Cross-sectional optimization of cold-formed steel channels to Eurocode 3

Weixin Ma, Jurgen Becque, Iman Hajirasouliha, Jun Ye

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Cold-formed steel structural systems are widely used in modern construction. However, identifying optimal cross section geometries for cold-formed steel elements is a complex problem, since the strength of these members is controlled by combinations of local, distortional, and global buckling. This paper presents a procedure to obtain optimized steel channel cross-sections for use in compression or bending. A simple lipped C-shape is taken as a starting point, but the optimization process allows for the addition of double-fold (return) lips, inclined lips and triangular web stiffeners. The cross-sections are optimized with respect to their structural capacity, determined according to the relevant Eurocode (EN1993-1-3), using genetic algorithms. All plate slenderness limit values and all limits on the relative dimensions of the cross-sectional components, set by the Eurocode, are thereby taken into account as constraints on the optimization problem. The optimization for compression is carried out for different column lengths and includes the effects of the shift of the effective centroid induced by local buckling. Detailed finite element models are used to confirm the relative gains in capacity obtained through the optimization process.
Original languageUndefined/Unknown
Pages (from-to)641-651
Number of pages11
JournalEngineering Structures
Volume101
Early online date13 Aug 2015
DOIs
Publication statusPublished - 15 Oct 2015

Cite this