蝶形拱桥主梁的非线性行为及影响因素分析  

Analysis on Nonlinearity Behavior of Main Beam of Butterfly-shaped Arch Bridge and Its Influencing Factors

作　　者：霍学晋[1] 许圣祥 韩立中[3] 

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430050 [2]四川巴陕高速公路有限责任公司,四川成都610041 [3]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2014年第5期57-65,共9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：蝶形拱桥造型独特其主梁部分的非线性行为规律相对其他拱桥较为难掌握,传统未充分考虑非线性影响的设计方法已不再适用。在自编程序的基础上,全面分析了各种非线性因素下蝶形拱桥主梁部分的非线性行为并研究了外倾角、矢跨比、含钢率等设计参数的影响及规律。结果表明:拱肋单元的梁柱效应对主梁弯矩的影响是不利的,而主梁单元的梁柱效应能够有效地抵消这种不利影响;主梁弯矩的非线性行为规律相对挠度更加复杂;未加载侧边梁的影响系数受偏载距离的影响较大;各梁跨中挠度和弯矩的影响系数均随主拱肋外倾角的增大而增大;主拱肋含钢率和索拱平面间夹角对主梁非线性行为的影响可以忽略。Due to the unique pattern of butterfly-shaped arch bridge, the nonlinear behavior rules of main girder are difficult to master compared with ordinary arch bridges, the traditional design method which does not fully consider the nonlinear influence is not applicable. On the basis of self-compiled program, the nonlinear behaviors of main girder are analyzed considering various nonlinear factors, and the influence of many design parameters such as angle of depression, rise-span ratio, steel ratio and their regularities are studied. The results show that （ 1 ） the beam-column effect of arch rib elements has unfavorable influence on main beam moment, but the beam-column effect of main beam element can effectively counteract this adverse influence; （2） the nonlinear behavior regularity of main beam moment is more complicated than that of deflection ; （3） the distance of eccentric load has a larger influence on the influence coefficients of boundary beams at unloading side; （4） the influence coefficients of mid-span deflection and moment increase as the angle of depression of main arch rib gets larger; （5） the influence of steel ratio of main arch rib and the angle between cable plane and arch plane on nonlinear behaviors of main beam can be neglected.

关 键 词：桥梁工程 非线性行为 增量迭代法 蝶形拱桥 外倾角 矢跨比 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]