This paper presents a formulation for distortional buckling stress (σdist) in cold-formed steel lipped U section columns, with simply supported end conditions and free warping. This formulation is based on an adjusted model from an artificial neural network (ANN), whose data was provided by a program based on the Finite Strip Method (FSM). The results show the viability of the obtained equation for determining σdist on a columns made with the analyzed sections.
Distortional buckling; neural network; elastic stability
