Earthquake Response Prediction of Seismically Isolated Buildings Based on Response Spectrum Method Considering Changes in Characteristics of Lead Rubber Bearings Due to Repeated Deformation (Part 2): Improvement of Prediction Accuracy by Equivalent Damping Factor Calculation Method Using Effective Ductility Factor

Abstract

Since the response spectrum method (RSM), indicated by the Ministry of Construction notification Vol. 2009 (MCN), is out of the countermeasure against the Nankai trough long-period and long-duration ground motions (LPGMs) announced in 2016, we proposed a method for evaluating the influence of characteristic changes due to repeated deformation using RSM for LPGMs and seismically isolated buildings using lead rubber bearings. However, we identified potential areas for improvement in the effective damping calculation of RSM. In this paper, we propose an effective damping calculation method of RSM using effective ductility factor to improve the accuracy of the proposal method.