In design codes, the ductility capacity of specific members (fuses) outside the elastic zone is considered, rather than keeping all structural members in the elastic zone. Hence, the required strength of the structure is divided by the behavior factor, and the fuses capable of absorbing and dissipating the earthquake energy will reduce the damage in other members. In this paper, the triangular-plate added damping and stiffness (TADAS) dampers are evaluated as ductile members (fuses). The performance of these dampers depends on the geometry (thickness and number of plates). Therefore, in the present study, this type of damper was modeled in ABAQUS software with different geometries and the push-over analysis was performed. The changes in the behavior factor of the structure were then evaluated by installing the dampers in the steel moment resisting frames and performing the nonlinear static analysis. The results show that in the frame without the damper, due to the axial behavior observed in the members, the ductility was equal to 3.5, while in the frame provided with the damper, due to the decrease in the force levels of the floors, the ductility was increased to 10.