论文总字数：47722字

摘 要

本设计根据设计任务书要求和《公路桥涵设计手册》的规定,对浦仪过江通道西引桥第二联右幅进行方案设计。连续梁桥是工程中广泛使用的一种桥型,它不仅具有可靠的强度,抗裂性及刚度,而且还有养护工作量小，行车舒适平稳,设计和施工经验成熟等特点。本课题所依托的工程为浦泗立交无锡至南京二桥段（浦仪公路西段）跨江大桥工程西引桥当中的第二联右幅。上部结构为变截面预应力混凝土连续梁桥，桥面等宽，宽度18m。跨径185m，下部结构采用钢筋混凝土桥墩。下部结构用钻孔灌注桩，支座用盆式橡胶支座。该设计首先用MIDAS进行活载、恒载及温度次内力的计算,然后进行荷载组合,绘制剪力和弯矩包络图；其次,根据频域值效应组合配置预应力筋束，并进行预应力损失等计算；最后，对该梁桥进行验算，通过计算可以验证该桥各项指标都满足要求。

关键词：连续梁桥 满堂支架 MIDAS

Design of Prestressed Continuous Girder Bridge of West Approach Bridge of Puyi River Crossing

【Abstract】Based on the requirements of the design mission book and the provisions of the "Handbook of highway bridges and culverts," this design will compare and select the west approach bridge of the Puyi River Crossing. The continuous beam bridge is a kind of bridge widely used in the project. It not only has reliable strength, crack resistance and rigidity, but also has the characteristics of small maintenance workload, comfortable and steady running, and mature design and construction experience.The project supported by this project is the second right-hand section of the west approach bridge between the WuxiNanjing Second Bridge section (the west section of Puyi Highway) and the west approach bridge. The superstructure is a variable-section prestressed concrete continuous beam bridge with a width of 18m. With a span of 185m, reinforced concrete piers are used for the substructure and cast-in-place pile foundations are used for the foundation.Drilled cast-in-place piles for substructures and potted rubber bearings for bearings. The design first uses MIDAS to calculate the live load, dead load, and temperature internal forces, and then performs the load combination to draw the shear and bending moment envelopes. Second, the prestressed tendons are combined and preset according to the frequency domain value effect. Calculation of stress loss; Finally, the bridge is checked and calculations can verify that all the indicators of the bridge meet the requirements.

【Key Words】 continuous bridge; Full House Scaffolding;MIDAS

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 3

第二章 恒载计算 6

2.1 节段划分及截面几何要素计算 6

2.2 一期恒载计算 7

2.3 二期恒载计算 9

2.4 总恒载计算 9

第三章 活载计算 13

3.1 汽车荷载 13

3.2 最大、最小弯矩计算 15

3.3 最大、最小剪力计算 18

第四章 温度次内力计算 23

4.1 温度次内力计算 23

4.2 支座沉降次内力计算 26

第五章 内力组合及内力包络图 29

5.1 频域值组合 29

5.2 准永久值组合 30

5.3 基本组合 31

5.4 包络图 32

第六章 预应力筋的计算与布置 35

6.1 原理与方法 35

6.2 预应力筋的配置 35

6.3 钢束布置 38

第七章 净截面及换算截面几何特性计算 48

7.1 概述 48

7.2 净截面几何性质计算 48

7.3 换算截面性质计算 51

第八章 预应力损失及有效预应力计算 53

8.1 控制应力及有关参数计算 53

8.2 摩擦损失 54

8.3 锚具回缩损失 58

8.4 弹性压缩损失 64

8.5 应力松弛损失 65

8.6 收缩徐变损失 66

8.6 预应力损失组合及有效预应力计算 68

第九章 承载能力极限状态验算 71

9.1 正截面承载力验算 71

9.2 斜截面抗剪承载力验算 74

第十章 正常使用极限状态验算 77

10.1 抗裂验算 77

第十一章 持久状况与短暂状况应力验算 80

11.1 持久状况截面混凝土法向应力验算 80

11.2 短暂状态应力验算 80

第十二章 墩及桩基础设计与计算 84

12.1 支座 84

12.2 墩身设计与验算 85

第十三章 工程量计算 91

13.1 工程量清单 91

参考文献 92

致 谢 93

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