Residual strength evaluation of steel cabinet in nuclear power plant under a fire event

The residual strength evaluation under a quasi-static loading system after a fire event in an electrical cabinet of an NPP is the main concern of this study. The capacity reduction, ductility displacement change, local joint behavior estimation, maximum displacement changes with corresponding base shear show the residual performance. The full-scale three-dimensional finite element model (FEM) is generated by considering the constitutive material model to adopt the fire event. Modal parameter estimation is taken into account to capture the dynamic property of the cabinet by the shake table test for comparing the fundamental frequencies, which leads to the calibration of the FEM. The quasi-s residual strength; fire-damaged FEM; capacity degradation; displacement ductility; local joint behavior tatic load has been applied under the fire event along with the gravity load to get the reduction pattern of the structural performance. The results analysis shows that the elevated temperature due to fire has a significant impact on the cabinet, on which the capacity reduction expresses an abrupt change after a specific temperature. This is also notified in the displacement ductility, joint behavior as well as maximum displacement change.