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Direct Strength Method for Design of Cold-Formed Steel Structural Members

Ahmad Swalih, Jikhil Joseph

Abstract


Direct Strength Method (DSM) is a relatively new design method for cold-formed steel (CFS) structural members. Accurate member elastic stability is the fundamental idea behind the Direct Strength Method, i.e., if all the instabilities for the gross section and the moment or load that causes the section to yield are determined, then the strength can be directly determined. The buckling modes considered in DSM are local buckling, distortional buckling and global buckling. The critical elastic buckling loads/moments for all three buckling modes are required to design CFS structural members using DSM. They can either be obtained from a finite strip analysis of the section or by means of analytical solutions. The main advantage of DSM is that it requires less effort than Effective Width Method for designing CFS members with optimized sections. However, DSM is still under development and further research is needed to extend its applicability.

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References


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