DAMAGE EVALUATION OF SEISMIC ISOLATED DAMPER BY RESPONSE ANALYSIS USING OBSERVED SEISMIC RECORDS OF THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

Abstract

The 2011 off the Pacific coast of Tohoku earthquake generated the main shock with long-duration and long-period and the magnitude 7.0 class aftershocks many times in a wide range of eastern Japan. The horizontal displacement response of the isolated building caused by them was about 0.4 m. They damaged seismic isolated dampers such as steel dampers and lead dampers. This paper presents to evaluate responses of isolated buildings and the damage of seismic isolated dampers by results of response analysis using simple isolated building model under bi-axial horizontal loading in main shock and aftershocks observed at 6 points from Aomori to Tokyo.