Design Strengths of Cold‐Formed Channels in Bending and Torsion
Publication: Journal of Structural Engineering
Volume 120, Issue 5
Abstract
Channel sections in flexure, when not attached to deck or sheeting, are designed according to the American Iron and Steel Institute's equations for lateral‐torsional buckling. These formulas assume an unbraced length with equal and opposite end moments, and only torsional restraints at the braces. These formulas tend to overestimate the buckling strength in some cases, especially where there are two or more intermediate braces within a span length. The reason for this is that the failure mode may be something other than lateral‐torsional buckling. In fact, tests have shown that highly braced members usually fail by distortional buckling of the flange‐lip intersection at a braced point. The present paper reports a series of experiments on channels with various bracing schemes and offers a mathematical prediction model for the ultimate strength of a channel in flexure.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Addendum to the specification for the design of cold formed steel members. (1989). American Iron and Steel Institute, AISI, Section C3.1.2, Section B2.1, Washington, D.C.
2.
Chajes, A. (1974). Principles of structural stability theory. Prentice‐Hall, Englewood Cliffs, N.J.
3.
Ellifritt, D. S., Sputo, T., and Haynes, J. (1992). “Flexural strength and deflections of discretely braced channel and zee sections.” Proc., 11th Int. Specialty Conf. on Cold‐Formed Steel Design, Univ. of Missouri, Rolla, Mo.
4.
Hill, H. (1954). “Lateral buckling of channels and zee beams.” Trans., ASCE, 119, 829–841.
5.
Kavanagh, K. T. (1980). “Failure of cold formed steel purlins near points of concentrated load.” Proc., 7th Australasian Conf. on the Mech. and Struct. of Mat., Univ. of Western Australia, Perth, Australia.
6.
Krajcinovic, D. (1969). “A consistent discrete elements technique for thin‐walled assemblages.” Int. J. Solids and Struct., 5(7), 639–662.
7.
“Specification for structural steel buildings, LRRD.” (1986). American Institute of Steel Construction (AISC), Chicago, Ill.
8.
“Steel structures.” (1990). AS4100, Standards Association of Australia, North Sydney, Australia.
9.
Timoshenko, S., and Gere, J. (1961). Theory of elastic stability. McGraw‐Hill Book Co., New York, N.Y.
10.
Winter, G. (1943). “Lateral stability of unsymmetric I beams and trusses.” Trans., ASCE, 198, 247–260.
11.
Winter, G. (1944). “Strength of slender beams.” Trans., ASCE, 109, 1321–1349.
12.
Winter, G. (1947). “Discussion of ‘Strength of beams as determined by lateral buckling,’ by Karl deVries.” Trans., ASCE, 112, 1272–1276.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 5 • May 1994
Pages: 1599 - 1607
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Oct 9, 1992
Published online: May 1, 1994
Published in print: May 1994
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.