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Experimental Investigation of Cold-Formed Steel-Timber Board Composite Floor Systems
This paper comprises an experimental investigation into the structural performance of cold formed steel (CFS) and timber board composite floor systems. The tests include a series of small-scale pushout tests and full-scale bending tests carried out using a refined loading system to simulate uniformly distributed constant load. The influence of connection details (screw spacing and adhesives) on floor performance was investigated. The results are then compared to predictions from relevant existing models for composite floor systems. The results of this research demonstrate the significant benefits of considering the composite action of the boards in floor design. Depending on connection detail, an increase in flexural stiffness of up to 40% was observed in the floor system, when compared to designing joists individually.
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[1] R. M. Lawson, R. G. Ogden, R. Pedreschi, and S. O. Popo-Ola, “Developments of cold-formed steel sections in composite applications for residential buildings,” Advances in Structural Engineering, vol. 11 (6), 2008, pp. 651-660.
[2] Committee of European Normalisation (CEN), EN 1994-1-1-2004, Eurocode 4: Design of composite steel and concrete structures, Part 1-1 General Rules and Rules for buildings, Brussels, the Netherlands.
[3] L. Xu, and F.M. Tangorra, “Experimental investigation of lightweight residential floors supported by cold-formed steel C-shape joists,” Journal of Constructional Steel Research, vol. 63 (3), 2007, pp. 422-435.
[4] P. J. Grubb, R. Thepaut, and C. Mettem, “Lightweight steel/timber composite solutions: Information and guidance for new product development,” SCI Publication, SCI ED002, Silwood Park, Ascot, UK, 2003.
[5] C. Loss, and B. Davison, “Innovative composite steel-timber floors with prefabricated modular components,” Engineering Structures, vol. 132, pp. 695-713.
[6] A. Hassanieh, H. R. Valipour, M. A. Bradford, “Experimental and numerical study of steel-timber composite (STC) beams,” Journal of Constructional Steel Research, vol. 122, 2016, pp. 367-378.
[7] P. Kyvelou, L. Gardner, and D. A. Nethercot, “Testing and analysis of composite cold-formed steel and wood-based flooring systems,” Journal of Structural Engineering, vol. 143 (11), 2017, 04017146.
[8] P. Kyvelou, L. Gardner, D. A. Nethercot, “Composite action between cold-formed steel beams and wood-based floorboards,” in the International Journal of Structural Stability and Dynamics, vol.15 (08), 2015, 1540029.
[9] R. M. Lawson, D. Lam, E. S. Aggelopoulos, and S. Nellinger, “Serviceability performance of steel-concrete composite beams,” in Proceedings of the Institution of Civil Engineers on Structures and Buildings, vol. 170 Issue SB2.
[10] A. Hassanieh, H. R. Valipour, and M. A. Bradford, “Experimental and analytical behavior of steel-timber composite connections,” Construction and Building Materials, vol. 118, 2016, pp. 63-75.
[11] B. S. Lakkavalli, and Y. Liu, “Experimental study of composite cold-formed steel C-section floor joists,” Journal of Constructional Steel Research, vol. 62, 2006, pp. 995-1006.
[12] Committee of European Normalisation (CEN), EN 26891, Timber structures – Joints made with mechanical fasteners – General principles for the determination of strength and deformation characteristics. Brussels, the Netherlands, 1991.
[13] European Organisation for Technical Approvals (EOTA), TR 002, Test methods for light composite wood-based beams and columns, Charlottenlund, Denmark, October, 2000.
[14] P. Kyvelou, L. Gardner, D. A. Nethercot, “Design of cold-formed steel flooring systems,” Structures, 2017, pp. 242-252.
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