Development of novel shear connectors for cold-formed steel concrete composite beams

Abstract

The usage of cold-formed steel members as a primary structural element has increased drastically, paving the way for developing cold-formed steel-concrete composite members. The shear connectors are key elements to provide the composite action between steel and concrete. The research on suitable shear connectors for cold-formed steel-concrete composite members has been widely investigated. This study evaluates the behavior of three novel shear connectors. The proposed shear connectors were anchored without welding, making them suitable for light gauge sections by reducing the formation of residual stresses and geometrical imperfections. The first two shear connectors (trapezoidal and hexagonal) were anchored using self-tapping screws. The third one, the prefabricated shear connector, was incorporated by adopting suitable modifications in the beam without external connecting arrangements. The behaviour of connectors was assessed by conducting push-out tests as per Eurocode 4. The shear capacity, characteristic slip, initial stiffness, load-slip relationship, ductility, and energy absorption capacity of the connectors were analysed and presented. It is observed that the prefabricated shear connector has recorded the highest shear capacity and energy absorbing capacity among the proposed connectors.