improvement of the performance of reduced-level steel beams (rbs), by a new type of stiffener, under cyclic loading

Bending joints before the earthquake of the northeastern were fitted with a beam to the column. this clamping is done by welding the entire beam between the beam and the column or the welded wing of the beam to the column head and twistedround beam to the wing column. at that time, it was thought that these fittings would perform well against earthquake forces. after the northridge earthquake in 1994 in los angeles, most of the structural failure was due to weakness in its joints, so researchers proposed two ways to enhance the bond strength and the local weakening of the beam in the vicinityof the rbs connection. in the connection boosting strategy, the goal is to reduce tensions in the connection. the purpose of creating a plastic joint in the beam is deliberately designed in the direction of the local weakening of the beam in the vicinityof the connection, in order to avoid the plasticity of the connection and failure in it.