Performance evaluation of base--isolated Yama-age bridge with high damping rubber bearings using recorded seismic data

摘要

Identification of system parameters with the help of records made on a base--isolated bridge during earthquakes, provides an excellent opportunity to study the performance of various components of such a bridge system under these loading conditions. This study utilizes a two--stage system identification methodology for identifying the modal and structural parameters of base-isolated Yama-age bridge in Japan from multiple set of recorded seismic acceleration data. By comparing the identified and physical para- meters, performance of the base-isolation system is evaluated and the effect of soil--structure interaction on the overall performance of the bridge is examined.