常時微動計測に基づく中低層RC造建物の振動特性とその耐震性評価

概要

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In this paper, first we measure microtremors of standard buildings in Kyushu University, most of which are low- and middle-rise RC buildings to obtain resonant periods. Buildings of national universities had been constructed under strong code and budget control so they are expected to be similar to each other. Next, stiffnesses of the buildings are inverted from resonant periods together with design documents. Then we construct nonlinear seismic response models based on the numerical models already proposed for RC buildings in Kobe (Nagato and Kawase, 2000). Finally we conduct damage evaluation for these buildings by using simulated strong ground motions for a hypothesized Fukuoka earthquake. We confirmed that the resonant periods of buildings linearly correlate with their heights but that the long-span direction tends to have shorter resonant period than the short-span direction. The effects of soil-structure teraction are negligible in the short-span direction and noticeable in the long-span direction. We confirmed that the average seismic performance of measured buildings coincides with the average performance of buildings in Kobe and that no RC buildings will be collapsed or heavily damaged even for the worst scenario of expected earthquakes at the site.
社団法人日本建築学会の論文
2004-03-30