Abstract

Parametric optimization problem for single edge fold size in cold-formed structural members subjected to central compression has been considered by the paper. Determination the load-bearing capacity of the cold-formed structural members has been performed using the geometrical properties calculated based on the constructed “effective” (reduced) cross-sections taking into account local buckling effects in the section as well as distortional buckling effects.
 Single edge fold size in cold-formed C-profile has been considered as design variable. Linear convolution of criteria, namely minimization criterion of design area of stiffener cross-section and maximization criterion effective area of stiffener cross-section which defines it reduced load-bearing capacity due to flexural buckling has been used as optimization criterion. The parametric optimization problem has been solved using the method of objective function gradient projection onto the active constraints surface with simultaneous correction of the constraints violations. In order to realize the formulated optimization problem, software OptCAD intended to solve parametric optimization problems for steel structural systems has been used.
 Optimization results of the single edge folds for the cold-formed С-profiles manufactured by «Blachy Pruszyński» company, «BF FACTORY» company as well as «STEELCO» company have been presented by the paper. The results of the performed investigation can be used as recommendations for companies-manufacturers of the cold-formed profiles, as well as a guide for creation the national assortment base of the effective cold-formed profiles promoting wider implementation of cold-formed steel structures in building practice.

Highlights

  • The use of cold-formed thin-walled profiles was limited to cases where reducing the weight of the structure was a priority, such as in the aviation or automotive industries

  • Various structural systems made from thin-walled cold-formed profiles, which are widely used in the construction industry, are actively imported to the Ukrainian market of steel structures

  • The reduced area of the stiffener design section determined the reduced load-bearing capacity of the stiffener due to flexural buckling is calculated depending on distortional buckling factor d as follow: As,red d As

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Summary

Introduction

The use of cold-formed thin-walled profiles was limited to cases where reducing the weight of the structure was a priority, such as in the aviation or automotive industries. The reduced area of the stiffener (single edge fold) design section determined the reduced load-bearing capacity of the stiffener due to flexural buckling is calculated depending on distortional buckling factor d as follow: As,red d As. The reduced load-bearing capacity of the stiffener due to flexural buckling is taken into account by reduction of the thickness for the stiffener design section as presented below: tred t As,red As. In the paper [6] load-bearing capacity region in “axial force – bending moment” coordinates for a doubly symmetrical cross-section of the thin-walled cold-formed structural members has been constructed according to the requirements of the design code [1, 2]. In order to realize the formulated optimization problem, software OptCAD intended to solve parametric optimization problems for steel structural systems has been used [5, 6]

Results and discussion
Conclusion
DSTU-N B EN 1993-1-5:2012 EuroCode 3

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