高位层间隔震结构电梯井核心筒剪力墙处理方法研究

Processing method for a core shear wall with high-level story isolation technology

为了解决高位层间隔震结构中电梯井核心筒剪力墙在隔震层位置需断开的问题,提出一种高位层间隔震结构电梯井核心筒剪力墙处理方法(PMIT),介绍了其原理、构造、特点。采用ETABS软件对电梯井核心筒结构与外围结构之间布置粘滞阻尼器、弹簧、无阻尼器和弹簧的PMIT结构、悬挂法结构和框支剪力墙结构进行了分析,分析结果表明:①PMIT结构隔震层下部结构层间位移角和隔震位置电梯井剪力墙弯矩相比于框支剪力墙结构都有减小,而悬挂法隔震层下部层间位移相比于框支剪力墙结构放大了约150%,PMIT对隔震层下部结构刚度不会产生影响,避免隔震层下部结构出现薄弱层;②相比于悬挂法结构,布置粘滞阻尼器PMIT结构隔震层最外侧隔震支座拉力减小了约50%(仅水平地震作用),提高结构的抗倾覆性能。

A processing method for a core shear wall with high-level story isolation technology（PMIT）was proposed,its principle,configuration,and characteristics were illustrated.The problem that the core shear wall needed to be broken in the isolation story could be overcome using the new method.With the use of ETABS software,the PMIT models of placing viscous dampers and elastic springs,or no damper and elastic spring in the pre-fixed gap between the core shear wall and the around upper structure,the model of the suspense method and the frame-support shear wall structure model were built,nonlinear time history analyses under frequent earthquakes were conducted.The results showed that ① comparing with frame-support shear wall structures,the story drift of the substructure of the isolation story is reduced with PMIT,however,it increases about 150% using the suspense method;the structural seismic performance with PMIT is not influenced;②comparing with structures using the suspense method,the tension force of the lateral isolator in the isolation story decreases about 50% only during horizontal earthquake action with viscous dampers placed in the pre-fixed gap,the overturning resistance performance can be obviously improved.