Cyclic Response and Design Recommendations of Reduced Beam Section Moment Connections with Deep Columns
Publication: Journal of Structural Engineering
Volume 128, Issue 4
Abstract
Design engineers frequently use deep columns in steel special moment resisting frames to control drift. As the reduced beam section (RBS) moment connection is becoming popular after the 1994 Northridge, California earthquake, the SAC Joint Venture initiated a testing program to study the cyclic behavior of deep-column RBS moment connections. The test results showed that the deep column is prone to twisting. The twisting was caused by the eccentric beam flange force due to lateral-torsional buckling of the beam. In this paper, cycle tests results of three RBS moment connections with deep columns are presented. An analytical study showed that the warping stress is highly dependent on the ratio of the column section. A design procedure is proposed that can be used to evaluate if column twisting is a concern. Additional bracing near the RBS region is recommended if the design procedure indicates high stresses.
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Information
Published In
Journal of Structural Engineering
Volume 128 • Issue 4 • April 2002
Pages: 464 - 473
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Dec 8, 2000
Accepted: Sep 12, 2001
Published online: Apr 1, 2002
Published in print: Apr 2002
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