SEISMIC RESPONSE EVALUATION OF BRIDGES WITH ROCKING SEISMIC ISOLATION BASED ON SHAKING TABLE TESTS

Abstract

 Rocking seismic isolation is an isolation structure that actively utilizes the isolation effect caused by uplift of the foundation. The aim of this study was to clarify the seismic response characteristics of bridges that apply rocking seismic isolation based on shaking table tests using a bridge model which simulates the entire bridge system. In addition, a reproducible analysis of the shaking table tests was performed utilizing an earthquake response analysis using a discrete frame structure model. Results showed that rocking seismic isolation functions were effectively even in a bridge with two piers, with a significant reduction in the maximum bending moment at the base of the pier due to the isolation effect, and that the analytical model was able to predict the maximum value of the bending moment, but that it underestimated the maximum value of the girder response displacement.