Lateral buckling strengths of unsheeted cold-formed beams

Abstract This paper provides a survey of the state of knowledge on the lateral buckling strength sof unsheeted cold-formed steel beams. Topics included are elastic lateral buckling, the effects of imperfections and residual stresses, and local and distortional buckling. Consideration is also given to the bending and torsion of eccentrically loaded channel beams, the biaxial bending of Z-beams loaded in the plane of the web, and the distortional buckling of U-beams. It is found that design methods for cold-formed beams are derived from methods for hot-rolled columns, and that there are very few experimental results that can be used to assess present methods. A tentative new design approach to biaxial bending and torsion is proposed, but this cannot be properly assessed without experimental evidence of the strengths of eccentrically loaded channels and of Z-beams in biaxial bending.

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