Built-up nested cold-formed steel compression members subject to local or distortional buckling

The current cold-formed steel (CFS) design standards have not yet provided adequate methods for built-up nested CFS channel compression members, which may fail by either local or distortional buckling, despite several research studies in recent times. These proposed improved DSM based that led to capacity predictions with varying accuracy. Besides, there were some contradicting observations regarding the effects of screw connections on their behaviour and capacities. Hence, this study investigated members. It included experimental tests short single members failing local-distortional interaction respectively, development validation suitable finite element models finally a parametric (1) show buckling is critical failure mode (2) examine characteristics spacing Importantly, accuracy currently available equations recently published papers was simple method recommended. This paper presents details study, its results findings.