摘要
计算了SV波在3种角度入射下两座山峰及其间自由场地的时程响应,并以此作为两座山峰之间大跨桥的桥台及桥墩基础处的多点地震输入.这种地震输入考虑了行波传播效应和地形效应的综合影响.然后基于多点激励下桥梁地震响应分析方法,计算了地形条件下总长440m的高墩连续刚构桥的墩顶位移及墩底内力,并与忽略地形条件仅考虑行波效应时结构的响应进行了对比分析.该结果可为建于复杂地形条件下结构的抗震设计提供参考.
The seismic ground motions of a surface site between two mountams on a half-space excited by SV wave with three different incidence angles are calculated. The result is then used as the input to a multi-support long-span bridge in the second analysis stage, in which the synthetic effects of both wave propagation and topography are considered. Based on these results, a finite element program for seismic response of a long-span bridge with multi-support excitations has been developed. The displacement and internal force of a 440 m longspan rigid-framed bridge are analyzed with the topographic effect being considered, and the response is compared against those when only the traveling-wave effect is taken into account. The conclusion can serve as a reference for seismic design of the structures located on the complex topographic condition.
出处
《地震学报》
CSCD
北大核心
2008年第3期307-314,共8页
Acta Seismologica Sinica
基金
国家自然科学基金项目(50678001)
北京市教育委员会科技发展计划重点项目(kz200710009005)资助
关键词
行波效应
地形影响
多点激励
刚构桥
地震响应
traveling-wave effect
topographic effect
multi-support excitation
rigid-framed bridge
seismic response
