Earthquake response prediction of seismically isolated buildings based on the response spectrum method considering changes in characteristics of lead rubber bearings due to repeated deformations

In 2016, a countermeasure was announced against the Nankai Trough long-period and long-duration ground motions (LPGMs) in Japan. However, the response spectrum method (RSM), indicated by the Ministry of Construction notification Vol. 2009 (MCN), was out of the countermeasure. An RSM considering characteristic changes due to repeated deformations has also been proposed. However, since the damping correction formula of MCN was used, its applicability to LPMGs has not been sufficiently investigated. In this paper, a method is proposed to evaluate the influence of characteristic changes due to repeated deformations using RSM for LPGMs and seismically isolated buildings using the lead plug-inserted laminated rubber (LRB).