構造物の地震リスクの簡便な評価方法について－リスクダイアグラムとその適用－

 In the seismic risk analysis of structures, information on seismic hazard and seismic fragility are required. Both hazard and fragility functions ( or curves ) are convolved numerically, and seismic risk ( or annual probability of failure ) of the structure is evaluated. In this paper, a simplified method for seismic risk evaluation is proposed, where information on the seismic hazard curve and the capacity of the structure are used and numerical integration is not required, and the seismic risk can be obtained graphically from the hazard curve. The proposed method is demonstrated using seismic hazard curves at two sites. Theoretical background of the method is considered from the closed form risk equation.