【土木】湘江特大桥湘江主桥左幅

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土木 湘江 大桥 主桥
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摘要

该桥的设计,遵照“安全、适用、经济、美观”的基本原则,同时充分考虑了建造技

术的先进性以及环境保护和可持续发展的要求。主桥为三跨一联的预应力混凝土连续钢

构梁桥,桥梁全长 425m,跨径组合为 115m+195m+115m。每幅桥面净宽度为 0.5(护栏)

+3(人行道)+10.5(车道)+0.5(护栏)=15m。

主梁采用 C50 混凝土;预应力钢筋采用 ASTM A416-97a 标准的低松弛钢绞线(1×7

标准型)。桥梁施工采用悬臂施工方法,采用工程软件 Midas 进行计算分析,考虑了自

重、二期恒载、温度、支座沉降、车道荷载、施工阶段荷载等,进而考虑承载能力极限

有利、不利作用组合和正常使用状态的短期、长期作用组合。依照规范进行预应力钢筋

的估算,经过调整后使得结构不仅在成桥状态下符合规范要求,而且在各个施工阶段同

样满足。最后进行变形验算,通过检验符合规范要求。

该桥的设计分为三部分:1 . 桥型方案设计及比选;

2 . 上部结构设计及验算;

3 . 施工图设计。

关键字:变截面箱梁;设计;验算;悬臂施工;预应力混凝土

 湘江大桥湘江主桥左幅施工图设计

第 2 页

Design of main bridge of Xiangjiang bridge, bridge

construction plans

Summary

The bridge is designed in accordance with "safe, suitable, economic, aesthetic," the basic

principles, taking full account of the construction of advanced technology as well as

environmental protection and sustainable development. The main bridge is a joint three-span

continuous steel girder prestressed concrete bridge, bridge length of 425m, span combination

115m +195 m +115 m. Net width of each piece deck 0.5 (fence) +3 (sidewalk) +10.5 (lane)

+0.5 (guardrail) = 15m.

No. 50 concrete girders used; prestressed reinforced using ASTM A416-97a standard

low-relaxation strand (1 × 7 standard). Bridge construction cantilever construction method,

the use of engineering software Midas calculation and analysis, taking into account weight,

two dead load, temperature, support settlement, moving load, the construction phase loads,

etc., and then consider the carrying capacity limits beneficial and adverse effects of

combinations of normal use of state short-term, long-term effects combinations. Prestressing

steel in accordance with specifications estimates, and added prestressing steel load after

adjustments making the structure into a bridge, not only in the state meet regulatory

requirements, but also to meet the various construction stages. Finally, crack resistance,

compressive strength, deflection, etc. checking by verifying compliance.

The bridge's design is divided into three parts:

1. Bridge design and comparison;

2 superstructure design and checking;

3 construction design

Keywords: Variable Box Section; design; checking; cantilever construction; prestressed

concrete

 湘江大桥湘江主桥左幅施工图设计

第 3 页

目 录

1 设计资料------------------------------------------------------------------------------------------7

1.1 技术标准----------------------------------------------------------------------------------7

1.2 桥型设计---------------------------------------------------------------------------------7

1.3 材料规格---------------------------------------------------------------------------------7

1.4 设计计算依据----------------------------------------------------------------------------7

1.5 通航水位----------------------------------------------------------------------------------8

1.6 支座强迫位移及温度影响-------------------------------------------------------------8

1.7 基本计算数据----------------------------------------------------------------------------8

2 方案设计与比选------------------------------------------------------------ 9

2.1 工程概况-------------------------------------------------------------------------------9

2.2 方案设计--------------------------------------------------------------------------------9

2.3 方案比较------------------------------------------------------------------------------------12

3 截面尺寸拟定------------------------------------------------------------------------------------14

3.1设计特点--------------------------------------------------------------------------------------14

 3.1.1 设计特点-----------------------------------------------------------------------------15

 3.1.2 受力特点-----------------------------------------------------------------------------15

3.2 结构尺寸拟定------------------------------------------------------------------------------16

 3.2.1 主梁箱梁构造-----------------------------------------------------------------------16

 3.2.2 主梁截面尺寸拟--------------------------------------------------------------------16

3.3 毛截面几何特性计算---------------------------------------------------------------------17

4主梁作用效应计算--------------------------------------------------------------------------------19

4.1 结构自重作用效应计算-------------------------------------------------------------------19

 4.1.1结构单元划分----------------------------------------------------------------------20

 4.1.2施工阶段的模拟-------------------------------------------------------------------20

4.2 活载作用效应计算------------------------------------------------------------------------25

 4.2.1 汽车荷载标准值------------------------------------------------------------------25

 4.2.2 汽车冲击系数和箱梁横向分布系数------------------------------------------25

 湘江大桥湘江主桥左幅施工图设计

第 4 页

 4.2.3 人群荷载标准值------------------------------------------------------------------27

 4.2.4 温度应力及基础沉降内力计算------------------------------------------------30

4.3 内力组合------------------------------------------------------------------------------------34

 4.3.1 按承载能力极限状态设计-----------------------------------------------------36

 4.3.2 按正常使用极限状态设计-----------------------------------------------------39

5 预应力钢束估算及布置------------------------------------------------------------------------40

5.1 计算原理------------------------------------------------------------------------------------40

5.2 预应力筋估算结果------------------------------------------------------------------------41

5.3 预应力筋布置原则-------------------------------------------------------------------------51

5.4 调束以及预应力钢束布置情况---------------------------------------------------------52

6 预应力损失及有效预应力计算---------------------------------------------------------------53

 6.1 预应力损失计算---------------------------------------------------------------------------53

 6.2 有效预应力计算---------------------------------------------------------------------------56

7 配束后主梁的组合内力-------------------------------------------------------------------------59

8 截面强度验算------------------------------------------------------------------------------------61

8.1 基本理论------------------------------------------------------------------ 61

8.2 计算公式----------------------------------------------------------------------- 64

9 抗裂验算------------------------------------------------------------------------------------------73

9.1《公预规》要求------------------------------------------------------------------------------73

9.2 正截面抗裂验算---------------------------------------------------------------------------73

10 持久状况构件的应力验算-------------------------------------------------------------78

 10.1 正截面混凝土压应力验算-------------------------------------------------------------78

 10.2 预应力钢筋拉应力验算 ---------------------------------------------------------------79

 10.3 混凝土主压应力验算 -------------------------------------------------------------------88

11 短暂状态应力验算-----------------------------------------------------------------------------92

12 施工图绘制------------------------------------------------------------------------------------102

13 总体布置图------------------------------------------------------------------------------------103

参考文献----------------------------------------------------------------------------------------104

致谢-----------------------------------------------------------------------------------------------105

 湘江大桥湘江主桥左幅施工图设计

第 5 页

附件 1:开题报告

附件 2:原文及译文

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