Analytical Study On Modified Reduced Beam Section Connections Under Cyclic Behaviour

Abstract

Steel frames with column and beam connections welded together show brittle nature during earthquakes. According to previous researches, the major damages were the cracks developed in the welded portion between the beam flange and the face of the column. Such cracking results in accumulation of unwanted stresses in the welded region. Reduced Beam Section (RBS) method is an effective way to limit the accumulation of stress in the vicinity of beam column joint. Out of different advanced beam to column design approaches developed after the earthquakes in Northridge in 1994 and Kobe in 1995, the reduced beam section connection has proven satisfactory ductility levels in numerous tests. The use of RBS in beams to column connections results in the formation of plastic deformations at a certain distance from the beam column joint. In the present study new types of reduced beam sections have been modeled using ANSYS 16 software by trimming the beam flange in different pattern and is compared each other under cyclic behavior. The results obtained from this study have shown that the reduced beam section with same holes dissipates more energy than other type of connections.