塑性履歴域で異なる粘性減衰性が梁崩壊型靱性架構の激震応答挙動に及ぼす影響

概要

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With little reasonable justifications, two different assumptions have been commonly used for modeling the action of damping forces upon yielding and hysteretic dynamic systems. One is a viscous damping formulation in which dashpot factors are reduced according to the instantaneous tangent stiffness of restoring force elements. The other follows the same treatment during elastic oscillation, however rendering the dashpot factors invariable even for yielding and hysteretic response. While practical engineers resort frequently to the latter assumption, its implications appear to be not fully recognized in evaluating the well developed response of yielding deformation. The present paper is intended to arouse caution under such circumstances, since this can lead to obviously unrealistic overestimation of damping effects far beyond the ordinary understanding. Significant discrepancies are also shown to feature the stress distribution of weak-girder R/C frames during their kinematic sway.
一般社団法人日本建築学会の論文