Reference : Different load bearing mechanisms in headed stud shear connectors for composite beams...
Scientific journals : Article
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/10993/40641
Different load bearing mechanisms in headed stud shear connectors for composite beams with profiled steel sheeting
English
Vigneri, Valentino mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Odenbreit, Christoph mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Lam, Dennis [University of Bradford > Department of Civil and Structural Engineering]
Aug-2019
Steel Construction
Wiley-VCH Verlag
12
3
184-190
Yes
International
1867-0520
1867-0539
[en] shear connector with profiled sheeting ; numerical model ; mechanical model ; resistance mechanisms ; Composite construction ; Analysis and design ; Verbundbau ; Berechnungs- und Bemessungsverfahren
[en] The current design rules of EN 1994-1-1 covering headed stud shear connectors for composite beams with profiled sheeting lead, in some cases, to an overestimation of the load bearing capacity. Owing to their empirical nature, these equations are not able to capture the real behaviour of the connector. Therefore, 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 proposed, the concrete rib is modelled as a system of diagonal struts in combination with the stud in bending. It was observed that at 1-4 mm slip, a 'strut and beam' mechanism prevails, where the resistance of the connector depends on the activation of the plastic hinges in the stud and on the capacity of the diagonal strut in front of it. By increasing the slip (approx. 4-10 mm), the surrounding concrete gradually crushes, while the tensile stresses at the edge of the rib reach the tensile strength of the material. Because of this loss of rotational stiffness, the bending moment in the stud decreases and the upper plastic hinge gradually moves towards the slab. At higher displacements (approx. 20-40 mm), high tensile forces develop in the stud due to non-linear geometric effects and the load is carried through a 'strut and tie' resistance mechanism, provided that the embedment of the stud is sufficient to prevent the rotation of the rib. As the slip increases further, failure occurs either in the form of concrete pull-out or stud rupture.
http://hdl.handle.net/10993/40641
10.1002/stco.201900019
Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019

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