68 110 68m变高度预应力混凝土连续箱梁桥设计

论文总字数：139506字

摘 要

本设计是根据设计任务书的要求和相关公路桥梁规范，对通榆河大桥上部结构进行复核性设计验算。通榆河大桥主桥上跨通榆河，航道等级规划为Ⅲ级航道，通航净空70x7m。主桥平面位于直线上，桥梁与航道中心线交叉角度为90°。

主桥上部结构为(68 110 68)m变高度预应力混凝土连续箱梁，由上下行分离的两个单箱单室截面组成。对上部结构进行复核性设计验算，利用Midas进行建模计算，主要分析了桥梁在使用中恒载以及活载的作用，对进行施工阶段和使用阶段主梁截面的强度和变形验算进行计算，并对本桥梁的施工工艺流程以及相关注意事项进行说明。

关键词：复核性设计；预应力混凝土；连续箱梁桥；Midas桥梁模型

Design of 68 110 68m Variable Height Prestressed Concrete Continuous Box Girder Bridge

ABSTRACT

The design checks the upper structure of Tongyuhe Bridge according to the requirements of the design task sheet and the relevant highway and bridge specifications. The main bridge of the Tongyu River Bridge spans the Tongyu River. The waterway grade is planned as Grade III waterway with a navigation clearance of 70x7m. The plane of the main bridge is located on a straight line, and the intersection angle between the bridge and the center line of the waterway is 90 degrees.

The superstructure of the main bridge is (68 110 68) m variable-height prestressed concrete continuous box girder, which consists of two single-box and single-chamber sections separated from the upstream and downstream. Check the design of the upper structure, use Midas to model and calculate, mainly analyze the role of dead load and live load in the use of the bridge, calculate the strength and deformation of the main girder section in the construction stage and the use stage, and explain the construction process of the bridge and the matters of concern.

Key Words : Review desig, Prestressed concrete, Continuous box girder bridge, Midas bridge model

目录

摘要........................................................................ Ⅰ

ABSTRACT.................................................................... Ⅱ

第一章、基本信息..............................................................1

1.1 工程概况..................................................................1

1.2 技术标准..................................................................1

1.3 主要规范..................................................................1

1.4 结构概述..................................................................2

1.5 主要材料及材料性能........................................................2

1.6 计算原则、内容及控制标准..................................................3

第二章、模型建立与分析........................................................4

2.1 计算模型..................................................................4

2.2 主要钢筋布置图及材料用表..................................................5

2.3 截面特性及有效宽度........................................................7

2.4 荷载工况及荷载组合.......................................................10

第三章、内力图...............................................................13

3.1 内力图...................................................................13

第四章、持久状况承载能力极限状态验算结果.....................................23

4.1 截面受压区高度...........................................................23

4.2 正截面抗弯承载能力验算...................................................23

4.3 斜截面抗剪承载能力验算...................................................23

4.4 抗扭承载能力验算.........................................................24

4.5 支反力计算...............................................................25

第五章、持久状况正常使用极限状态验算结果.....................................26

5.1 结构正截面抗裂验算.......................................................26

5.2 结构斜截面抗裂验算.......................................................26

第六章、持久状况构件应力验算结果.............................................28

6.1 正截面混凝土法向压应力验算...............................................28

6.2 正截面受拉区钢筋拉应力验算...............................................28

6.3 斜截面混凝土的主压应力验算...............................................29

第七章、短暂状况构件应力验算结果.............................................30

7.1 短暂状况构件应力验算.....................................................30

第八章、施工流程..............................................................31

第九章、结束语................................................................34

致谢................................................. .......................35

参考文献（References）........................................................36

附录............................................................ ............37

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