Comparative Study on Evaluation of Inelastic Energy Absorption Capacity for Seismic Fragility Analysis of Structures

구조물의 지진취약도분석을 위한 비탄성에너지흡수능력의 평가 기법에 관한 비교 연구

This paper introduces the technologies related to seismic resistance assessment of nuclear power plant structures by seismic fragility analysis(SFA). The inelastic energy absorption factor is considered in SFA to represent the effects due to the nonlinear behavior of structures and has a significant effect on the seismic fragility that is a probability of failure of structures by earthquake. Several practical methods to evaluate the inelastic energy absorption capacity of structures are investigated. The capacities determined by those methods are compared with each other. And an improved method that uses the inelastic demand capacity diagram is presented. Conclusively, some comments on each method for practical application are made.