Optimization cross-sectional dimensions for cold-formed steel lipped channel columns

Parametric optimization problem of cross-sectional sizes for cold-formed C-profiles subjected to central compression has been considered by the paper. formulated as follow: define optimum taking into account post-buckling behavior and structural requirements when stripe width thickness well type profile are constant defined designer.
 Criterion load-bearing capacity maximization assumed purpose function. The latter presented in form linear convolution resistance flexural, torsional torsional-flexural buckling thin-walled member determined according EN 1993-1-3:2012 1993-1-5:2012. Searching performed a possibility post-critical based on local web flanges and/or distortional edge fold stiffeners.
 Formulated parametric solved using software OptCAD. Update gradient method function projection active constraints hyperplanes with simultaneous liquidations residuals implemented software.
 As results have obtained. With same profiles higher level under comparing proposed Ukrainian manufacturers. Besides, C-profile is determinative all decisions.