Experimental Seismic Response of a Full-Scale Cold-Formed Steel-Framed Building. I: System-Level Response
Publication: Journal of Structural Engineering
Volume 142, Issue 12
Abstract
The objective of this paper is to provide details of the design and response of a full-scale cold-formed steel (CFS)-framed building that was tested under a series of dynamic excitations during different phases of construction. The seismic response of complete buildings framed from CFS is essentially unexplored, although significant work on the behavior of CFS members and subsystems, particularly shear walls has been conducted. The experiments described herein are the first tests of a CFS-framed building designed to North American seismic standards. Seismic testing was conducted using the twin shake tables at the University at Buffalo through the U.S. National Science Foundation Network for Earthquake Engineering Simulation program. The project was conducted in two phases. In the first phase, the building specimen was constructed and tested with only the structural components in place: CFS shear walls sheathed with oriented strand board (OSB), CFS gravity walls (unsheathed), and CFS-framed floor and roof diaphragms sheathed with OSB. Nondestructive testing and design basis earthquake-level testing were performed in this phase. In the second phase, a second building specimen was constructed, to identical specifications as in the first phase. However, the second building specimen was finished with nonstructural components including exterior sheathing of the perimeter gravity walls, gypsum-board sheathing of the interior of the perimeter gravity and shear walls, interior partition walls, ceilings, staircases, and exterior weatherproofing. Nondestructive testing was conducted at construction milestones, and the finished second-phase specimen was destructively tested at the maximum considered earthquake level. This paper presents the fundamental system-level response of these building specimens: period, percent damping, drift, and accelerations. The companion paper details component-level response. Overall, the work demonstrates the excellent performance of these structures under seismic excitation, while highlighting that this performance is related to the full system-level response and not just the designated elements in the lateral-force-resisting system.
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Acknowledgments
The authors would like to thank the National Science Foundation (NSF-CMMI No. 1041578), American Iron and Steel Institute (AISI), ClarkDietrich, Steel Stud Manufacturers Association, Steel Framing Industry Alliance, Devco Engineering (notably Phil Clark), Mader Construction, DSi Engineering, Simpson Strong-Tie, the members of the Industrial Advisory Board (Renato Camporese, Thomas A. Castle, Kelly Cobeen, L. Randy Daudet, Richard B. Haws, Jay Parr, and Steven B Tipping), and additional industry liaisons (George Frater, Don Allen, Tom Lawson, and Fernando Sessma). The views expressed in this work are those of the authors and not those of NSF, AISI, or any of the participating companies or advisors. Furthermore, the authors are immensely grateful to the SEESL staff, especially Mark Pitman, for their invaluable help and advice.
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Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 3, 2015
Accepted: Mar 21, 2016
Published online: Jul 13, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 13, 2016
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