论文总字数：70160字

摘 要

此次课题研究，主要是关于盐邵河大桥的主桥设计问题。在结构的规划上，考虑为三跨变预应力连续箱梁，设计的跨径数值为（50 85 50）m，同时设计为单箱单室截面，桥梁全宽26m，上下行双幅桥设计，单幅桥宽12.75m。按照《公路桥涵设计通用规范JTG D60-2015》等文件中的精神、标准，以及当地的一些项目规定文件，从而全面保障实施到位。通过所学过的基础理论及专业知识，并结合实际情况，进行桥梁上部结构验算分析。利用桥梁博士围绕方案创建相应的模型，同时输入材料特征方面的结构数据。随后按照项目图纸，进而明确不同截面对应的钢筋区域大小，设计对应的钢束，再进行施工、运营分析。可以根据桥梁博士输出的内力、应力计算组合和强度、抗裂验算等报告整理计算书。结果表明主梁结构满足设计要求。

关键词：连续梁桥；变截面；桥梁博士；结构设计

Main bridge design of Yanshao River Bridge

Abstract

This research is mainly about the design of the main bridge of Yanshao River Bridge. In the structural planning, it is considered to be a three span variable prestressed continuous box girder, the design span value is (50 85 50) m, and it is also designed as a single box and single chamber section, with the full width of 26m, and the design of up and down double span bridge, with the width of 12.75m. According to the spirit and standards of general specification for design of highway bridges and culverts JTG d60-2015 and other documents, as well as some local project regulations, the implementation is fully guaranteed. Through the basic theory and professional knowledge, and combined with the actual situation, the bridge superstructure checking analysis. Using the bridge doctor to create the corresponding model around the scheme, and input the structural data of material characteristics at the same time. Then, according to the project drawings, the size of reinforcement area corresponding to different sections is defined, the corresponding steel tendons are designed, and then the construction and operation analysis are carried out. The calculation sheet can be arranged according to the internal force, stress calculation combination, strength, crack resistance calculation and other reports output by the bridge doctor. The results show that the main girder structure meets the design requirements.

Key words: continuous girder bridge; Variable cross-section; Bridges, Dr；Structural design

目 录

1. 引言···································1

1.1 我国桥梁工程的发展·························· 1

1.2 预应力混凝土连续箱梁桥概述······················ 1

1.3 毕业设计的目的与意义························· 1

第二章 设计基本资料与主要技术指标························2

2.1 工程概况······························· 2

2.2 设计技术指标····························· 2

2.3 有关设计资料····························· 2

2.4 设计规范······························· 2

第三章 桥跨总体布置及主梁截面尺寸拟定······················4

3.1 尺寸拟定······························· 4

3.1.1 桥孔分跨···························· 4

3.1.2 截面形式···························· 4

3.1.3 梁高······························ 4

3.1.4 细部尺寸···························· 5

3.2 主梁分段和施工阶段的划分······················· 6

3.2.1 分段原则···························· 6

3.2.2 具体分段···························· 6

3.2.3 主梁施工方法及注意事项····················· 7

第四章 荷载内力计算······························ 9

4.1 恒载内力计算····························· 9

4.2 活载内力计算····························· 9

4.3 次内力计算······························ 9

4.3.1混凝土收缩徐变························· 9

4.3.2 温度内力计算·························· 9

4.3.3 不均匀沉降计算·························10

4.4 内力组合·······························10

4.4.1 作用及作用效应组合·······················10

4.4.2 内力组合结果··························10

第五章 预应力钢束布置····························· 14

5.1 钢束布置······························ 14

5.2 预应力损失····························· 17

第六章 截面验算及其计算结果·························· 18

6.1 持久状况承载能力极限状态计算·····················18

6.1.1 最大弯矩····························18

6.1.2 最小弯矩····························18

6.1.3 最大剪力····························18

6.1.4 最小剪力····························19

6.1.5 标准值组合支座反力·······················19

6.2 持久状况正常使用极限状态计算·····················19

6.2.1 频遇组合下正截面抗裂验算····················19

6.2.2 挠度验算····························24

6.3 持久状况构件应力计算·························30

6.3.1 混凝土法向应力·························30

6.3.2 混凝土主应力··························35

6.3.3 预应力钢筋应力·························40

6.4 短暂状况构件应力计算·························42

6.4.1 最大应力验算··························42

6.4.2 最小应力验算··························62

第七章 结语·································· 83

致谢······································84

参考文献····································85

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