EARTHQUAKE RESPONSE EVALUATION OF SEISMICALLY ISOLATED BUILDINGS CONSIDERING THERMAL-MECHANICAL COUPLED BEHAVIOR OF LEAD RUBBER BEARINGS

Abstract

It is known that when lead rubber bearings (LRB) are subjected to cyclic and large deformation under long period earthquake input, the temperature of lead plug rises up, resulting in deterioration of yield stress of LRB. The change in the response of the seismic isolation layer caused by the deterioration of yield stress is an important issue. This paper describes the earthquake response analysis method considering on heat-mechanics interaction behavior of LRB. Based on the study of response results and examination, the characteristics of the earthquake input are discussed. After that, a simple response evaluation method is proposed.