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Steel and Composite Structures Volume 43, Number 4, May25 2022 (Special Issue) pages 511-522 DOI: https://doi.org/10.12989/scs.2022.43.4.511 |
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Determination of slip modulus of cold-formed steel composite members sheathed with plywood structural panels |
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Dheeraj Karki, Harry Far and Suleiman Al-hunity
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| Abstract | ||
| An experimental investigation to study the behaviour of connections between cold-formed steel (CFS) joist and plywood structural panel is presented in this paper. Material testing on CFS and plywood was carried out to assess their mechanical properties and behaviour. Push-out tests were conducted to determine the slip modulus and failure modes of three different shear connection types. The employed shear connectors in the study were; size 14 (6mm diameter) self-drilling screw, M12 coach screw, and M12 nut and bolt. The effective bending stiffness of composite cold-formed steel and plywood T-beam assembly is calculated based on the slip modulus values computed from push-out tests. The effective bending stiffness was increased by 25.5%, 18% and 30.2% for self-drilling screw, coach screw, nut and bolt, respectively, over the stiffness of coldformed steel joist alone. This finding suggests the potential to enhance the structural performance of composite cold-formed steel and timber flooring system by mobilisation of composite action present between timber sheathing and CFS joist. | ||
| Key Words | ||
| cold-formed steel joists; structural plywood; material tests; push-out tests; load-slip behaviour; slip modulus | ||
| Address | ||
| Dheeraj Karki, Harry Far and Suleiman Al-hunity:School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney (UTS), Building 11, Level 11, Broadway, Ultimo, NSW 2007, Australia | ||