Finite element modelling of composite cold-formed steel flooring systems. (1st March 2018)

• Record Type: Journal Article
• Authors: Kyvelou, Pinelopi; Gardner, Leroy; Nethercot, David A.
• Is Part Of: Engineering structures. Volume 158(2018)
• Page Start: 28
• Page End: 42
• Publication Date: 2018-03-01
• Subjects: Cold-formed steel -- Composite action -- Finite element modelling -- Numerical modelling -- Partial shear connection -- Wood-based particle boards; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2017.12.024
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Finite element modelling of composite cold-formed steel – wood-based flooring systems. Validation of developed finite element models against physical tests reported in the literature. Parametric studies examining the degree of composite action mobilised within the systems. Investigation of gains in terms of bending capacity and flexural stiffness by enhancing the employed shear connection. Abstract: The findings from a numerical investigation into the degree of composite action that may be mobilised within floor systems comprising cold-formed steel joists and wood-based particle boards are presented herein. Finite element models have been developed, simulating all the components of the examined systems, as well as the interaction between them. The models include initial geometric imperfections, the load-slip response of the fasteners employed to achieve the shear connection as well as both geometric and material nonlinearities. The developed models were first validated against 12 physical tests reported in the literature, which showed them to be capable of accurately capturing the load-deformation curves and failure modes exhibited by the tested specimens. Parametric studies were then performed to examine the influence of key parameters on the structural behaviour of these systems, including the depth and thickness of the cold-formed steel section, as well as the spacing of the employed fasteners; in total, about 100 systems have been examined. Significant benefits in terms of structural response have been identified from the presented numerical study as a result of the mobilisation of composite action; for the systems investigated, which were of typical, practical proportions, up to 140% increases in moment capacity and 40% increases in stiffness were found. The presented research reveals the substantial gains in structural performance and the influence of the key governing parameters for this novel form of composite construction.