鉛直地震動による変動軸力が鋼柱の弾塑性水平地震応答に及ぼす影響

概要

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This study aims at clarifying the characteristics of the effects of vertical ground motions on seismic responses of steel frames. The inelastic response of multi-story frames is characterized mainly by the restoring force of the lower parts of the frames. The vertical-motion-induced varying axial force affects the response of frames with weak columns to a greater degree than those with weak beams. Therefore, the effects of vertical motions were investigated by conducting on-line tests and numerical analyses using steel beam-column models which represented the behavior of the lower part of frames. It was clarified that the effects of vertical ground motions on earthquake response are small when the ratio of natural period in a vertical direction to that in a horizontal direction is 0.2 or less.
2000-03-30