Nonlinear behaviour of built-up cold-formed steel section battened columns

摘要: Abstract This paper discusses nonlinear behaviour and design of built-up cold-formed steel section battened columns. The columns were pin-ended consisted two channels placed back-to-back connected using batten plates. Nonlinear 3-D finite element models developed to simulate the structural performance axially loaded material properties flat corner portions channels, initial geometric imperfections, actual geometries boundary conditions carefully considered in models. verified against tests, recently conducted reported by authors, on same form construction. column strengths, failure modes, deformed shapes at failure, load-lateral displacement load-axial strain relationships predicted from analyses compared well test results. In addition, validated used perform an extensive parametric study investigating different parameters affecting comprising slenderness, lengths, cross-section geometries, spacing between plates spacing. Furthermore, strengths with calculated North American Specification, Australian/New Zealand Standard European Code for