微動測定に基づく地震前後におけるRC造中低層建物の振動特性比較

概要

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We analyzed dynamic characteristics of 79 low and mid-rise reinforced concrete (RC) buildings in Fukuoka City before and after the West off Fukuoka earthquake of 2005 obtained by microtremor measurement. Then we compared reduction ratios of stiffness with the input strong motion levels and the observed damage levels. The average of the stiffness reduction ratios of all data is 0.800. As the values of the input strong motion level and the damage level become larger, the building stiffness deteriorates more. It is possible that the buildings that their stiffness deteriorates much larger than the average might be damaged in some invisible parts. The obtained results can be utilized as a standard reference for developments of damage detection methodology base on microtremor monitoring.
2008-05-30