Composite connections between CFS beams and plywood panels for flooring systems: Testing and analysis

Karki, D; Al-Hunaity, S; Far, H; Saleh, A

Composite connections between CFS beams and plywood panels for flooring systems: Testing and analysis

Karki, D Al-Hunaity, S Far, H

Saleh, A

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Publisher:: ELSEVIER SCIENCE INC
Publication Type:: Journal Article
Citation:: Structures, 2022, 40, pp. 771-785
Issue Date:: 2022-06-01

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Field	Value	Language
dc.contributor.author	Karki, D
dc.contributor.author	Al-Hunaity, S
dc.contributor.author	Far, H https://orcid.org/0000-0003-3480-6582
dc.contributor.author	Saleh, A https://orcid.org/0000-0002-2922-9701
dc.date.accessioned	2023-01-12T03:53:14Z
dc.date.available	2023-01-12T03:53:14Z
dc.date.issued	2022-06-01
dc.identifier.citation	Structures, 2022, 40, pp. 771-785
dc.identifier.issn	2352-0124
dc.identifier.issn	2352-0124
dc.identifier.uri	http://hdl.handle.net/10453/164880
dc.description.abstract	A composite floor consisting of cold-formed steel (CFS) beams connected to structural plywood panels is a sustainable and economical alternative to concrete only floors or the traditional floor systems supported by solid lumber joists. The structural performance of the composite CFS-plywood floor depends on the strength and stiffness properties of the shear connection. This study presents an experimental investigation into the load-slip behaviour of connections between CFS and plywood panels constructed with self-drilling screws, coach screws, and nut and bolt. The influence of structural adhesives at the shear interface alongside fasteners was also investigated. The stiffness, ductility and load-carrying capacity of the eight different types of connections were evaluated through a series of push-out tests. Nut and bolt connections were demonstrated to be the best choice amongst the shear connectors, followed by self-drilling screws; however, the size of the nuts and bolts should be determined based on the crushing strength of the timber itself. Connection with coach screws was less stiff and relatively less ductile than other tested shear connections. Composite connections with fasteners along with adhesives demonstrated higher stiffness and load-capacity than the fastener alone. Furthermore, a simple analytical expression for the load-slip response of the connections is proposed based on the Foschi formula, which showed a good correlation with test results. Based on the observations in this study, self-drilling screws and M8 nuts and bolts are recommended as shear connectors for lightweight cold-formed steel and timber flooring systems.
dc.language	English
dc.publisher	ELSEVIER SCIENCE INC
dc.relation.ispartof	Structures
dc.relation.isbasedon	10.1016/j.istruc.2022.04.064
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.title	Composite connections between CFS beams and plywood panels for flooring systems: Testing and analysis
dc.type	Journal Article
utslib.citation.volume	40
utslib.for	0905 Civil Engineering
utslib.for	1202 Building
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2023-06-01T00:00:00+1000Z
dc.date.updated	2023-01-12T03:51:52Z
pubs.publication-status	Published
pubs.volume	40

Abstract:

A composite floor consisting of cold-formed steel (CFS) beams connected to structural plywood panels is a sustainable and economical alternative to concrete only floors or the traditional floor systems supported by solid lumber joists. The structural performance of the composite CFS-plywood floor depends on the strength and stiffness properties of the shear connection. This study presents an experimental investigation into the load-slip behaviour of connections between CFS and plywood panels constructed with self-drilling screws, coach screws, and nut and bolt. The influence of structural adhesives at the shear interface alongside fasteners was also investigated. The stiffness, ductility and load-carrying capacity of the eight different types of connections were evaluated through a series of push-out tests. Nut and bolt connections were demonstrated to be the best choice amongst the shear connectors, followed by self-drilling screws; however, the size of the nuts and bolts should be determined based on the crushing strength of the timber itself. Connection with coach screws was less stiff and relatively less ductile than other tested shear connections. Composite connections with fasteners along with adhesives demonstrated higher stiffness and load-capacity than the fastener alone. Furthermore, a simple analytical expression for the load-slip response of the connections is proposed based on the Foschi formula, which showed a good correlation with test results. Based on the observations in this study, self-drilling screws and M8 nuts and bolts are recommended as shear connectors for lightweight cold-formed steel and timber flooring systems.

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http://hdl.handle.net/10453/164880