【土木】沅水3#桥左幅桥施工图设计

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编号:20171225102151412    类型:共享资源    大小:3.94MB    格式:RAR    上传时间:2017-12-25
  
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土木 沅水 桥左幅桥 施工图 设计
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摘 要

本设计为沅水 3#桥左幅施工图设计。根据设计任务要求,依据现行公路桥梁设计规

范,综合考虑桥位的地质、地形条件,按“安全、适用、经济、美观”的桥梁设计原则、

进行了方案比选,最终确定该桥梁方案为: 75m+110m+75m 的三跨预应力混凝土连续

梁桥。桥宽 14m,单向三车道设计,荷载等级公路-I 级。主梁截面形式为变截面箱型梁,

采用单箱单室,主梁采用对称悬臂浇筑法施工。利用 MIDAS 计算软件分析桥梁主梁的

内力(包括恒载和活载的内力计算)和内力组合结果。根据结果,估算出纵向预应力筋的

数目,然后布置预应力钢筋。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。符合设计任务的要求。

关键词:预应力混凝土连续梁桥;悬臂施工;内力计算;配筋计算;强度验算;应力

验算

沅水 3#桥左幅施工图设计

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ABSTRACT

The design is about the left pieces of third Yuan River Bridge construction design

According to the design task requirements, based on the current highway bridge design

specifications, combined with "practical, economic, security, aesthetics," the bridge

design principles, It finally made the plan for the bridge:75m+110m+75 m three-span

prestressed concrete continuous beam bridge. The bridge width is14m, three-lane

one-way design, load grade is highway-I level. The main beam cross-section is the form

of variable cross-section box beam, single-box single room, the construction method of

main beam is symmetrical Cantilever . With the Midas software calculating internal force of bridge structure and internal

force combination, estimates for the prestressing tendons and configuration. According to

the regulation of the public beforehand gauge, on the strength of cross section and

checking calculation of the bridge, anti-crack calculation and lasting component of the

deflection and stress check calculation condition, calculation results show that the design

is reasonable, various properties of the bridge can meet the requirements in design period.

Key words: Cantilever construction; prestressed concrete continuous girder bridge;

Reinforcement calculation; Internal force calculation; Stress

check ;Strength calculation;

沅水 3#桥左幅施工图设计

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目 录

中文摘要

英文摘要

1 方案比选...............................................................................................................................1

1.1 设计依据.......................................................................................................................1

1.2 设计条件.......................................................................................................................1

1.3 桥型方案.......................................................................................................................1

2 基本设计资料.......................................................................................................................5

2.1 工程建设背景介绍.......................................................................................................5

2.2 工程主要技术标准.......................................................................................................5

2.3 计算依据.......................................................................................................................5

2.4 主要材料.......................................................................................................................5

2.5 设计要点.......................................................................................................................7

2.5.1 整体布置 ........................................................................................................ 7

2.5.2 上部结构设计 ................................................................................................ 7

2.5.3 下部结构设计.................................................................................................. 8

2.6 施工要点.......................................................................................................................8

2.6.1 下部结构施工 ................................................................................................ 8

2.6.2 上部结构施工 ................................................................................................ 8

2.7 几何特性计算 ...........................................................................................................10

2.7.1 基本资料 ...................................................................................................... 10

2.7.1.1 主要技术指标 .............................................................................10

2.7.1.2 材料规格 .....................................................................................10

2.7.2 结构计算简图 .............................................................................................. 11

沅水 3#桥左幅施工图设计

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2.7.3 毛截面几何特性计算 .................................................................................. 11

3 内力计算及组合.................................................................................................................12

3.1 荷载介绍 ...................................................................................................................12

3.1.1 结构重力荷载 .............................................................................................. 12

3.1.2 支座不均匀沉降 .......................................................................................... 12

3.1.3 移动荷载 ...................................................................................................... 14

3.1.4 温度荷载 ...................................................................................................... 16

3.2 荷载组合

3.3 内力计算结果 ................................................................................................................18

3.2.1 承载能力极限状态内力计算及结果 .......................................................... 18

3.2.2 正常使用极限状态内力计算及结果 .......................................................... 21

4 预应力钢束的计算及布置.................................................................................................25

4.1 预应力钢筋面积的估算.............................................................................................25

4.2 预应力筋估算结果 ...................................................................................................26

4.3 预应力筋束的布置原则.............................................................................................29

4.4 预应力筋束的布置结果.............................................................................................30

5 预应力损失计算.................................................................................................................31

5.1 摩阻损失的计算.........................................................................................................31

5.2 锚具变形、钢束回缩损失的计算 ...........................................................................32

5.3 混凝土的弹性压缩损失的计算 ...............................................................................32

5.4 预应力筋束松弛损失的计算 ...................................................................................32

5.5 混凝土收缩、徐变损失的计算 ................................................................................33

5.6 钢束组应力损失结果.................................................................................................33

6 结构强度与抗裂验算.........................................................................................................36

6.1 配束后荷载组合作用下内力计算结果.....................................................................36

6.1.1 配束后承载能力极限状态下内力计算结果................................................ 36

6.1.2 配束后正常使用极限状态下内力计算结果................................................ 38

沅水 3#桥左幅施工图设计

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6.2 强度验算 ...................................................................................................................40

6.2.1 基本理论......................................................................................................... 40

6.2.2 验算过程........................................................................................................ 40

6.3 抗裂验算.....................................................................................................................52

6.3.1 规范要求........................................................................................................ 52

6.3.2 正截面抗裂验算 .......................................................................................... 53

6.3.3 斜截面抗裂验算 .......................................................................................... 56

7 正常使用极限状态验算.....................................................................................................60

7.1 短暂状况构件的应力验算.........................................................................................60

7.2 持久状况下正应力验算.............................................................................................65

7.2.1 正截面混凝土压应力验算 ........................................................................... 65

7.2.2 混凝土主压力验算...................................................................................... 68

7.2.3 预应力筋拉应力验算.....................................................................................71

7.3 变形计算 ...................................................................................................................75

7.3.1 恒荷载作用下变形计算结果 ...................................................................... 75

7.3.2 移动荷载作用下变形计算结果.................................................................... 77

7.4.3 荷载长期效应作用下中跨主梁挠度验算 .................................................. 78

7.4.4 荷载长期效应作用下边跨主梁挠度验算 .................................................. 79

7.5 预拱度设计 ...............................................................................................................79

8 施工图绘制.........................................................................................................................80

8.1 概述 ............................................................................................................................80

8.2 桥型总体布置图 .......................................................................................................80

8.3 上、下部结构一般结构图.........................................................................................80

8.4 主梁预应力钢束布置图 ...........................................................................................80

8.5 桩基结构图 ...............................................................................................................81

8.6 支座结构图 ...............................................................................................................81

8.7 泄水管布置及结构图 ...............................................................................................81

8.8 伸缩的缝结构图 .......................................................................................................81

沅水 3#桥左幅施工图设计

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8.9 防撞栏一般结构图.....................................................................................................81

8.10 施工程序示意图.......................................................................................................81

设计总结...................................................................................................................................82

主要参考文献...........................................................................................................................83

致谢...........................................................................................................................................84

附件一:开题报告

附件二:外文文献译文及原文

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