震源特性の不確定性が地震動強さや建物応答に及ぼす影響

Abstract

In this study, structural response analyses with ground-motion time histories are conducted for an RC structure. These ground motions incorporate the uncertainties of macro-scopic and micro-scopic seismic-source characteristics. The purpose of this study is to examine the relationship between the uncertainties of seismic-source characteristics, seismic intensities and structural responses. As a result, it is clarified that seismic moment M0, stress drop Δσ and Q-value coefficient CQc positively correlate with seismic intensities and maximum structural responses. It can also be seen that M0 highly correlates with velocity, displacement and energy indices of seismic intensities, and that Δσ and CQc highly correlate with acceleration related indices. The reasons are discussed referring to the effect of the varieties of source characteristics on the ground-motion Fourier spectra from the discrete faults. The asperity location aspX negatively correlates with seismic intensities and with maximum structural responses because of the location between the reference site and faults. It is also detected that seismic intensities, M.S.I. and Ajma, can be better as hazard indices because the variations of structural responses along these indices are relatively smaller than those along other intensities.