The slab plays an important role in seismic response of reinforced concrete (RC) Structures because it allows to actively distribute the seismic actions among all the resistant primary elements. However, its contribution cannot be relegated to simple rigid diaphragm but its capacity of increasing strength and stiffness in beam-to-column joints must be considered. Although some experimental campaign were performed to prove that the slab contribution in terms of resistance cannot be neglected, the current seismic European code (Eurocode 8) does not provide a proper formulation to estimate the actual contribution of the slab in terms of strength and stiffness on the seismic response of RC buildings. To this scope, in the present work, an experimental campaign on six RC beam-to-column joints with and without floor slab were carried out by performing both monotonic and cyclic tests. The main research goal is the validation through an experimental evidence of the effectiveness of the theoretical formulations proposed in previous works, able to evaluate the deck contribution in the beam-to-column joint resistance. In particular, reference is made to RC joists with upper slab and interlaid tiles monolithically cast with the beams, which is a constructive typology largely spread in the Mediterranean area.
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