【土木】荆沙长江公路大桥南岸引桥施工图设计

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土木 长江 公路 大桥 南岸 引桥 施工图 设计
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摘 要

本设计为荆沙长江公路大桥南岸引桥施工图设计。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:5×54m 的五跨全预应力混凝土连续梁桥。

主梁采用单箱单室截面,梁高 3.0m;主墩采用 D130cm 的圆形实体墩。主梁施工采

用支架法施工,一次落架成桥。

采用桥梁博士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等,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:连续梁桥;等截面;圆形实体墩;桥梁博士软件

荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥施工图设计

THE CONSTRUCTION CONSTRUCTION CONSTRUCTION CONSTRUCTION DESIGN OF THE SOUTH APPROACH APPROACH APPROACH APPROACH

BRIDGE OF JINGSHA JINGSHA JINGSHA JINGSHAYANGTZE YANGTZE YANGTZE YANGTZE RIVER HIGHWAY HIGHWAY HIGHWAY HIGHWAYBRIDGE

ABSTRACT ABSTRACT ABSTRACT ABSTRACT

This design is The construction design of the south approach bridge of Jingsha Yangtze

River highway bridge. According to the data of design and requestion provided by the design

agency and the present Specifications of Highway Bridge, combining with the principles of

bridge design which is “utility, safety, beauty, economy”, I confirm that the bridge is a

five-span prestressed concrete continual beam bridge with the spans of 5×54m.

The beam is designed to a single cell box girder, the height of beam is 3.0m.The pier is

designed to be solid pier with the diameter of 130cm. The main beam is built with Full

Framing Method.

To get the internal force of the structures and the composition of internal force, I use

Bridge Doctor software. With the help of it, we can evaluate the amount of prestressed

reinforcement and distribute them to the bridge. According to Code for Design of Highway

Reinforce and Prestressed concrete Bridges and Culverts , we have to check the structure

including 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 shows that the design is up to

the assignment.

Key words: Continuous beam bridge; Cross section; Solid pier; Bridge Doctor software

荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥施工图设计

目 录

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........................................................................................................................... 1

2 结构尺寸拟定和材料选用...................................................................................................... ...................................................................................................... ...................................................................................................... ......................................................................................................7

2.1 结构尺寸的拟定............................................................................................................... 7

2.2 主要材料........................................................................................................................... 8

3 结构内力计算........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................10

3.1 有限元建模.................................................................................................................... 10

3.2 恒载作用下的内力值..................................................................................................... 12

3.3 汽车荷载内力计算......................................................................................................... 14

3.4 温度内力计算................................................................................................................ 22

3.5 基础沉降内力计算........................................................................................................ 24

3.6 荷载组合........................................................................................................................ 25

4 预应力钢束的估算及布置.................................................................................................... .................................................................................................... .................................................................................................... ....................................................................................................31

4.1 预应力钢筋数量估算..................................................................................................... 31

4.2 预应力钢束的布置........................................................................................................ 35

5 预应力损失计算.................................................................................................................... .................................................................................................................... .................................................................................................................... ....................................................................................................................36

6 截面强度验算........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................42

7 抗裂验算................................................................................................................................ ................................................................................................................................ ................................................................................................................................ ................................................................................................................................44

7.1 正截面抗裂验算............................................................................................................. 44

7.2 斜截面抗裂验算............................................................................................................. 45

8 持久状况构件的应力验算.................................................................................................... .................................................................................................... .................................................................................................... ....................................................................................................47

荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥 荆沙长江公路大桥南岸引桥施工图设计

8.1 正截面混凝土压应力验算............................................................................................. 47

8.2 预应力钢筋拉应力验算................................................................................................. 47

8.3 混凝土主压应力验算..................................................................................................... 47

9 短暂状态应力验算................................................................................................................ ................................................................................................................ ................................................................................................................ ................................................................................................................49

10 挠度验算和预拱度计算...................................................................................................... ...................................................................................................... ...................................................................................................... ......................................................................................................50

10.1 挠度验算....................................................................................................................... 50

10.2 预拱度计算................................................................................................................... 51

10.3 结合桥梁博士进行计算...............................................................................................51

11 设计特点.............................................................................................................................. .............................................................................................................................. .............................................................................................................................. ..............................................................................................................................54

参考文献................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ...................................................................................................................................55

设计总结与致谢....................................................................................................................... ....................................................................................................................... ....................................................................................................................... .......................................................................................................................56

附录...........................................................................................................................................57 ...........................................................................................................................................57 ...........................................................................................................................................57 ...........................................................................................................................................57

附录 A....................................................................................................................................57

附录 B....................................................................................................................................59

附录 C....................................................................................................................................65

附录 D....................................................................................................................................68

附件 1 开题报告(文献综述)

附件 2 译文及原文影印件

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