Abstract. Using damping system in building frames would decrease response and entrance of energy to the structure and protects the buildings from happening collapse. By attending to this point that the non-linear behavior of the steel frames with semi-rigid connections and hysteric dampers and determining its behavior factor is not investigated yet, in this research, investigation of these frames are studied. In present work, steel frames with the rigid, hard semi-rigid, flexible semi-rigid and pin connection by ADAS dampers, in the three heights of 4story, 8story and 12story, in the three bays are analyzed by pushover analysis procedure to establish their behavior factor. And also a comparison is done between frames with ADAS damper and frames without them. In this way, we use calculated Behavior factor for frame with ADAS damper and Behavior factor from 2800 regulation for frame without them, and these frames are analyzed by linear analysis and the results are compared in different cases such as period of first mode, base shear, story drift and total displacement for each story. Keywords: Hysteric dampers; Semi-rigid connections; Non-linear behavior; Behavior factor