Reza Attarnejad - Associate Professor, Department of Civil Engineering, University of Tehran, Tehran, Iran
Milad Roohi Ghareshiran - MSc student in Earthquake engineering, University of Tehran, Tehran, Iran
Akbar Pirmoz - PHD candidate in Earthquake engineering, University of Tehran, Tehran, Iran

To reduce dynamic response of a semi-rigid frame with bolted connections, energy dissipation materials may be placed at a connection between the end plate and column flange or between the angle and member flange. In this article a three-span three bay frame with semi-rigid connections having threedifferent capacities and energy dissipation materials analytically modeled by idealizing semi-rigid connection and energy dissipation materials as rotational spring and damper, respectively. The numerical model included nonlinear connection behavior, member yielding and geometrical nonlinearity of thestructure. The pushover and dynamic analyses of the frames were performed using OPENSEES analysis program and dynamic analyses of frames with and without connection dampers show that there is an optimal damper damping coefficient by which the seismic responses of semi-rigid frame, including lateral displacements can be significantly reduced

Semi-rigid frame, Semi-rigid connection, bolted connection, Damper, Seismic response