近场下桥梁结构的地震响应分析  

Seismic Response of Bridge Structure in Near-field

作　　者：王昊[1] 谭平[1] 殷伟希[1] 周福霖[1] 

机构地区：[1]广州大学减震控制与结构安全国家重点实验室培育基地,广东广州510405

出　　处：《华南地震》2010年第2期8-14,共7页South China Journal of Seismology

基　　金：国家自然科学基金重点项目(90815027);国家自然科学基金项目(50608021)

摘　　要：提出采用宽频地震Kanai-Tajimi模型与速度脉冲He-Agrawal模型来模拟近场地震动,数值模拟验证了该近场地震模型的有效性。采用该模型定量分析了近场地震作用对桥梁结构地震响应的影响规律。近场地震动的脉冲持时是对结构产生破坏的一个重要因素,近场地震作用对桥梁结构的设计提出了更高的延性要求。This paper presented a new analytical model for near-field ground motions,in which Kanai-Tajimi broad-band model and He-Agrawal velocity pulse model were combined.The effectiveness of the proposed analytical model for near-field ground motions was verified by numerical simulation of several typical near-filed records.This paper quantitatively analyzed the response pattern of bridge structure under near-field earthquakes.Results showed that the pulse duration was a key factor to the failure of bridge structure.A higher ductility level is needed for the design of bridge structure under near-field earthquakes.

关 键 词：近场地震 脉冲分量 桥梁结构 

分 类 号：P315.92[天文地球—地震学]