不同频域地震动下混合被动控制体系的减隔震效果

Seismic reduction-isolation effect of hybrid passive control system in case of different frequency-domain ground motion with

以高层框架结构为对象,提出一种结合分段隔震和相邻建筑物连接阻尼器耗能的新型混合被动控制体系,能有效应对宽频地面运动,具有较高的鲁棒性和冗余度.通过对同一高层建筑结构分别采用无隔震形式、分段隔震形式和混合被动控制形式进行数值模拟,考察短周期波、含滑冲效应脉冲波和长周期波作用下分段隔震体系和混合被动控制体系的减隔震效果.研究表明,短周期波作用下分段隔震体系控制效果较好,但在含滑冲效应脉冲波和长周期波作用下分段隔震效果不佳,基础隔震层和中间隔震层的位移较大,存在超出支座位移限值的可能,而采用混合被动控制体系能有效减小隔震层的位移,显著提高结构减隔震效果,且当中间隔震层设置在结构中部时混合被动控制体系的减隔震效果较好.

Taking the high-storey framework structure as object,a new type hybrid passive control system is proposed based on segmental seismic isolation combined with energy dissipation of inter-connected adjacent buildings as dampers,which can effectively cope with wide-range ground motion and has higher robustness and redundancy.Through numerical simulations of an identical high-rise building structure respectively with non-isolated form,segmental seismic isolation form and hybrid passive control form,the effect of seismic reduction and isolation of the segmental seismic isolation system and hybrid passive control system is investigated under the action of short-period wave,sliding effect included impulse wave and long-period wave.It is shown by the investigation that the control effect of segmental seismic isolation system will be better under the action of short-period wave,but its control effect will not so good under the action of impulse wave and long-period wave due to the greater displacement of the base seismic isolation storey and intermediate seismic isolation storey and there will be a possibility that this displacement is larger than the limit value of the support displacement.Nevertheless,the hybrid passive control system will be able to reduce effectively the displacement of the seismic isolation storey and improve obviously the seismic reduction and isolation effect of the structure.And the hybrid passive control system will have better seismic reduction and isolation effect when the intermediate isolation storey is set in the middle of the structure.