Abstract
The Direct Strength Method (DSM) has been an available option for the design of cold-formed steel members in the American Iron and Steel Institute (AISI) specification since 2004. The strength of flexural members unsymmetric about the bending axis presents some challenges related to post-buckling stress redistribution, which are not fully addressed in DSM today. This paper introduces generalized modifications to the DSM strength curves to improve strength prediction for these cases. Simple adjustments for stress redistribution due to both yielding and buckling are introduced and validated against a variety of section types from various published test and simulation results. An alternate solution is also developed utilizing a novel form of the strength equation which incorporates inelastic reserve strength. Both methods provide improvement to strength predictions suitable for consideration in design specifications.
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