大跨高墩城市轨道交通斜拉桥动力特性及抗风性能  

Dynamic Characteristic and Wind Resistance Behavior of High-pier Long-span Cable-stayed Bridge for Urban Rail Transit

作　　者：李永乐[1] 邸月龙[1] 赵彤[1] 姜孝伟[1] 

机构地区：[1]西南交通大学桥梁工程系,四川成都610031

出　　处：《建筑科学与工程学报》2010年第4期19-24,共6页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(90915006);教育部新世纪优秀人才支持计划项目(NCET-06-0802);四川省杰出青年学科带头人计划项目(2009-15-406)

摘　　要：以大跨高墩城市轨道交通斜拉桥的3种桥型方案为工程背景,分别建立空间有限元模型,并进行结构的动力特性计算,对其自振频率和振型特点进行对比分析;基于自主研究开发的桥梁结构分析软件BANSYS,利用二维平面流场理论和多模态耦合振动分析的方法,对大跨高墩城市轨道交通斜拉桥结构在静风荷载下的稳定性和由脉动风引起的抖振位移及抖振内力进行了对比分析。结果表明:大跨高墩城市轨道交通斜拉桥结构整体较柔,各方案之间因结构差异导致的动力特性和风致响应的差别不容忽视。Taking the three schemes of high-pier long-span cable-stayed bridge for urban rail transit as the engineering background,the spatial finite element models were built respectively.The dynamic characteristics of the structures were calculated,and the natural frequencies and vibration mode characteristics were comparatively analyzed.Based on a self-developed bridge structure analysis software BANSYS,the stabilities of the structures under the static wind load were studied with the theory of two-dimensional flow field,meanwhile,the buffeting displacement and buffeting internal force induced by fluctuating wind of high-pier long-span cable-stayed bridge for urban rail transit were comparatively analyzed by using the multi-mode coupled vibration analysis method.Results show that the whole structure of the high-pier long-span cable-stayed bridge for urban rail transit is flexible;moreover,the differences of dynamic characteristics and wind-induced responses among the three schemes should not be neglected due to the discrepancy in structures.

关 键 词：大跨度斜拉桥 动力特性 多模态耦合振动 风致响应 抗风性能 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]