抄録(英): |
Two types of nonlinear response, rigid-body overturning and rigid pendulum, are studied against near-field earthquake records, 1994 Northridge's as well as 1995 Great Kansai's. Though pendulum's equation of motion is a basis of the overturning's, the nonlinear response is not so complicated. The maximum angle of the pendulum, approximately safety limit of hanged furniture, is pretty large but could be computed from linear response spectrum. The complex overturning limit is not always estimated from linear response. The several primary large pulses, which characterize near-field earthquake, is another reason and make it capable to approximate the record by several simple pulse series.
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