【土木】娄底至新化公路资水大桥西引桥施工图设计

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土木 娄底 新化 公路 大桥 引桥 施工图 设计
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目录

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

1.1 设计标准及设计规范................................................................................................1

1.2 主要设计标准............................................................................................................1

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

1.4 施工方式....................................................................................................................2

1.5 设计要点...................................................................................................................2

1.6 其他事项...................................................................................................................2

2 设计要点及结构尺寸拟定.............................................................................................3

2.1 设计要点...................................................................................................................3

2.2 结构尺寸拟定...........................................................................................................3

2.2.1 主梁片数与主梁间距.....................................................................................3

2.2.2 主梁结构尺寸拟定.........................................................................................3

2.2.3 检验截面效率指标ρ........................................................................................5

2.3 横向分布系数计算....................................................................................................6

2.3.1 冲击系数和车道折减系数.............................................................................6

2.3.2 计算主梁的荷载横向分布系数.....................................................................6

3 内力计算及组合.............................................................................................................10

3.1 荷载.........................................................................................................................10

3.1.1 结构自重作用荷载集度计算.......................................................................10

3.1.2 支座不均匀沉降...........................................................................................10

3.2 内力计算.................................................................................................................10

3.2.1 边梁第一施工阶段结构自重作用效应内力...............................................11

3.2.2 边梁第三施工阶段结构自重作用效应内力...............................................12

3.2.3 边梁第四施工阶段结构自重作用效应内力...............................................14

3.2.4 边梁结构自重作用效应总内力计算...........................................................15

娄底至新化公路资水大桥西引桥施工图设计

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3.3 汽车荷载作用效应计算.........................................................................................17

3.4 温差应力及基础沉降内力计算.............................................................................19

3.4.1 温差应力.......................................................................................................19

3.4.2 基础沉降.......................................................................................................20

3.5 内力组合.................................................................................................................22

3.5.1 按承载能力极限状态进行内力组合...........................................................22

3.5.2 按正常使用极限状态进行内力组合...........................................................24

4 预应力钢束的估算及布置.............................................................................................27

4.1 估算原理.................................................................................................................27

4.2 预应力筋估算结果.................................................................................................27

4.3 预应力筋的布置原则.............................................................................................29

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

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

4.5.1 预应力筋与孔道壁之间摩擦引起的应力损失...........................................31

4.5.2 锚具变形、钢筋回缩引起的应力损失.......................................................32

4.5.3 钢筋与台座间的温度引起的损失...............................................................32

4.5.4 混凝土弹性压缩引起的应力损失...............................................................32

4.5.5 预应力钢筋松弛引起的损失.......................................................................33

4.5.6 混凝土收缩徐变引起的应力损失...............................................................33

5 截面强度验算.................................................................................................................38

5.1 基本理论..................................................................................................................38

5.2 计算公式.................................................................................................................38

6 抗裂验算...........................................................................................................................40

6.1 规范要求.................................................................................................................40

6.1.1 正截面抗裂验算...........................................................................................40

6.1.2 斜截面抗裂验算...........................................................................................41

7 持久状况构件的应力验算...............................................................................................43

7.1 计算内容及原理.....................................................................................................43

7.1.1 正截面混凝土压应力验算...........................................................................43

娄底至新化公路资水大桥西引桥施工图设计

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7.1.2 预应力钢筋拉应力验算...............................................................................43

7.1.3 混凝土主压应力验算...................................................................................44

7.2 计算结果.................................................................................................................44

8 变形验算与预拱度计算.....................................................................................................49

8.1 预加力引起的上拱度.............................................................................................49

8.2 使用荷载作用下的挠度.........................................................................................50

8.2.1 中跨跨中挠度验算.......................................................................................51

8.2.2 边跨跨中挠度验算.......................................................................................51

8.3 预应力混凝土受弯构件的总挠度.........................................................................51

8.4 预拱度的设置.........................................................................................................52

参考文献...................................................................................................................................53

致谢...........................................................................................................................................54


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