考虑地震动局部场地效应的大跨度斜拉桥随机地震响应分析  

Stochastic Seismic Response of Long-Span,Cable-Stayed Bridges under Local Site Effect

作　　者：武芳文[1] 赵雷[2] 

机构地区：[1]长安大学公路学院,西安710064 [2]西南交通大学土木工程学院,成都610031

出　　处：《地震研究》2010年第1期93-98,共6页Journal of Seismological Research

基　　金：国家科技支撑计划项目(2006BAG04B00)资助

摘　　要：基于随机振动理论,以苏通长江公路大桥为例,研究了局部场地效应对大跨度斜拉桥地震反应的影响。结果表明:与一致激励相比,局部场地效应对结构的内力和位移影响显著;场地效应对主梁、索塔内力和位移的影响程度及规律也不尽相同,须区别对待分析。With the growth of the main span of the cable-stayed bridges, the spatial effect of earthquake motion for the spatial structures becomes a new research topic. Based on stochastic vibration theory and taking the example of SuTong Yangtze River Highway Bridge, the stochastic seismic response of super-long-span, cable-stayed bridge under local effect is developed. The results indicate that the internal force and displacement are influenced obvi- ously by local site effect than by the uniform excitation. For different responses of internal force and displace- ment of the girder and tower, the impact and the rules are different for seismic ground motion under local effect. Therefore, in view of different cases, the analyses would have different results.

关 键 词：桥梁工程 随机振动 斜拉桥 地震动 局部场地效应 

分 类 号：TU352.11[建筑科学—结构工程]