Abstract
Peak accelerations of the ground motion exceeded 400 gal in Hiroshima-city during the Geiyo Earthquake (M6.4), occurred at 15:28, 24th March 2001. Although recorded peak accelerations were comparable to the Hyogoken Nanbu Earthquake, the damage of the steel structures was negligible. To clarify the reasons, we investigated acceleration response spectra of the seismic motions recorded in Hiroshima Prefecture and selected the P-584 steel circular pier in Hanshin Expressway as a numerical model, which occurred dynamic buckling during the Hyogoken Nanbu Earthquake. We show the computational results of the nonlinear dynamic response of the pier and clarify the characteristics of the Geiyo Eartquake motion from a viewpoint of destractive power.
