中间隔震层位置变化对混合被动控制体系控制效果影响的试验研究

Experimental study on the influence of the position variation of intermediate isolation layer on the control effect of hybrid passive control system

提出了一种分段隔震结构与相邻结构连接耗能的新型混合被动控制体系。与单一的减隔震体系相比,这种新体系将隔震与阻尼器耗能结合在一起,对不同频域地震动具有较强的鲁棒性。通过振动台试验输入不同频域的地震动,研究了分段隔震结构中间隔震层位置变化对隔震效果的影响。最后将有限元数值模拟与试验结果进行了对比。研究表明:长周期地震波对隔震结构的位移、加速度的影响相较于其他频域地震动更为显著,会使隔震支座超限的可能性增大;中间隔震层位于结构竖向靠中部位置时结构整体动力响应最小;混合被动控制体系可以有效解决高层减隔震结构目前所存在的位移超限、结构整体倾覆等问题,对不同频域地震波激励下的结构响应均有更为优越的控制效果。

A type of hybrid passive control system with energy dissipation between isolated structures and adjacent structures is proposed.Compared with a single seismic isolation system,the proposed system has much stronger robustness to different frequency domain ground motions via combining isolation and damper energy consumption together.The influence of the location of the middle isolation layer on the isolation effect of the segmented isolated structure is studied by inputting different frequency domain ground motions through shaking table test.The finite element numerical simulation is compared with the experimental results.The results show that compared with other frequency-domain ground motions,the influence of long-period seismic wave on the response of the displacement and acceleration of isolated structure is more significant,which will increase the possibility of bearing overrun The overall dynamic response of the structure is the minimum when the middle isolation layer is located in the vertical middle position of the structure.The hybrid passive control system can effectively solve the problems of displacement overrun and overall overturning of high-rise seismic isolation structures,and has better control effect on the structural response under different frequency-domain seismic excitations.