耐震設計用地震動の設定法に関する話題(<小特集>関連分野との技術融合)

概要

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After introducing the several topics to define design earthquake motions considering observed earthquake motions during the 1995 Hyogoken-Nanbu earthquake we concentrate discussions on the importance of phase spectrum to simulate a design earthquake motion. For generating a sample phase spectrum we introduce a stochastic simulation model of phase spectra based on the concept of group delay time. A design spectrum compatible earthquake motion can be simulated by using this sample phase but the nonlinear structural response characteristic is strongly affected by the selected sample phase. A method is therefore proposed to choose a unique phase spectrum from the mother set of phase spectra defined by the developed stochastic phase model. We also refer to the causality condition of earthquake motion and a method to simulate phase spectrum using the stochastic differential equation.
2007-02-01