QUANTIFICATION OF RISK REDUCTION EFFECTS FOR MULTIPLE BUILDINGS BY PERIODIC CORRELATION IN GROUND MOTION

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  • 地震動の周期間相関による複数建物のリスク低減効果の定量化

Abstract

<p>Effect of inter-period correlation of spectral accelerations on seismic risk reduction was examined. At first, authors introduce the measure, that is the ratio of probable maximum loss (PML) of portfolio of buildings to the some of PMLs of individual buildings, in order to quantify the reduction in seismic risk. The multi-event model that is often employed for the seismic risk analysis of the portfolio of buildings located in the different places was utilized to handle the inter-period correlation. Three buildings whose natural periods are 0.3 s, 1.0 s and 3.0 s, respectively, were selected as the model buildings for trial calculation. It is noted that the damage functions and fragility curves were developed analytically in advance. Remarkable results related to seismic risk reduction are summarized as follows;</p><p>1. the lager the natural periods of buildings are separated, the bigger the effect on the seismic risk reduction is,</p><p>2. the number of buildings in the portfolio affects the seismic risk reduction, and,</p><p>3. the magnitude of inter-period correlation of spectral accelerations gives the large effect on the seismic risk reduction.</p>

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