Stability Requirements for Beams in Seismic Steel Moment Frames
Publication: Journal of Structural Engineering
Volume 132, Issue 9
Abstract
An analytical study was conducted on the cyclic loading behavior of beams in steel moment frames. Lateral–torsional buckling and local buckling were explicitly considered in the analysis. Beam cross-sectional dimensions were varied to represent a wide range of rolled wide flange shapes. The unbraced length of the beams corresponded to slenderness ratios about the weak axis ranging between 60 and 100. Based on the analyses, flange and web width-thickness limits were established that would permit the beam to achieve various target rotation capacities. These limits are presented in terms of limit curves which plot the flange width-thickness ratio against the web width-thickness ratio. The limit curves clearly show strong flange–web interaction. Different limit curves were developed for a range of target rotation angles, weak axis slenderness ratios, and residual strength levels. Postbuckling behavior and strength degradation mechanism were studied. The results of the analyses are compared against current building code requirements for beam stability in seismic steel moment frames, and the adequacy of the current code requirements are evaluated.
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Acknowledgments
The writers gratefully acknowledge funding provided by the Japanese Ministry of Education, Culture, Sports, Science, and Technology (Base Research Category S: No. UNSPECIFIED14102028). The second writer expresses gratitude for the sponsorship provided by the Twenty-First Century Center of Excellence (COE) Program awarded to the Disaster Prevention Research Institute, Kyoto University. The opinions expressed in this paper are those of the writers and do not necessarily reflect the views of the sponsors.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 9 • September 2006
Pages: 1334 - 1342
Copyright
© 2006 American Society of Civil Engineers.
History
Received: Oct 28, 2004
Accepted: Nov 29, 2005
Published online: Sep 1, 2006
Published in print: Sep 2006
Notes
Note. Associate Editor: Marc I. Hoit
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