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异型拱桥的几何非线性分析

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Keywords: 桥梁工程,异型拱桥,几何非线性,增量迭代法,大位移,梁柱效应,索的垂度

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Abstract:

异型拱桥由于造型独特其非线性行为规律较为复杂且难以掌握。利用自编程序分析了5座各具特点的异型拱桥的非线性行为规律,通过对比总结出以下结论整体上,拱梁组合式蝶形拱桥中梁柱效应的影响最大,飞燕式系杆拱桥中大位移效应的影响最大,拱塔斜拉桥中索的垂度效应最为明显,而对于有推力的新月形拱桥,各非线性因素的影响均较小,可忽略不计;相对竖直索,斜索的垂度效应较为明显,且其索力受各非线性因素的影响均较大,计算时宜计入斜索的垂度效应并应对斜索索力进行非线性分析;对于仅承受荷载而不参与整体受力的桥面板和横梁,内力受非线性因素的影响很小,采用线性方法具有足够的精度,但计算位移时需计入大位移效应的影响。

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