基础隔震高层建筑影响因素的理论分析

Theoretic Analysis for Effects on A Base-isolated High-rise Building

对采用基础隔震的高层建筑进行了三维有限元分析计算,研究了不同结构体系、双向地震作用、P-Δ效应以及加速度反应等对基础隔震高层建筑的影响。通过以上的研究,得出了结论:同一结构体系在相同地震波作用下,隔震结构的层间剪力比非隔震结构的层间剪力减小一个数量等级;不同结构体系在相同地震波作用下,隔震结构的位移随层数的变化趋势不一致;同一结构在不同地震波作用下,建筑物的地震反应相差较大;在建筑物中某些构件需要考虑双向地震波作用效应;隔震建筑物可以不考虑P-Δ效应;高层隔震建筑物的加速度反应不同于非隔震建筑物的加速度反应。结果表明,基础隔震技术可以应用于高层建筑。

In this paper,three-dimensional finite element analysis is used for the research of a base-isolated high-rise building.After studying the effects of different structural systems,action of bidirectional earthquake wave,P-Δ effect and acceleration responses on it,some useful conclusions are given as follows： in the same structural systems,the story shears of the isolated structure are one order of magnitude less than those of the non-isolated structure under the action of the same seismic waves;the story displacements of the isolated high-rise frame-shear structure and those of the isolated high-rise shear wall structure are different under the action of the same seismic waves;under the action of different seismic waves,the earthquake responses of the same structural system are quite different;the effects of bidirectional earthquake waves on some components should be considered;P-Δ effect can be ignored in the base-isolated building;and the acceleration responses of the isolated high-rise building are different from those of the non-isolated counterpart.The results show that the technology of base-isolation can be applied to the high-rise building system.