异型拱桥的几何非线性分析  

Analysis on Geometric Nonlinearity of Variant Arch Bridges

作　　者：霍学晋[1] 韩立中[1,2] 

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2013年第7期46-53,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51138007);国家科技支撑计划项目(2011BAJ09B02)

摘　　要：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。Due to the unique configuration of variant arch bridges, the nonlinear behavior regularities are relatively complicated and difficult to master. With help of self-compiled program, the nonlinear behavior regularities of 5 variant arch bridges which have their own characteristics are analyzed. By contrast, it is concluded that （ 1 ） as a whole, the beam-column effect is the most influential factor to arch-beam composite butterfly-shaped arch bridge, the large displacement effect has the greatest influence on tied arch bridge with flying swallow type, the cable sag effect is the main influencing factor to arch-pylon cable-stayed bridge, while for thrust crescent-shaped arch bridge the influence of all nonlinear factors is rather little and can be neglected; （2） the cable sag effect of inclined cables is more noticeable compared with that of vertical cables, and all nonlinear factors have large influence on the cable forces, therefore, the cable sag effect of inclined cables should be accounted and the tensions of inclined cables must be calculated by nonlinear method ; （3） for the deck slabs and crossbeams which only bear load but not subject to force as a part of the whole structure, the nonlinear influence on their inner forces is negligibly small, the results meet request of precision by linear method, but the large displacement effect should be considered when calculating displacements.

关 键 词：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 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]