to analyze and check the dead load and live load of the bridge. According to the results, the flexural and torsional bearing capacities of normal section and inclined section, the crack resistance of normal section and inclined section, the flexural bearing capacities of normal section and inclined section and the stress are checked.

Key Words: prestressed concrete; Continuous box girder; Single box single room; Variable section height; Midas Civil;

目录

摘要··········································Ⅰ

Abstract········································Ⅱ

第一章 设计概述·····································1

1.1 工程概述····································1

1.2 工程地质····································1

1.3 技术标准与设计规范·······························1

1.4 主要材料及力学指标·······························1

1.4.1 混凝土··································1

1.4.2 预应力钢筋································1

1.4.3 普通钢筋·································2

1.5 结构计算相关参数································2

1.6 计算原则、内容及控制标准····························2

第二章 方案选择·····································3

2.1概述 ······································3

2.2方案比较 ····································3

第三章 荷载组合 ····································5

3.1计算模型简介 ··································5

3.2 桥梁截面形式 ··································5

3.3 主梁单元划分··································6

3.3.1 划分单元原则·······························6

3.3.2 桥梁具体单元划分·····························7

3.4 截面特征影响的要素·······························7

3.5 截面变化情况··································7

3.6. 施工阶段····································7

3.7. 成桥阶·····································8

3.8截面特性及有效宽度·······························18

3.8.1截面特性·································18

3.8.2荷载工况及荷载组合····························22

第四章 内力计算 ····································29

4.1恒载内力计算··································29

4.2活载内力计算··································29

4.2.1 影响线的计算 ······························29

4.2.2 活载因子的计算 ·····························29

4.3其他因素引起的内力计算·····························31

4.3.1 温度引起的内力计算···························31

4.3.2 温度梯度引起的内力计算·························32

4.4内力图 ····································33

第五章、持久状况承载能力极限状态验算结果 ·······················36

5.1截面受压区高度·································36

5.2 正截面抗弯承载能力验算 ····························36

5.3 斜截面抗剪承载能力验算·····························36

5.4 抗扭承载能力验算 ·······························37

5.5 支反力计算 ··································37

第六章 持久状况正常使用极限状态验算结果························39

6.1 结构正截面抗裂验算 ······························39

6.2 结构斜截面抗裂验算 ······························39

第七章 持久状况构件应力验算结果····························41

7.1 正截面混凝土法向压应力验算 ··························41

7.2 正截面受拉区钢筋拉应力验算 ··························41

7.3 斜截面混凝土的主压应力验算 ··························41

第八章 短暂状况构件应力验算结果····························43

8.1 短暂状况构件应力验算 ·····························43

致谢 ·········································44

参考文献 ·······································45

附录·········································46

1. 设计概述

1.1 工程概述

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