Impact of Residual Stresses and Initial Imperfections on the Seismic Response of Steel Moment Frames
Publication: Journal of Structural Engineering
Volume 138, Issue 7
Abstract
The 2010 AISC specification establishes the direct analysis method (DM) as the standard stability analysis and design procedure. Although the DM has important benefits over conventional stability design methods, the interface between the DM, the AISC seismic provisions, and the seismic design requirements in ASCE-7 is not fully established. Because the DM, which was developed for design scenarios that do not contain seismic loading, includes the effects of initial geometric imperfections and inelastic behavior owing to residual stresses, it is critical to explore the impact of these parameters on the seismic behavior of typical steel buildings. To examine these issues, a series of steel special moment-resisting frame models were subjected to monotonic pushover, cyclic pushover, and response history analyses. The observed behavior was used to draw comparisons between systems with and without residual stresses and initial imperfections. Cyclic strength degradation at beam-to-column connections was also considered to examine the potential interaction it may have with the other parameters. Whereas the well-known impact of strength degradation on cyclic stability was noted, residual stresses and initial imperfections did not have any appreciable effect on stability behavior for the systems considered. The analyses conducted in this study indicate no clear benefit to using the DM when designing regular ductile steel systems in high seismic regions and simpler design methods may be equally effective.
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Acknowledgments
The work described in this paper was conducted as part of an ASCE/SEI special project entitled “Interface of the Direct Analysis Method and Seismic Design Requirements.” This project was conducted under the Technical Committee on Methods of Design (TAC Metals) and the writers thank the committee members for input throughout the course of this research. In particular, the advice of Professor Donald W. White of Georgia Tech, past chair of the committee, is gratefully acknowledged. The computational simulations described herein were conducted in part using an allocation through the TeraGrid Advanced Support Program. All opinions, findings, and conclusions expressed are those of the writers.
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Information
Published In
Journal of Structural Engineering
Volume 138 • Issue 7 • July 2012
Pages: 942 - 951
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Mar 30, 2011
Accepted: Sep 22, 2011
Published online: Sep 26, 2011
Published in print: Jul 1, 2012
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