Seismic Assessment of Concentrically Braced Steel Frames with Shape Memory Alloy Braces
Publication: Journal of Structural Engineering
Volume 133, Issue 6
Abstract
The use of special concentrically braced frames has increased since the 1994 Northridge and 1995 Hyogoken–Nanbu Earthquakes. However, past performance suggests limited ductility and energy dissipation in braced frame systems due to buckling of conventional braces. In order to address this limitation, three- and six-story concentrically braced frames with superelastic shape memory alloy (SMA) braces are studied to evaluate their seismic performance in comparison to traditional systems. SMAs are unique metallic alloys that have the ability to undergo large deformations while reverting back to their original undeformed shape providing recentering capabilities to the braced frame. Detailed analytical models of the frames with SMA braces are developed and two suites of ground motions are used to evaluate the structures with respect to interstory drift and residual drift. The results suggest that the SMA braces are effective in limiting interstory drifts and residual drifts during an earthquake, in part, due to the recentering nature of superelastic SMAs.
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Acknowledgments
This study has been supported primarily by the CAREER Program of the National Science Foundation under Grant No. 0093868. Davide Fugazza would like to acknowledge the financial support of the Italian National Civil Protection Department, which through its Servizio Sismico Nazionale Section, provided a scholarship. The findings and conclusions of this paper, however, are those of the writers alone.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 6 • June 2007
Pages: 862 - 870
Copyright
© 2007 ASCE.
History
Received: Sep 16, 2005
Accepted: Nov 28, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Marvin W. Halling
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