Seismic Column Demands in Ductile Braced Frames
Publication: Journal of Structural Engineering
Volume 135, Issue 1
Abstract
In ductile braced frames, column seismic demands depend on the strength of ductile elements and yielding patterns that occur during earthquake loading. Column demands were investigated in buckling restrained braced frames (BRBFs), special concentrically braced frames (SCBFs), and eccentrically braced frames (EBFs) with different heights (3, 9, and 18 story) and strength levels using nonlinear time history analysis. For columns at the base of 9- and 18-story BRBFs and EBFs, axial demands observed from the analyses were 55–70% of demands commonly used in design, indicating potential cost savings on columns, anchor rods, base plates, and foundations in tall buildings; however, in low-rise SCBFs with braces in the 2-story X-configuration, column axial demands were up to 100% greater than those commonly used in design because of force redistribution that occurs after brace buckling. Column rotations in all frames were less than . These rotation demands are lower than rotation capacities that have been demonstrated in other work.
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Acknowledgments
This work was possible due to support from Brigham Young University. Matt Merrell, former student at Brigham Young University, assisted in the design of the frames used in the study. Feedback from reviewers significantly improved the paper.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 1 • January 2009
Pages: 33 - 41
Copyright
© 2009 ASCE.
History
Received: Jul 27, 2007
Accepted: May 29, 2008
Published online: Jan 1, 2009
Published in print: Jan 2009
Notes
Note. Associate Editor: A. M. Kanvinde
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