近断层地震作用下层间隔震结构弹簧软限位分析

Analysis of Spring Limiting Deformation of Story Isolation Layer under Near-fault Ground Motion

近断层地震作用下,层间隔震结构隔震层会产生较大位移,易造成上部结构的侧向倾覆失稳或支座损坏。采用软碰撞限位器对隔震结构进行保护,利用有限元软件SAP2000对一栋8层钢筋混凝土框架结构输入罕遇烈度近断层地震波,分析隔震层设置在1层、4层、7层时隔震结构的限位动力响应,研究了软限位装置的预留距离、限位刚度对隔震层和结构动力响应的影响。

The near-fault ground motion may bring about the isolated structure excessive deformation at the isolation layer so that it will easily lead to a lateral overturning instability or support damage of the structures. The soft limiting deformation is used for the protection of the structures at the isolation layer,and the SAP2000 is used to analyze the limiting displacement dynamic responses of the isolated structure while isolation layer is disposed on the first floor,the fourth floor,the seventh floor of an 8 story reinforced concrete frame structure by inputting near-fault rare seismic waves. The influences to the isolation layer and the structure dynamic responses caused by the different reserved spaces and limiting stiffness of the limiting devices are analyzed at the same time.