【土木】寨阳高架桥施工图设计

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土木 阳高 架桥 施工图 设计
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摘 要

本设计为吉首至茶洞高速公路第三合同段寨阳大桥施工图设计。根据设计任务书提

供的设计资料与要求,依据现行公路桥梁设计规范,结合“实用、经济、安全、美观”的

桥梁设计原则,确定该桥梁方案为:78m+140m+78m 的三跨全预应力混凝土连续刚构

桥。

主梁采用单箱单室截面,根部高 8.0m,跨中高 3.0m,梁高按二次抛物线变化;主

墩采用双肢薄壁墩,宽 6.4m,厚度 2.0m,墩高 44m。主梁施工采用对称悬臂现浇,边

跨采用满堂支架施工。

采用 Midas 软件计算桥梁结构的内力及内力组合,进行预应力钢筋的估算与配置。

根据《公预规》的规定,对该桥梁进行了截面强度验算、抗裂验算、持久状况构件的应

力验算和挠度验算,验算结果表明该设计是合理的,该桥梁的各项性能在设计年限内均

能满足的要求。

关键词:连续刚构桥;二次抛物线;双肢薄壁墩;Midas 软件

寨阳高架桥施工图设计 寨阳高架桥施工图设计 寨阳高架桥施工图设计 寨阳高架桥施工图设计

II

THE CONSTRUCTION CONSTRUCTION CONSTRUCTION CONSTRUCTION DESIGN OF

ZHAI YANG BRIDGE

ABSTRACT

The design for the contract segment the Zhai Yang Bridge Jishou to Chadong

Expressway construction design. According to the data of design and request provided by the

design assignment and the present Specifications of Highway Bridge, combining with the

principia of bridge design that is “utility, economy, safety, beauty” confirm that the bridge is a

three -span prestressed concrete continual rigid frame bridge ,which the span is

78m+140m+78m.

The beam is designed to a single cell box girder, the depth of beam at pier is 8.0m, and

3.0m at mid-span, the depth is changed by parabola with power of 2. The pier is designed to

twin-limb thin pier, the width is 6.4m and the thickness is 2.0m, the depth of the pier is 44m.

Using the cast-in-cantiever to construct the beam and the full support to fold the side span.

Using Midas software is to get the internal force of the structures and the composition

of internal force. For this, we can evaluate the amount of longitudinal tendons and distribute

the tendons to the bridge. According to Code for Design of Highway Reinforce and

Prestressed concrete Bridges and Culverts we deed some checking, that includes the

load-caring capacity ultimate state and the normal service ability ultimate state as well as the

main section’s being out of shape. The conclusion can be drawn that the design is up to the

assignment.

Key words: continual rigid frame bridge; parabola with power of 2;

cast-in-cantiever; Midas software

寨阳高架桥施工图设计 寨阳高架桥施工图设计 寨阳高架桥施工图设计 寨阳高架桥施工图设计

III

目 录

摘 要...............................................................................................................................................I

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

目 录............................................................................................................................................ III

1 概况与方案比选...........................................................................................................................1

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

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

1.3 技术规范................................................................................................................................ 1

1.4 方案比选................................................................................................................................ 2

2 结构尺寸拟定和材料选用..........................................................................................................6

2.1 结构尺寸的拟定....................................................................................................................6

2.2 主要材料................................................................................................................................ 7

3 结构内力计算...............................................................................................................................9

3.1 有限元建模........................................................................................................................... 9

3.2 恒载作用下的内力值..........................................................................................................11

3.3 汽车荷载内力计算..............................................................................................................13

3.4 温度内力计算.....................................................................................................................17

3.5 基础沉降内力计算.............................................................................................................20

3.6 荷载组合............................................................................................................................. 23

4 预应力钢束的估算及布置.............................................................................错误!未定义书签。

4.1 预应力钢筋数量估算......................................................................................................... 34

4.2 预应力钢束的布置.............................................................................................................39

5 预应力损失计算.........................................................................................................................41

6 配束后的内力组合.................................................................................................................... 47

6.1 承载能力极限状态组合..................................................................................................... 47

6.2 短期作用组合......................................................................................................................49

6.3 长期作用组合......................................................................................................................52

7 截面强度验算.......................................................................................................................57

7.1 主梁正截面强度验算......................................................................................................... 56

7.2 主梁斜截面强度验算.....................................................................................................60

8 抗裂验算.....................................................................................................................................60

8.1 正截面抗裂验算..................................................................................................................60

8.2 斜截面抗裂验算..................................................................................................................61

9 持久状况构件的应力验算........................................................................................................64

寨阳高架桥施工图设计 寨阳高架桥施工图设计 寨阳高架桥施工图设计 寨阳高架桥施工图设计

IV

9.1 正截面混凝土压应力验算................................................................................................. 64

9.2 预应力钢筋拉应力验算..................................................................................................... 65

9.3 混凝土主压应力验算......................................................................................................... 66

10 短暂状态应力验算................................................................................................................. 69

11 挠度验算和预拱度计算.......................................................................................................... 71

11.1 挠度验算............................................................................................................................ 71

11.2 预拱度计算........................................................................................................................ 72

设计总结与致谢............................................................................................................................74

参考文献........................................................................................................................................ 75

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