Y-shaped steel braces one of the systems is the lateral load. These braces, despite having the performance good architecture and resistance and hardness acceptable, they are not ductility. The use of dampers, such a rotary friction damper can increase their ductility capacity. The purpose of this paper is to evaluate the seismicity of y-shaped braces with rotary frictional damper. For this purpose, a frame of a floor and a span with y-shaped brace was selected and evaluated in two cases with and without rotary frictional damper. In evaluating these two frame, the stiffness, strength and energy absorption were considered. The results show that the strength and stiffness in the case with the damper decreases by 20% and 35%, but the energy absorption increases by 50%.
