Maximum Load Design of Cold-Formed Steel-Channel Beams

by Akio Hasegawa, (A.M.ASCE), Postdoctoral Fellow; Univ. of Waterloo, Ontario, Canada; formerly, Assoc. Prof. of Civ. Engrg., Nagoya Inst. of Tech., Nagoya, Japan,
Niels C. Lind, (M.ASCE), Prof.; Dept. of Civ. Engrg., Univ. of Waterloo, Ontario, Canada,
Wilfred B. Hall, NRC Research Fellow; Dept. of Civ. Engrg., Univ. of Waterloo, Ontario, Canada,


Serial Information: Journal of the Structural Division, 1978, Vol. 104, Issue 7, Pg. 1093-1107


Document Type: Journal Paper

Abstract: An alternative to minimizing the weight of a cross section for a specified load is to maximize the load capacity of a structural member of a specified weight. General conditions for equivalence of maximum load design and minimum weight design are given, and advantages of the former are pointed out. Application of the method to cold-formed channel beams results in general optimal relationships that can be expressed in very compact dimensionless form. It is concluded that in order to realize the maximum benefit of flange stiffening the web should also be stiffened. The optimal lip stiffener has a depth equal to the code minimum. Continuous spans are sometimes inferior to multiple single spans, and do not affect optimal profiles appreciably.

Subject Headings: Load bearing capacity | Maximum loads | Load and resistance factor design | Minimum weight design | Stiffening | Beams | Cold-formed steel

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