【土木】常德沅水四桥施工图设计

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编号:20171225094232718    类型:共享资源    大小:6.86MB    格式:RAR    上传时间:2017-12-25
  
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土木 常德 沅水四桥 施工图 设计
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摘要

本设计为湖南省常德市绕城高速,207 国道,沅水四桥大桥的共用桥梁的施工图设计。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:85m+135m+135m+135m+85m的五跨全预应力混凝土连续梁桥。主梁采用单箱单室截面,支点处梁高 9m,跨中梁高 3m,梁高按 2 次抛物线变化 ;

腹板为 40cm 至 70cm 的直线变化。主梁施工采用挂篮悬臂施工,边跨现浇段采用满堂支架施工方式。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 。按照规定,对该桥梁进行了正截面和斜截面的抗裂验算、持久状况构件的应力验算还有短暂状况构件的应力验算,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 :变截面连续梁、悬臂施工、Midas 软件

目录

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

1.1 概况..................................................................................................................................1

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

1.3 地形地貌.........................................................................................................................1

1.4 技术规范..........................................................................................................................1

1.5 方案比选..........................................................................................................................2

1.5.1 比选方案...........................................................................................................2

1.5.2 方案选定............................................................................................................3

2.结构尺寸拟定和材料选用.....................................................................................................5

2.1 结构尺寸..........................................................................................................................5

2.1.1 跨径布置................................................................................................................5

2.1.2 主梁截面形式及主要尺寸....................................................................................5

2.1.3 桥面铺装................................................................................................................6

2.1.4 桥面布置................................................................................................................6

2.2 主要材料..........................................................................................................................6

2.2.1 混泥土....................................................................................................................6

2.2.2 钢筋........................................................................................................................6

2.2.3 支座........................................................................................................................7

3.MIDAS 建模和内力计算..........................................................................................................8

3.1 建模..................................................................................................................................8

3.2 施工工艺........................................................................................................................11

3.3 荷载工况和荷载组合....................................................................................................12

3.3.1 自重荷载和二期恒载........................................................................................12

3.3.2 温度荷载............................................................................................................15

3.3.3 基础沉降............................................................................................................18

沅水四桥施工图设计

3.3.4 汽车荷载............................................................................................................20

3.4 荷载组合................................................................................................................22

4 预应力钢束的估算和布置....................................................................................................27

4.1 预应力钢束估算............................................................................................................27

4.2 预应力筋布置原则........................................................................................................29

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

6.持久状况承载能力极限状态验算.......................................................................................35

6.1 截面受压区高度...........................................................................................................35

6.2 正截面抗弯承载能力验算...........................................................................................36

6.3 斜截面抗剪承载能力验算...........................................................................................36

7.持久状况正常使用极限状态验算结果...............................................................................38

7.1 结构正截面抗裂验算...................................................................................................38

7.2 结构斜截面抗裂验算...................................................................................................38

8.持久状况构件应力验算结果...............................................................................................40

8.1 正截面混凝土法向压应力验算...................................................................................40

8.2 正截面受拉区钢筋拉应力验算...................................................................................40

8.3 斜截面混凝土的主压应力验算...................................................................................41

9、短暂状况构件应力验算结果.............................................................................................42

9.1 短暂状况构件应力验算...............................................................................................42

10 挠度验算和预拱度计算......................................................................................................43

10.1 挠度验算......................................................................................................................43

10.2 预拱度计算..................................................................................................................44

11.参考文献.............................................................................................................................46

12 设计总结及致谢..................................................................................................................47

沅水四桥施工图设计

13.附表..................................................................48

14.附件.................................................................112


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