Reference : Different load‐bearing mechanisms in headed stud shear connections in composite beams...

	Document type :	Scientific congresses, symposiums and conference proceedings : Paper published in a journal
	Discipline(s) :	Engineering, computing & technology : Civil engineering
	To cite this reference:	http://hdl.handle.net/10993/40640

Title :	Different load‐bearing mechanisms in headed stud shear connections in composite beams with profiled steel sheeting
Language :	English
Author, co-author :	Vigneri, Valentino [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
	Odenbreit, Christoph [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
	Lam, Dennis [University of Bradford > Department of Civil and Structural Engineering]
Publication date :	Sep-2019
Journal title :	ce/papers
Publisher :	Wilhelm Ernst und Sohn
Volume :	3
Issue/season :	3-4
Special issue title :	Proceedings of Nordic Steel 2019
Pages :	231-236
Peer reviewed :	Yes
Audience :	International
ISSN :	2509-7075
City :	Berlin
Country :	Germany
Event name :	The 14th Nordic Steel Construction Conference
Event date :	from 18-09-2019 to 20-09-2019
Event place (city) :	Copenhagen
Event country :	Denmark
Keywords :	[en] Shear stud ; Shear connector with profiled sheeting ; Mechanical model ; Resistance mechanisms
Abstract :	[en] The current regulations of EN1994-1-1 for headed stud shear connections in composite beams with profiled sheeting lead, for some configurations, to an over-estimation of the load-bearing capacity. Since these design equations are based on empirical considerations, they are not able to capture the real mechanical behaviour of the connector and they do not consider appropriately the influence of the geometry of sheeting on the shear capacity. For this reason, the load-bearing mechanisms of the shear connection are identified in this work with the support of experimental and numerical results. According to the static system presented, the concrete rib is modelled as a system of diagonal struts acting simultaneously in combination with the stud in bending. It is observed that at 2÷4 mm slip, a ?Strut and beam? mechanism prevails where the resistance of the connector depends mostly on the plastic hinges activated in the stud and on the capacity of the diagonal strut in front of it. By increasing the slip (ca. 4÷10 mm), the surrounding concrete progressively crushes while the tensile stresses at the edge of the rib reach the tensile strength of the material. As a consequence of this loss of rotational stiffness, the bending capacity developed in the stud reduces and the upper hinges gradually moves towards the slab. At higher displacements (ca. 20÷40 mm), due to nonlinear geometric effects, high tensile forces develop in the stud and the load is carried through a ?Strut and Tie? resistance mechanism, if the embedment of the stud is sufficient. By further increasing the slip, the whole rib rotates or the failure occurs either for concrete pull-out or stud rupture. This contribution describes the sequence of the activated load-bearing mechanisms in headed stud shear connections with profiled steel sheeting at different displacements.
Permalink :	http://hdl.handle.net/10993/40640
DOI :	10.1002/cepa.1050

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