In the analysis of damage to a structure after the occurrence of a destructive event, it is impossible to estimate the exact amount of damage to any part of the structure. Therefore, it is necessary to introduce failure indicators to assess the amount of damage to structural elements. For this purpose, in this study, the damage caused to the coupled-steel plate shear wall (C-SPSW) system under earthquake load was investigated. In this paper, three damage index of park and Ang, ductility and drift using numerical methods upon multi-story C-SPSW systems are investigated. Following the validation of the numerical simulation through a comparison of the experimental results and numerical predictions, a parametric study was performed to evaluate the damage indexes. Comparative results of the hysteresis curves obtained from the finite element analysis with the experimental curves indicated that the finite element model offered a good prediction of the hysteresis behavior of C-SPSW. In the parametric study, Thirty prototype multi-story C-SPSW systems with different the height of the structures were designed, modeled, and using nonlinear seismic analysis. The results show that the use of cumulative damage indices, which is a combination of several different failure parameters, it predicts the vulnerability of structures more realistically.
