多维地震激励下某建筑结构隔震控制参数分析

Analysis of vibration isolation controlling parameters of a structure under multi-dimensional seismic excitations

研究了多维地震激励下具有不同隔震控制参数的结构的响应。运用SAP2000有限元软件,根据某个实际工程建立了有限元模型,并对结构进行了动力特性的分析。选取Ⅱ类场地上3条多维地震动,给出了隔震支座的有限元模拟过程。介绍了隔震支座基本参数的选取方法,根据选取的隔震支座,比较了结构有、无隔震支座时的周期。分别研究了多维地震动激励下结构有、无隔震支座的反应。研究结果表明:单维和多维地震激励下,结构的隔震响应不同,应该按照多维地震情况考虑;多维地震动的入射角对结构隔震响应的影响显著,不容忽视;多维地震动强度峰值比对结构隔震响应的影响很小,可以忽略不计。

The response of structure with different isolation control parameters under multi-dimensional seismic ex-citations was studied. The finite element model of structure was established by SAP2000 finite element software forsome practical project, and the dynamic characteristics of structure were analyzed. Three multi-dimensional seismicwaves of medium hard site were selected, and the finite element simulation of isolation bearing was given. The basic parameters of isolation bearing were introduced, and the periods of structure with and without isolation bearingwere compared. The responses of structure with and without isolation bearing under three multi-dimensional seismicexcitations were analyzed, respectively. The results show that the response of the isolated structure under single di-mensional seismic excitation is different from that under multi-dimensional seismic excitation. It is necessary to con-sider multi-component ground motion. The incident angle of multi-component ground motion has a great influenceon the response of the isolated structure and the effect of incident angle can not be ignored. The peak ratios betweenmulti-dimensional ground motion intensites have only a small effect on the response of the isolated structure, there-fore they can be neglected.