Widespread damage to steel moment frame structures during the 1994 Northridge and 1995 Cobe earthquakes led researchers to develop alternative connection designs to the prescriptive pre-Northridge moment connection. Two key concepts have been developed to provide highly ductile response and reliable performance; strengthening the connection and/or weakening the beam framing to the column, in order to avoid damages of the respective column. The weakening of specific sections of the beam in order to change them into reliable energy dissipative zones, in case of an earthquake, is an idea which was developed in principle in the late '80s by Andre Plumier. There has been previous testing on the RBS moment connections which heralds the effectiveness of the new approach in the post-Northridge design era. The reduced beam section (RBS), allows controlled yielding of the beam by moving the plastic hinge region at the beam -in a short distance from the column's face-protecting the connection from any type of failure.Various shapes cutouts are possible (constant, tapered or radius cut) to reduce the cross sectional area. Extensive experimental and analytical projects have been conducted demonstrating that the curved RBS behaves with the highest rotational capacity. Recommendations for the design and detailing of the RBS member were prescribed in FE-MA 350 and FEMA 351, regarding the location and reduction rate of RBS, based on the local performance of tested beam to column assemblies. In Europe, also, following the concept of the above mentioned recommendations, in EC8, Part 3, design of such type of connections is presented.xvi the need for further investigation -concerning the effectiveness of the RBS use in this type of connections and for the possible readjustment of the geometrical characteristics of the RBS -is imperative in order to be safely applied to the European profiles.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.