The common failure mode of composite steel‐concrete structural elements, such as composite columns, generally occurs due to the relative slipping or separation of the steel sheet and the concrete. This leads to materials overspending and low resistance. In the case of beam‐to‐column joints, the most common solution used in composite construction is introducing a perpendicular gusset plate, which is complex in terms of execution. On the other hand, there is no efficient solution for shear transferring along the whole length of the column to prevent slip under bending. The UPC patent improves very significantly the shear transferring between steel and concrete, enough to achieve the permanent connection in many cases, by means of generating a series of many crown‐shaped breakages produced by punching in the profiling stage, not only in the joints but also in the whole length. When the concrete sets, the said breakages embedded therein have the function of resisting shearing forces generated between both materials. It has been successfully applied to composite slabs and, in terms of composite columns, it is also a disruptive innovation to solve the current shear transfer limitation. Besides, this innovative system is easy to be massively produced avoiding the complexities of the conventional beam‐to‐column joints and reducing the construction costs, especially in high‐rise buildings. The aim of this paper is to present this new technology for connecting steel sheet and concrete in CFST columns.
In this paper the strength of steel deck-concrete composite slabs is studied. Conventional slabs with open and dovetail profiles are studied with different designs, galvanized and stainless steel. Partial connection method (PCM) in Eurocode-4 is permitted for slabs with ductile longitudinal shear behavior. Ductility, as explained in the clause 9.7.3(3), depends on the fact that the failure load exceeds the load corresponding to the slip (0.1 mm) in more than 10%; then the slab is classified as ductile. Apparently, the aim of this criterion is to ensure the slab can undergo further deflections until the whole yielding of the cross-section is achieved, as required hypothesis by the PCM. The aim of this paper is to study the stresses developed at the cross-section of composite slabs with open and dovetail profile, in order to evaluate the yielding degree of the cross-section. Based on the results of this study, it is recommended to exclude open profiles from partial connection method (PCM), even if the slab is classified as ductile through Eurocode definition. Although all studied specimens are classified as ductile according to Eurocode-4 clause 9.7.3(3), the observed stress distribution at cross-section proves that yielding occurs in the slab with re-entrant profile only, whereas slabs with open-rib profiles remain almost elastic until their brittle failure.
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