Abstract
Increasingly, floors are made today from a steel girder connected to a concrete slab or a composite slab with ribbed decking. Mixed operation indeed makes it possible to optimize the structural exploitation of these two materials. In many applications, especially 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 for the passage of pipes and ducts. Serviceability checks including flexural deflections under transverse loading are of high importance in the design, especially in floor systems and pedestrian bridges where live loads are present. In this paper, an analytical model for calculating deflections due to concentrated or uniformly applied transverse loads have been developed. The additional deflection due to the effects of vertical shearing at the opening is included in the analysis. The analytical results presented are verified against existing proposals and numerical solutions obtained using the Cast3m software.
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