Experimental and numerical investigation on cold-formed steel built-up section pin-ended columns

The thorough test programme and numerical simulation were conducted to examine the buckling behaviour loading capacity of cold-formed steel (CFS) built-up section members subjected axial compression. In programme, folded-flange channels grades G500 G550 designed assemble novel compressive members. Two types sectional profiles formed by composing with self-tapping screws. A total twenty-two specimens member lengths varied from 300 1500 mm compressively loaded under pin-ended supports. initial geometric imperfection measurements, rig arrangement, procedure results fully reported. simulation, extensive parametric study incorporating 224 CFS columns was performed further generate data covering a broad range configurations parameters. After that, comparisons capacities obtained experiments nominal strengths calculated on basis direct strength method (DSM) as stipulated in Australian/New Zealand Standard North American Specification assess applicability current design rules for manifest that codified DSM equations are generally conservative fairly scattered predict resistances newly columns. modifications thus proposed this open closed It is found modified formulae reliably provide overall precise less predictions.