Behaviour of cold-formed steel-concrete composite columns under axial compression: Experimental and numerical study

Concrete filled cold-formed steel-concrete composite columns exhibit improved strength and ductility characteristics due to its ability resist inward buckling as well delay the outward buckling. Though concrete infill prevents buckling, still limits steel section from reaching yield strength. From past studies, it is observed that introducing of web stiffeners in cross-section may improve resistance. The present study focuses on assessing effect longitudinal behaviour square steel–concrete for various slenderness range (0.01 0.4) through experimental numerical studies. Conventionally, integrity hollow tube cross sections ensured by welding or rolling process during manufacturing. Welding cannot be adopted thin-walled cold formed since lead higher degree imperfection. In this study, desired were flat sheet overlapped using self-tapping screws. An intensive analysis was carried out varying stiffener angle 90°, 120°, 141° curves plain profiled presented. It concluded axial compressive stiffened almost equal, attributed inability reach maximum stress concentration at stiffeners’ edges. reduction factor showed values range, indicating positive stiffeners.