An overview of the performance of various types of Reduced Beam Section (RBS)

An overview of the performance of various types of Reduced Beam Section (RBS)

Phenomenological Aspects of Civil Engineering (PACE) - an International Congress
Volume 1 - Issue 1 - PACE-2021

Alireza Behravesh


The most common event that results in a structure being destroyed by seismic loading is the failure and destruction of the beam-column connection. The Northridge earthquake showed that the use of special bending frames and beam-to-column coupling with full welding could not prevent the crisp failure if the technical principles in the design and implementation of steel structures were met. The reason for this was the insufficient flexibility of the bending of steel bending frames. The widespread use of the system was thought to have a high plastic deformation capacity, but the 1994 Northridge earthquake and the 1995 Kobe Japan earthquake caused many beam-to-column connections to experience brittle failure. At Northridge 200 steel bending frames encountered unexpected cracks in the beam-to-column connection, most of these connections never extending beyond the column due to the sudden failure of the beam. In this regard, solutions were proposed to remove the plastic joint from the column, including the design of new joints that could withstand large earthquakes, and a Reduced Beam Section connection. That was the solution. This method gives the frame flexibility and creates a plastic joint at the cross-section that can absorb a great deal of energy and ultimately disperse the absorbed energy by structural oscillations and plastic joints. Another proposed solution for controlling the steel fittings is the use of slotted dampers.


Rbs-Reduced beam section-Abaqus-beam-Northridge