MODELING OF A RUBBER BEARING AND ITS PARAMETERS ESTIMATION BASED ON ITS DYNAMIC RESPONSE

Due to complex nature of excitations and the inherent dynamic characteristics of restoring force of a base isolation system,the response of a rubber bearing subject to strong earthquake is very complicated.Hence it is necessary to describe the restoring force and evaluate the behavior of the rubber bearing while it is working.Here,the revised Wen's model is put forward for analyzing the properties of a rubber bearing.Since the high-nonlinearly hysteretic model can't be identified by the extended Kalman filter approach,the parameter values are estimated by the first-order polynomial approximation method on the basis of the actual acceleration records.The method proposed has some virtues,such as,less computation,high precision,and easy to realize.The studying results can not only be taken as a useful reference for the seismic design of rubber bearings,but also provide the theoretical base for structural health monitoring(SHM) of rubber bearings.