Residual Drift Response of SMRFs and BRB Frames in Steel Buildings Designed according to ASCE 7-05
Publication: Journal of Structural Engineering
Volume 137, Issue 5
Abstract
A recent study has shown that residual drifts after earthquakes that are greater than 0.5% in buildings may represent a complete loss of the structure from an economic perspective. To study the comparative residual drift response of special moment-resisting frames (SMRFs) and buckling-restrained braced (BRB) frames, buildings between 2 and 12 stories in height are designed according to ASCE 7-05 and investigated numerically. This investigation includes pushover analyses as well as two-dimensional nonlinear time-history analyses for two ground motion hazard levels. The two systems show similar peak drifts and drift concentration factors. The BRB frames experience larger residual drifts than the SMRFs; however, the scatter in the residual drift results is large. Expressions are proposed to estimate the residual drifts of these systems as a function of the expected peak drifts, the initial recoverable elastic drift, and the drift concentration factor of each system. When subjected to a second identical earthquake, both framing systems experienced larger-than-expected drifts when an initial drift greater than 0.5% was present.
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Acknowledgments
Financial support for this project was provided by the Natural Sciences and Engineering Research Council of Canada under the Idea to Innovation (I2I) program.
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Published In
Journal of Structural Engineering
Volume 137 • Issue 5 • May 2011
Pages: 589 - 599
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 12, 2009
Accepted: Aug 23, 2010
Published online: Aug 24, 2010
Published in print: May 1, 2011
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