Full-Scale Test Behavior of Cold-Formed Steel Roof Trusses
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Volume 132, Issue 4
Abstract
Ten full-scale roof trusses fabricated from cold-formed steel channel sections were tested to ultimate capacity under concentrated panel point loading. As the test program moved forward and failure modes became manifest, various practical means of increasing truss capacity were investigated. While gusset plates at the heel connections in bearing were a significant factor in strength determination, local buckling of the top chord adjacent to the heel plates was the predominant failure mechanism. Trusses that experienced this local buckling failure exhibited postbuckling ductility, whereas failures at the connections in bearing were sudden. A truss was subjected to partial point loading to simulate the effect of a partial roof snow load and the experimental ultimate capacity substantiated the predicted capacity. A beam–column analysis of the top chord in the region where failure occurred was performed in accordance with the requirements of the Canadian Standards Association CSA S136-01. The calculated nominal resistance was 12% conservative as compared to the experimental ultimate capacity of the truss. The trusses were sufficiently stiff to satisfy a deflection requirement of the span length divided by 360.
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Acknowledgments
The material required for specimen fabrication was generously donated by Bailey Metal Products. Financial assistance was provided by the Canadian Sheet Steel Building Institute, the Steel Structures Education Foundation, and the Natural Science and Engineering Research Council.
References
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Canadian Sheet Steel Building Institute (CSSBI). (1997). “Residential steel framing: Steel truss design guide.” Standard S12-97, Cambridge, Ont., Canada.
Canadian Standards Association (CSA). (2002). “North American speci-fication for the design of cold-formed steel structural members.” Standard S136-01, Mississauga, Ont., Canada.
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Dawe, J.and Wood, J.(2006). “Small-scale test behavior of cold-formed steel roof trusses.” J. Struct. Eng., 132(4), 608-615.
Harper, M., LaBoube, R., and Yu, W. (1995). “Behavior of cold-formed steel roof trusses. Civil Engineering Study 95-3; Cold Formed Steel Series.” Masters thesis, Dept. of Civil Engineering, Univ. of Missouri–Rolla, Rolla, Mo.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 4 • April 2006
Pages: 616 - 623
Copyright
© 2006 ASCE.
History
Received: Nov 1, 2004
Accepted: Oct 17, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
Notes
Note. Associate Editor: Benjamin W. Schafer
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