大底盘多塔高层隔震结构的地震响应

Seismic response of multi-tower isolated structure with an enlarged base

采用弹性时程分析方法,结合某大底盘多塔隔震结构(建成后将成为目前大陆地区最高的隔震建筑),分析结构在多遇及罕遇地震作用下的响应。对比层间剪力,计算水平向折减系数,绘制结构层间位移的变化曲线,并探讨高层复杂结构应用隔震技术的相关要求。结果表明,隔震结构的地震作用显著降低,层间剪力远小于抗震结构的,罕遇地震作用下的水平向折减系数更小;层间位移主要集中在隔震层,上部结构的层间位移几乎为零,结构呈现出明显的整体平动趋势。

The earthquake response analysis of one multi-tower isolated structure with an enlarged base is carried out using elastic time history analysis method(It will be the tallest isolated building in the mainland after be built).Story shear force was compared and horizontal reduction coefficient was calculated.Variation of story displacement was plotted into curves and application of seismic isolation in high-rise buildings was also discussed.The results show that seismic response decreases obviously and story shear force is far less than that of aseismic structures.Horizontal reduction coefficient is lower under rare earthquake.Story displacement is centralized at isolation layer,while it approaches zero on superstructure.The isolated structure shows whole translational motion.