高层建筑双层隔震体系的地震响应分析

Seismic Response Analysis of Double Isolation System in High-Rise Building

以某高层框架结构为例,输入三条地震波,采用SAP2000分析双层隔震体系在多遇地震和罕遇地震作用下的地震响应,研究中间隔震层位于不同位置时双层隔震体系的减震性能,并建议中间隔震层的最优位置。研究表明:高层框架采用双层隔震体系的隔震效果比基础隔震体系要好,罕遇地震下效果更加明显。中间隔震层位于九层时双层隔震与基础隔震体系的隔震效果差不多,多遇地震下中间隔震层位于三层时双层隔震体系的各楼层层间位移角均最小,但在罕遇地震作用下,三层隔震时中间层处的层间位移角发生突变,比六层隔震还要大,因此,建议中间隔震层布置在结构中部偏下位置可取得较好的隔震效果。

Taking a high-rise frame structure as an example,three seismic waves are input,and the seismic responses of the double isolation system under frequent earthquake and rare earthquakes are analyzed by SAP2000.The damping performances of double isolation system at different locations are studied,and the optimal position of the middle isolation layer is proposed.The results show that the isolation effect of double isolation system is better than that of the base isolation system,and the effect under rare earthquakes is more obvious.When the middle isolation layer is located on the ninth layer,the isolation effect of double isolation and base isolation system is similar.The interlayer displacement angle of each floor of double isolation system is the smallest under frequent earthquake when the middle isolation layer is located on the third layer.However,the interlayer displacement angle of the middle layer for three-story isolation changes suddenly,which is larger than that of six-story isolation under rare earthquakes.Therefore,it is suggested that the middle isolation layer should be arranged at the lower part of the middle of structure to obtain better isolation effect.