Seismic Performance of Low-to-Moderate Height Eccentrically Braced Steel Frames Designed for North American Seismic Conditions
Publication: Journal of Structural Engineering
Volume 138, Issue 12
Abstract
The global seismic response of 3- and 8-story eccentrically braced frames (EBFs), designed for western and eastern North American locations, is studied using nonlinear time history analysis. Analytical models were built in three computer programs. Similar maximum forces were obtained, but the inelastic deformation predictions at the element and global structural levels showed sensitivity to the modeling employed. This feature should be considered in seismic performance assessment or design. Current design methods failed to predict interstory drifts and plastic link rotations, but the study confirmed the strong correlation between the two parameters associated with rigid-plastic behavior. The influence of yielding and flexural buckling of frame members, other than the links on the global frame performance, was evaluated using the OpenSees model. It was confirmed that the flexural yielding of outer beams is acceptable for EBFs with short and intermediate links, if the combined flexural strength of the braces and beams is at least equal to the expected end-link moments and the braces can resist the associated axial force-bending moment demand. Inelastic response of braces and columns in such frames did not negatively impact the overall frame behavior.
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Acknowledgments
This study was financially supported by the Natural Science and Engineering Research Council of Canada. We thank Professor Taichiro Okazaki from the University of Minnesota for providing the test data on EBF shear links and Professor James Ricles from Lehigh University for providing the ANSR-1 software with the link element. Charles-Philippe Lamarche, former Ph.D. Candidate at Ecole Polytechnique of Montreal, is also acknowledged for his valuable contribution to the development of the OpenSees models.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 138 • Issue 12 • December 2012
Pages: 1465 - 1476
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Mar 1, 2010
Accepted: May 20, 2011
Published online: Nov 15, 2012
Published in print: Dec 1, 2012
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