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 hollowcore section presents an efficient and useful solution that helps to reduc the flooring height. This thesis reports the results of full-scale tests in composite beams and the associated composite connection push-out tests. In addition to the tests, a nonlinear Finite Element analysis was conducted to recalculate the experimental results with sufficient precision using a consistent set of parameters. 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.