Experimental and numerical steel moment frames with pin-fuse with slotted bolted friction damper (pin-fuse SBC)

By examining the results related to the Northridge earthquakes in 1994 and other destructive earthquakes, it was observed that strengthening the structural members and increasing the length of the welding line of beam-to-column connections in steel structures did not have a suitable seismic performance. After that, to prevent the brittle failure of the connections, the way of forming the plastic joint outside the connection area was investigated and beams with a reduced cross-section were proposed. But less attention has been paid to the use of absorbers in bending frames. The proposed pin-fuse connection, (pin-fuse SBC), is one of the connections that can absorb the incoming forces near the connection through sliding and friction. When an earthquake occurs, the pin-fuses acts through the rotational sliding of the steel surfaces towards each other, the presence of friction between the fuse plates will cause the consumption of the earthquake energy. Frames equipped with pin-fuses, this frame has the ability to absorb high energy through said fuses, it can be used in areas with strong seismic activity. In the model proposed in this research, the intended connection of a real joint near the beam-to-column connection is designed with bean-shaped holes that can rotate and move after reaching an anchorage lower than the connection moment. Therefore, the experimental results of the proposed model under cyclic loads have been investigated and compared with the numerical results of finite elements. These results show that the pin fuse connection after reaching the required limit and due to the removal of the contribution of the web from the bending resistance and the absence of torsional buckling in the beam web and by creating a safe fuse away from the connection of the beam and the column, in addition to the resistance of the fuse pin connection and plasticity has increased by 11% and 6%, respectively, it has been able to reach a relative displacement of up to 9%, which is more than the regulation limit in special bending frames.