部分骨組の履歴ループ形状が建物の安定性と最大応答変形に及ぼす影響

概要

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The influence of hysteretic loops with negative post-yield tangent stiffness and multi-yield characteristics on seismic response of single-degree-of-freedom (SDOF) and multi-degree-of-freedom (MDOF) structures is investigated in this study. The SDOF models, MDOF shear-beam models, and MDOF coupled shear-flexural-beam models with various structural parameters are analyzed for a number of ground motions to identify the trend of structural response. Major findings are 1) SDOF and MDOF shear-beam model have a large probability of crawling collapse once the structure exhibits a negative post-yield tangent stiffness, 2) the change of hysteretic loop with negative slope to multi-yield loop is effective to reduce the maximum story drift particularly for MDOF shear-beam model, and 3) the addition of flexural-beam to the shear-beam is very effective to reduce the maximum story drift and drift concentrations, which diminishes the multi-yield hysteretic loop effects.
2006-04-30