【土木】木蓬特大桥主桥施工图设计

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土木 木蓬特 大桥 主桥 施工图 设计
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摘 要

本毕业设计主要是关于预应力混凝土连续梁桥上部结构的设计。本次毕业设计的必选方案有三个,经过地质条件、经济和美观筛选,最终确定为跨度为(65+120+65)m的变截面连续梁桥。本次毕业设计进行了方案比选、截面尺寸拟定、Midas 建模、恒活载计算、内力组合、纵向预应力配筋和截面验算。本次设计桥梁分为双福,单幅为单箱单室,桥面总宽 31m,双向 6 车道,上下行。主梁施工采用悬臂挂篮施工,对称平衡浇筑混凝土。

关键词 :预应力混凝土连续箱梁桥;悬臂施工;内力计算;活载计算;内力组合;截

面验算

目 录

1 绪 论 ········································································································ 1

1.1 预应力混凝土连续梁桥概述 ............................................................................... 1

1.2 毕业设计的目的与意义 ....................................................................................... 3

2 设计说明 ··································································································· 4

2.1 概述 ....................................................................................................................... 4

2.2 设计原始依据及基本设计要求 ........................................................................... 4

2.3 主要材料 ............................................................................................................... 4

2.4 桥面铺装 ............................................................................................................... 5

2.5 施工方法 ............................................................................................................... 5

2.6 材料各项基本数据与限制 ................................................................................... 5

2.7 设计规范 ............................................................................................................... 6

2.8 支座沉降 ............................................................................................................... 6

2.9 其他事项 ............................................................................................................... 6

3 方案比选 ··································································································· 7

3.1 本课题设计(研究)的目的 ............................................................................... 7

3.2 设计(研究)现状和发展趋势(文献综述) ................................................... 7

3.2.1 预应力简支梁桥的现状 ································································ 7

3.2.2 预应力简支梁桥的发展趋势 ·························································· 7

3.2.3 预应力连续梁桥的现状 ································································ 7

3.2.4 连续梁桥的发展趋势 ··································································· 8

3.2.5 预应力连续刚构桥型的现状 ·························································· 8

3.2.6 预应力连续刚构桥梁的发展趋势 ··················································· 8

3.3 方案比选 ............................................................................................................... 8

3.4 推荐方案 ..............................................................................................................11

4 上部结构内力计算····················································································· 12

木蓬特大桥施工图设计

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4.1 截面几何特性 ..................................................................................................... 12

4.1.1 桥梁跨径及桥宽 ········································································ 12

4.1.2 材料规格 ················································································· 12

4.1.3 毛截面几何特性计算 ································································· 13

4.2 施工过程 ............................................................................................................. 13

4.3 恒载内力计算 ..................................................................................................... 15

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

4.4.1 车道横向分布调整系数 ······························································ 17

4.4.2 冲击系数 ················································································· 17

4.4.3 汽车荷载 ················································································· 18

4.5 墩台基础沉降内力及温度应力计算 ................................................................. 20

4.5.1 支座沉降次内力计算 ································································· 20

4.5.2 温度应力计算 ··········································································· 21

4.6 内力组合 ............................................................................................................. 24

4.6.1 承载能力极限状态下的效应组合 ················································· 24

4.6.2 正常使用极限状态效应组合 ························································ 27

5 预应力钢束的估算与布置 ··········································································· 32

5.1 估算原理 ............................................................................................................. 32

5.2 预应力筋估算结果 ............................................................................................. 32

5.3 预应力筋布置原则 ............................................................................................. 33

5.4 预应力钢束布置情况 ......................................................................................... 34

5.5 预应力损失计算 ................................................................................................. 36

5.5.1 预应力筋与孔道壁之间摩擦引起的应力损失 ································· 37

5.5.2 锚具变形、钢筋回缩引起的应力损失 ··········································· 37

5.5.3 钢筋与台座间的温度引起的损失 ················································· 38

5.5.4 混凝土弹性压缩引起的应力损失 ················································· 38

5.5.5 预应力钢筋松弛引起的损失 ························································ 38

5.5.6 混凝土收缩徐变引起的应力损失 ················································· 39

5.6 结论 ..................................................................................................................... 43

木蓬特大桥施工图设计

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6 强度验算 ································································································· 44

6.1 基本理论 ............................................................................................................. 44

6.2 计算公式 ............................................................................................................. 44

7 抗裂验算 ································································································· 53

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

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

8 按持久状况和短暂状况极限状态的要求进行验算 ··········································· 60

8.1 持久状况截面应力验算 ..................................................................................... 60

8.1.1 正截面混凝土压应力验算结果····················································· 61

8.1.2 受拉区钢筋拉应力验算结果 ························································ 64

8.1.3 斜截面混凝土压应力验算结果····················································· 64

8.2 短暂状况截面应力验算 ..................................................................................... 67

8.2.1 施工阶段法向压应力验算结果····················································· 68

9 挠度验算 ································································································· 74

9.1 挠度验算要求 ..................................................................................................... 74

9.2 挠度验算结果 ..................................................................................................... 75

9.2.1 中跨跨中挠度验算····································································· 75

9.2.2 边跨最大挠度验算····································································· 75

参 考 文 献 ··································································································· 76

致 谢············································································································· 78


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