高層免震共同住宅を対象とした積層ゴムアイソレータの引き抜きに及ぼす地震動水平・上下両成分同時入力による影響

概要

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Since the Hyogoken-nanbu earthquake, a large number of base isolated high-rise apartment houses have been built in Japan. In any seismic design of such base isolated buildings of a large aspect ratio, full attention should be paid with respect to the possible uplift of an isolator. In this paper, the authors, making use of strong ground motion data in Japan and abroad for input, and making analysis of earthquake response based on a simultaneous input of both horizontal and vertical accelerograms, propose to show records of strong ground motion that had the effects of uplift on isolators, and to point out ground motion characteristics of fluctuation of pressures on isolators. The analysis by the authors indicates that any strong ground motion with uplifting effects takes place when both horizontal and vertical components strike it simultaneously or with a time lag of several seconds. Uplifting effects on an isolator are also observed in no small number of cases where a base isolated building is struck by either horizontal or vertical component of strong ground motion.
1999-01-30