平面不规则高层建筑双层隔震体系的抗扭分析

Torsional Analysis of Double-layer Isolation System for Irregular High-rise Building

以某高层不规则框架结构为例,输入双向地震波,采用SAP2000分析罕遇地震作用下中间隔震层位于不同位置时双层隔震体系的减震性能,研究不同偏心率下不规则隔震结构的扭转响应.研究表明:中间隔震层位于3层时双层隔震体系的水平向减震系数、层间位移角和位移比均最小;双层隔震体系隔震层偏心率的大小对周期比和层间位移角的影响不大,隔震层偏心率较小时,位移比也较小,隔震体系具有良好的抗扭性能.因此,对于平面不规则高层建筑双层隔震体系,隔震层小偏心率且中间隔震层布置在结构中部偏下位置时,可有效限制结构的扭转响应.

Taking an irregular high-rise frame structure,with two-way seismic waves input as an example,the shock absorption performance of double-layer isolation system is studied by using SAP2000 under rare earthquake when the middle isolation layer is located at different locations,and torsional responses of irregularly isolated structures with different eccentricity ratio are discussed. The research shows that the horizontal damping coefficient,interlayer displacement angle and displacement ratio of double-layer isolation system are all the smallest when the middle isolation layer is located at the third layer. The magnitude of eccentricity ratio for the double-layer isolation system has little effect on the period ratio and the interlayer displacement angle. When the eccentricity ratio of isolation layer is small,the displacement ratio is also small,and the isolation system has better torsional performance.Therefore,the torsional response of structure can be effectively restrained for irregular high-rise building with double-layer isolation system when the isolation layer has a small eccentricity ratio and the middle isolation layer is arranged in the middle position of the structure.