Abstract
Composite floor systems, when compared to reinforced concrete slabs, are a more cost-effective structural solution. The overall behaviour of these composite members depends on the shear connection between steel and the concrete encasement. The pre-cast composite flooring system with hollow-core section presents an efficient and useful solution that helps to reduce the flooring height. This paper reports the results of composite connection push-out and the associated composite beams full-scale tests. The system was composed of a partially encased asymmetric steel beam, and the shear transfer mechanism was established through an innovative shear connection by chemical bonding, friction, and dowel action (by transversal reinforcing bars passing through the web's holes). The tests results indicated that a rigid connection was produced by the chemical bonding and friction of the embedded flange profile in the concrete slab, as well as the composite beam's ability to develop its plastic bending moment capacity. The proposed analytical model provides an efficient way for analysing and designing a composite beam with encased compression flanges. Based on the results from the ultimate flexural resistance analytically obtained, a sensitivity study was also developed to evaluate the most competitive cases in terms of structural efficiency.
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