AN OVERVIEW OF LOCAL AND DISTORTIONAL BUCKLING IN COLD- FORMED U LIPPED SECTIONS IN FLEXURE
Palavras-chave:
Cold-formed steel design, Direct strength method, Finite element method, Finite strip method, Local and distortional bucklingResumo
The design of cold-formed steel elements in flexure can be easily performed by the Direct
Strength Method – a simplified alternative based on experimental data, in which the critical buckling
bending moments are needed to assess the ultimate resistance of steel elements. Whereas numerous
theoretical models are found in the literature to appraise local and distortional buckling loads, they’re
usually based on simplifications and don’t provide their exact values so that different formulations
conduct to different results. In this sense, through analyses based on the Finite Element and the Finite
Strip Methods, this work seeks to numerically obtain local and distortional buckling loads of a cold-
formed U stiffened section bent about both principal axes and compare the results with those provided
by the theoretical models. While numerical results have shown good agreement between them, with
deviations less than 5% on mean, the analytical ones seemed to be conservative but not accurate when
compared to the firsts, with deviations varying from 7% up-to 60%.
