عنوان مقاله [English]
Investigations following the 1994 Northridge earthquake in California showed that conventional BWWF (Bolted Web Welded Flange) connections in steel moment resisting frames were damaged during the ground motion. According to scientists investigations, the RBS (Reduced Beam Section) connection was introduced, in which the beam section tapers locally in a region near the column face. This induces the plastic hinge away from the column face and dissipates the energy of the seismic loads. This paper describes a new and improved RBS connection. This enables the section to be loaded more heavily without compromising its lateral buckling resistance. An extensive parametric study has been undertaken to evaluate the performance of the connection. Also a new criterion is proposed that describes the strength degradation beyond the maximum carrying capacity of the section.