Abstract
Abstract Screws are commonly used as connectors in cold-formed steel structures as they can be drilled easily through thin sheet steels, allowing on-site assembly. However, in a connection undergoing shear and bending, while a screw may fail, other screws may be still in the elastic state. Therefore, investigation in the load-deflection response of screw connectors before failure is required for further understanding of complex screwed connections. Experiments and simulation are being carried out at the University of Sydney in order to investigate the behaviour of cold-formed steel connections with screw fasteners in shear. The screw model is built with solid deformable elements containing the screw threads. A plasticity model is applied to the steel sheets to represent different stress states of steel during failure. The model successfully simulates the different behaviour occurring simultaneously in the screwed connection tests: tearing and piling up of the steel sheets, end plate failure, tilting and fracture of the screws.
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