عنوان مقاله [English]
Today, steel moment resistance connections are the most common type of connection widely used in steel structures, and they certainly play a significant role in retrofitting, reliability and economic benefits. Their use also improves the quality and useful life cycle of buildings. Considering their basic importance, and after the Northridge earthquake, the invention of RBS connections was a turning point in resistant steel moment connections. In RBS connections, a reduction of the beam flange at the end of the beam causes the plastic modules of the section to be reduced and the plastic hinge of the beam to be far from the column. This research observes the seismic behavior of the RBS connection, with a reduced section of the flange and a new AW-RBS with a reduced section of the web in a double section beam, which is particularly applicable in Iran. Double sections of I-beams have high torsional stiffness and are used in steel moment resistance frames. The seismic behavior of these frames needs to be investigated when conjugated with high performance AW-RBS connections. These observations are undertaken using ABACUS nonlinear finite element software. Experimental data from the literature were used for verification of our modeling in the finite element method. Many models were put under cyclic loads and ductility, and energy absorption and plastic behavior in the reduced section were studied. Parameter studies were included as the shape of cutting in the beam flange and the height of the web in double beams. Results from the studied connections show that AW-RBS has the least resistance and stiffness decrease; 8% has been cut off the rotation of the story and the models have acceptable behavior in cyclic loads. In double beam sections, the existence of two webs as folded plates in the reduced region causes the delay of lateral buckling and lateral torsional buckling, which makes the workability of the connection increase.