大跨度拱桥随机地震响应分析  

Random Seismic Response Analysis of Long-span Arch Bridge

作　　者：禹奇才[1] 刘爱荣[1] 唐潘[1] 程方杰[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《中山大学学报（自然科学版）》2011年第4期32-36,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(50978062);广东省自然科学基金资助项目(9151065004000002);广东省科技计划资助项目(2010A030200014);广州市科技计划资助项目(2010Y1-C751);广州市属高校科研资助项目(10A005)

摘　　要：基于随机振动理论,研究了大跨度拱桥在不同的地震动空间条件下的平稳随机地震响应特征,分析了局部场地效应、部分相干效应和行波效应对大跨度拱桥地震响应的影响,揭示了地震动空间变化对大跨度拱桥随机地震响应的影响规律。阐明了局部场地效应对大跨度拱桥地震响应的影响与其构造特性、位置、边界条件等因素有关;考虑空间相干效应可减小大跨度拱桥的地震反应;地震内力响应随地震视波速的增大而减少。Based on the theory of random vibration,the stationary random seismic response characteristics on long-span arch bridge under different condition of the spatical variable ground motions was investigated,and the influence of seismic response on long-span arch bridge under the local site effect,part of coherent effect and traveling wave effect was analysed,then the influence of the spatical variable ground motions on the long-span arch bridge random seismic response was demonstrated.It is showed that the influence of seismic response on long-span arch bridge is relative with its structure characteristics,position,boundary conditions;Considering the part of coherent effect,the seismic response increases insignificantly,while the seismic response of long-span arch bridge show an increasing trend with the seismic shear wave velocities increasing.

关 键 词：大跨度拱桥 随机地震响应 局部场地效应 部分相干效应 行波效应 

分 类 号：U445.7[建筑科学—桥梁与隧道工程] TU375[交通运输工程—道路与铁道工程]