Experimental and numerical investigation into the behaviour of face-to-face built-up cold-formed steel channel sections under compression

摘要: Abstract Face-to-face built-up cold-formed steel channel sections are becoming increasingly popular for column members in structures; its applications include trusses, space frames and portal frames. In such an arrangement, the independent buckling of is resisted by intermediate fasteners. literature, no research available face-to-face columns. The issue addressed herein. This paper presents results 36 experimental tests, conducted on channel-sections covering a wide range slenderness from stub to slender A nonlinear finite element model then described that shows good agreement with results. includes material non-linearity, initial imperfections modelling Both compared against design strengths calculated accordance American Iron Steel Institute (AISI), Australian New Zealand Standards (AS/NZS) Eurocode (EN 1993-1-3). verified used purposes parametric study comprising 90 models. effect fastener spacing axial strength was investigated. From experiments investigations, it shown AISI & AS/NZS 1993-1-3) generally conservative around 15%, however, can be un-conservative 8% average columns failed through local buckling.