竖向近断层地震动下QZSID隔震系统的地震响应  

Seismic performance of QZSID isolation system under near-fault vertical earthquakes

作　　者：卢晓峰[1] 刘阳[2] LU Xiaofeng;LIU Yang(Yangzhou Polytechnic Institute,225127 Yangzhou,China;College of Civil Engineering,Tongji University,200092 Shanghai,China)

机构地区：[1]扬州工业职业技术学院,扬州225127 [2]同济大学土木工程学院,上海200092

出　　处：《应用力学学报》2022年第6期1185-1192,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.51508414)。

摘　　要：采用准零刚度、阻尼器和惯容器并联组合形成一种新的混合隔震系统QZSID。为研究竖向近断层地震动下QZSID隔震系统的动力反应机理,建立了竖向地震下QZSID系统的分析模型。采用非线性时程反应分析方法分析了QZSID隔震系统的响应控制效果。研究结果表明惯容器的地震响应控制效果与近断层地震动的卓越周期相关;惯容器对长周期近断层地震动的加速度控制效果较好,但对位移控制效果较差;对于长周期地震波作用下虽然共振周期没有延长,但系统能避开结构地震波的共振频率,因此系统仍能获得良好的减震效果;系统的竖向自振周期不宜取值过大;阻尼比及竖向静态平衡点高度参数能有助于系统的位移响应控制,惯容器质量大小与地震响应数值不成比例关系,应考虑近断层地震动波频谱特性。The QZSID system consisting of parallel Quasi-Zero-Stiffness(QZS),damper and inerter is studied.In order to study the dynamic response mechanism of QZSID isolation system under near-fault vertical earthquake,an analysis model of QZSID system under vertical earthquake is established.The response control effect of QZSID isolation system is analyzed by nonlinear time-history response.The results show that the seismic response control effect of inerter is related to predominant period of near-fault vertical earthquakes.The inerter has a good control effect on the acceleration of long-period near-fault earthquakes.However,there is a poor control effect on the displacement.Although the resonance period is not prolonged under the action of long-period ground motion,the system can avoid the resonance frequency of ground motion.The system can still obtain good isolation effect.The vertical natural vibration period of the system should not be too large.The damping ratio and static equilibrium height can be helpful to the seismic response control of the system.Seismic responses are not proportioned to the mass parameters of inerter.The isolation effect of the inerter is related to the characteristics of ground motions.

关 键 词：竖向近断层地震动 QZSID隔震系统 地震响应控制 

分 类 号：TU311.3[建筑科学—结构工程]