核电设备地震易损度混合分析法的改进OA

This paper introduces the hybrid method for computing the seismic fragility of equipment in nuclear power plants,and analyzes the potential errors in seismic capacity and fragility due to employing the hybrid method.It also presents the improved hybrid method which has been developed overseas in recent years to correct the biases.However,the discussions on the hybrid method and the improved hybrid method in foreign literature are almost limited to the simplified expression where the elastic strength factor is linear.Taking the shear-tension interaction failure mode of the critical anchor bolt of a daily fuel tank as an example,this paper discusses about the application of both methods in case of a relatively complicated situation that involves a nonlinear formulation of the elastic strength factor.In comparison with the results from the conventional hybrid method,this paper shows that the improved hybrid method can estimate the seismic fragility of equipment more accurately while maintaining the advantage of simple and easy calculations.