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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共82页
拱架预压
基本三角结构图
下弦杆结构图
附件-96957769669977889.pdf