30m 30m现浇预应力混凝土箱梁桥设计

论文总字数：35020字

摘 要

Abstract..................................................................Ⅱ

1. 设计基本资料.......................................................1

1.1 跨度和桥面宽度..................................................1

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

1.3 主要材料..........................................................1

1. 箱形梁构造形式及相关设计参数.......................................1
2. 主梁作用效应计算...................................................4

3.1 永久作用效应计算..................................................4

3.2 可变作用效应计算..................................................6

3.3 主梁作用效应组合.................................................14

1. 预应力钢束的估算及其布置..........................................15

4.1 预应力钢束数量的估算.............................................15

4.2 预应力钢束布置...................................................16

1. 计算主梁截面几何特性..............................................21

5.1 截面面积及惯性矩计算.............................................21

5.2 截面静矩计算.....................................................21

5.3 截面几何特性总表.................................................25

1. 钢束预应力损失计算................................................26

6.1 预应力钢束与管道壁间的摩擦损失...................................26

6.2 由锚具变形、钢束回缩引起的预应力损失.............................27

6.3 混凝土弹性压缩引起的预应力损失...................................28

6.4 由钢束应力松弛引起的预应力损失...................................28

6.5 混凝土收缩和徐变引起的预应力损失.................................30

6.6 成桥后四分点截面由张拉钢束产生的预加力作用效应计算...............31

6.7 预加力损失汇总及预加力计算.......................................32

1. 承载能力极限状态计算..............................................34

7.1 跨中截面正截面承载力计算.........................................34

7.2 验算最小配筋率...................................................36

7.3 斜截面抗剪承载力计算.............................................37

1. 持久状况正常使用极限状态抗裂性验算................................40

8.1 正截面抗裂性验算.................................................40

8.2 斜截面抗裂性验算.................................................41

1. 持久状况构件的应力计算.............................................46

9.1 正截面混凝土法向压应力验算........................................46

9.2 预应力筋拉应力验算................................................47

9.3 斜截面混凝土主压应力验算..........................................49

1. 短暂状况构件的应力验算.............................................53

10.1 预加应力阶段的应力验算...........................................53

1. 主梁端部的局部承压验算...........................................54

11.1 局部承压区的截面尺寸验算.........................................54

11.2 局部抗压承载力验算...............................................55

1. 主梁变形验算.....................................................56

12.1 计算由预加力引起的跨中反拱度.....................................56

12.2 计算由荷载引起的跨中挠度.........................................57

12.3 结构刚度验算.....................................................58

12.4 预拱度的设置.....................................................58

结论.......................................................................59

参考文献...................................................................60

摘要

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