龚溪口大桥桥梁支架的研究与应用

发表于2018-08-17 1310人浏览 1人跟帖总热度:260

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标签：桥梁支架支架研究有限元分析稳定性分析桥梁设计

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龚溪口大桥桥梁支架的研究与应用

拱桥是我国最常用的一种桥梁型式，其式样之多，数量之大，为各种桥型之冠，特别是公路桥梁，据不完全统计，我国的公路桥中百分之七十为拱桥。拱桥与梁桥的区别，不仅在于外形有同，更重要的是两者受力性能有差别。梁桥在竖向荷载作用下，支承处仅仅产生竖向支承反力，而拱桥在竖向荷载作用下，支承处除有竖向反力外，还产生水平推力。正是这个水平推力，使拱内产生轴向压力，从而大大减小了拱圈的截面弯矩，使它的主拱截面材料强度得到充分发挥，跨越能力增大。

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中文摘要………………………………………………………………………………I

英文摘要……………………………………………………………………………II

第 1 章概述···································································································1

1.1 拱桥的基本特点····················································································1

1.2 拱桥的现状及发展··················································································1

1.3 混凝土拱桥施工方法简介·········································································2

1.4 选题的背景···························································································3

1.5 课题研究的内容·····················································································4

1.6 贵州省沿河龚溪口大桥工程简介································································4

第 2 章支架的有限元分析理论············································································ 8

2.1 结构有限元的一般性分析概述···································································8

2.2 钢拱架受力强度、刚度分析······································································9

2.3 钢拱架整体稳定性分析·········································································· 10

2.4 空间梁单元························································································· 11

2.5 板壳单元···························································································· 14

第 3 章支架的有限元模型建立···········································································18

3.1 计算方法···························································································· 18

3.2 计算前提···························································································· 21

3.3 支架荷载计算······················································································ 22

3.4 支架构件基本参数················································································ 23

3.5 施工阶段分析······················································································ 24

第 4 章支架的强度、刚度和稳定性分析·······························································27

4.1 拱架单独作用······················································································27

4.1.1 浇拱圈底板第一段（拱脚浇筑 20 米）··············································27

4.1.2 浇拱圈底板第二段（拱顶浇筑 20 米）··············································29

4.1.3 浇拱圈底板第三段······································································· 31

4.1.4 浇拱圈腹板第一段(拱脚浇筑 20 米)·················································33

4.1.5 浇拱圈腹板第二段(拱顶浇筑 20 米)·················································35

4.1.6 浇拱圈腹板第三段······································································· 37

4.1.7 浇拱圈顶板第一段(拱脚浇筑 20 米)·················································39

4.1.8 浇拱圈顶板第二段(拱顶浇筑 20 米)·················································41

4.1.9 浇拱圈顶板第三段······································································· 43

4.1.10 整体稳定性分析·········································································45

4.1.11 拱架单独作用计算结论································································47

4.2 拱架与拱圈混凝土联合作用···································································· 48

4.2.1 浇拱圈底板第一段（拱脚浇筑 20 米）··············································48

4.2.2 浇拱圈底板第二段（拱顶浇筑 20 米）··············································49

4.2.3 浇拱圈底板第三段······································································· 50

4.2.4 浇拱圈腹板第一段(拱脚浇筑 20 米)·················································51

4.2.5 浇拱圈腹板第二段(拱顶浇筑 20 米)·················································52

4.2.6 浇拱圈腹板第三段······································································· 53

4.2.7 浇拱圈顶板第一段(拱脚浇筑 20 米)·················································54

4.2.8 浇拱圈顶板第二段(拱顶浇筑 20 米)·················································55

4.2.9 浇拱圈顶板第三段······································································· 56

4.2.10 整体稳定性分析·········································································57

4.2.11 拱架与拱圈混凝土联合作用计算结论··············································60

第 5 章拱架单独作用与拱架-砼联合作用的比较·····················································61

5.1 比较分析·····························································································61

5.1.1 浇筑拱圈底板比较······································································· 61

5.1.2 浇筑拱圈腹板第一段(拱脚浇筑 20 米)比较······································· 61

5.1.3 浇筑拱圈腹板第二段(拱顶浇筑 20 米)比较······································· 63

5.1.4 浇筑拱圈腹板第三段比较······························································ 65

5.1.5 浇筑拱圈顶板第一段(拱脚浇筑 20 米)比较······································· 67

5.1.6 浇筑拱圈顶板第二段(拱顶浇筑 20 米)比较······································· 69

5.1.7 浇筑拱圈顶板第三段比较······························································ 71

5.2 结论···································································································73

致谢··············································································································64

参考文献········································································································65

附录··············································································································67

声明··············································································································68

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龚溪口大桥桥梁支架的研究与应用

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