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This paper reports an ongoing investigation intended to assess the performance of the Direct Strength Method (DSM) to estimate the ultimate strength of lipped channel columns affected by local-plate/distortional mode interaction. First, the DSM approaches to safety check columns against local-plate and distortional failures are briefly reviewed, with special attention devoted to a recently proposed extension that takes into account the above buckling mode interaction. Next, one presents and discusses the results of a parametric study, carried out by means of the code ABAQUS and involving the evaluation of the “exact” ultimate loads of 63 lipped channel columns with various geometries, all exhibiting local-plate/distortional interaction. Then, these ultimate strength data are compared with the estimates provided by the available DSM formulae and, on the basis of this comparison, one identifies several features that a DSM approach successfully accounting for local-plate/distortional interaction must incorporate.

DIRECT STRENGTH PREDICTION OF LIPPED CHANNEL COLUMNS EXPERIENCING LOCAL-PLATE/DISTORTIONAL INTERACTION