Rational Design of Light Gage Beams

by Jeffrey L. Bleustein, Asst. Prof. of Engrg. and Appl. Sci.; Dept. of Engrg. and Appl. Sci., Yale Univ., New Haven, CT,
Atle Gjelsvik, Assistant Professor; Dept. of Engrg. and Appl. Sci., Yale Univ., New Haven, CT,

Serial Information: Journal of the Structural Division, 1970, Vol. 96, Issue 7, Pg. 1535-1541

Document Type: Journal Paper


A method for analyzing light gage cold-formed steel beams with buckled flanges in situations when the bending moment changes sign is described. If the bending moment changes sign, the standard procedure using the same effective width for each buckled flange over the whole length of the beam breaks down. Instead, separate effective widths are established for the compression flanges of each part of the beam with a bending moment of the same sign. The points of zero bending moment are not known a priori and their determination is part of the solution. The governing equations are highly nonlinear and have to be solved by a numerical process of successive approximations. The approximations were found to converge very rapidly.

Subject Headings: Moment (mechanics) | Steel beams | Flanges | Bending (structural) | Beams | Cold-formed steel | Buckling | Professional societies

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