EFFECTS OF GROUND MOTION IN THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE ON NONLINEAR RESPONSE OF STRUCTURES

Abstract

 Tsukidate observing station of K-NET recorded acceleration of more than 27m/s² during The 2011 off the Pacific coast of Tohoku Earthquake. It is noted that the ground motions with long duration were observed in this earthquake. This study examines some of the characteristics of The 2011 off the Pacific coast of Tohoku Earthquake using nonlinear response analysis and nonlinear spectral analysis on the single-degree-of-freedom system. Based on the results of the studies, it is found that the ground motions in this earthquake have caused large response in the natural period of less than 0.5 seconds and smaller response than the current design codes in natural period range that affect the general bridges.