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6Šª
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1982”N
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1177-1184•Å
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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Koichiro ASANO, Sanshiro SUZUKI
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DYNAMICAL COLLAPSING ANALYSIS OF NONLINEAR SYSTEMS WITH STIFFNESS DEGRADATION
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A technique to estimate earthquake responses of the lumped mass system with poly-linear hysteretic characteristics is presented, and by making use of this technique a dynamical collapsing process of the structural systems is studied. From the forced dynamical collapsing tests of structural models, the parameters associated with poly-linear hysteretic characteristics, prescribing the dynamical collapsing processes of the models, are determined, and the dynamical collapsing analysis corresponding to the test structural models are carried out. The comparison of the analytical and test results of displacement-restoring force relationships and displacement time history responses of this model leads to the conclusion that the technique presented herein seems to have a fairly well capability of predicting the dynamical collapsing processes of these models. This paper also deals with the dynamical collapsing process of a multi-degree-of-freedom system with poly-linear hysteretic characteristics whose stiffness degrades against the cumulative plastic flow in the form of an error function. From the analytical results obtained here, it can be found that the lower story of the system collapses more rapidly than the upper story of the system doe s.
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