SYSTEM IDENTIFICATION OF THE BASE ISOLATED STRUCTURE BY PREDICTION ERROR METHOD USING RECORDED SEISMIC RESPONSE DATA UNDER HYOGOKEN-NANBU EARTHQUAKE

摘要

A procedure for nonlinear system identification using prediction error identification method with state-space description (PEM-SS) is presented. System identifications of the base isolated structure by this method using recorded seismic response data under Hyogoken-Nanbu earthquake are carried out. As the result, PEM-SS using nonlinear MDOF model is found to be very effective to identify the dynamic characteristics of the base isolated structure. The results using several nonlinear SDOF and MDOF models indicate that MDOF model considering both bilinear force displacement relation and viscous damping of the base isolated story is most appropriate for this structure.