Structural Behaviour of Cold-Formed Steel of Double C-Lipped Channel Sections Integrated with Concrete Slabs as Composite Beams

Abstract

Cold-formed steel (CFS) construction is widely recognised as an important contributor to sustainability and green construction. Thus, the use of CFS construction is encouraged and had been advanced by innovations in its structural applications. One such innovation that has recently gained popularity is the use of CFS sections in composite construction. The researchers assembled two CFS Clipped channels back to back to construct Ibeam sections for testing. Innovative bracket shear connectors were also developed and inserted between concrete slabs and steel beams in order to provide composite action. The composite beams were drastically stronger and stiffer than non-composite beams. The experimental results were validated theoretically with a high level of correspondence. The proposed composite beams with CFS sections were found to be strong and stiff enough to be used in the construction industry.

State of the art on composite cold‐formed steel flooring systems

“…Wehbe et al (2011) highlighted the importance of composite action on flexural and shear strength of the composite beam which depends upon the number of shear connectors. Hsu et al (2014) and Bamaga et al (2019) demonstrated that the ultimate strength and ductility of the composite section were found to be significantly increased in comparison to non-composite section. More recently, LEAL L.A.A.S and Batista E. M (2020) carried out the full-scale experimental tests on a composite CFS trussed beams and prefabricated concrete slabs, with 7800mm length and 1200mm width, joined together using 0.95mm thin-walled channel as shear connector attached to the top chord of truss with screws.The studies demonstrated that the innovative thin-walled channel connector provide full interaction between the slab and trussed beams, as a result of which load-carrying capacity of the composite beam was significantly enhanced.…”

State of the art on composite cold‐formed steel flooring systems

“…Wehbe et al [21] highlighted the importance of composite action on the flexural and shear strength of the composite beam, which depends on the number of shear connectors. Hsu et al [17] and Bamaga et al [22] demonstrated that the ultimate strength and ductility of the composite section were found to be significantly increased in comparison to non-composite sections. More recently, Leal and Batista [23] carried out full-scale experimental tests on composite CFS trussed beams and prefabricated concrete slabs 7800 mm long × 1200 mm wide and joined together using a 0.95 mm thin-walled channel as a shear connector attached to the top chord of the truss with screws.…”

“…However, Irwan et al [19] pointed out that if the failure of the specimen is concrete-related, CFS thickness does not have significant influence on the ultimate capacity. More recently, in the experimental investigations conducted by Bamaga et al [22], it was demonstrated that cold-formed steel (CFS) with a thickness of 2.3 mm exhibited a 16.7 % greater ultimate moment capacity than a 2.0 mm thick CFS section with the same shear connectors.…”

“…They found that the design methods are able to predict ultimate strength and deflection after comparison with experimental results. Bamaga et al [22] used interpolation and stress block methods for their theoretical analysis of composite beams. The calculations for the stress block method were based on British Standard BS5950 [27].…”

Moment capacity of connection with the additional top and seat angles to slab and column panel of cold-formed steel section

“…The other study about composite slabs was conducted by Bamaga et al [21]. The composite beam is variated in the type of shear connector and beam thickness.…”