Abstract
Building floor systems are made from steel girders connected to a concrete slab or a composite slab with ribbed decking. In office buildings with large free span areas, different technical and economic constraints lead to a substantial reduction of the floors thickness, by providing openings in the webs of beams designed to allow the passage of pipes and ducts.The web openings may have a significant effect on the deflection of beams subjected to transverse loading and in many cases, be the paramount parameter in their design.In this paper, an analytical model previously developed for the evaluation of total deflection of composite symmetric cellular beams has been improved, through a better consideration of the flexural stiffness of the beam webs under vertical shear forces. The analytical results presented are compared against other existing proposals in the literature then verified against the numerical solutions obtained using the Cast3m software.
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