Abstract
A simple calculation model is proposed for prediction of the shear resistance of prestressed hollow-core (PHC) slabs supported on beams. A simplified principal stress criterion for the web shear failure is introduced. The criterion is based on three stress components. The vertical shear stress τzy and the axial stress σy are calculated as for slabs supported on nonflexible bearings. The transverse shear stress τzx is calculated applying beam theory to a composite beam comprising the beam, joint concrete, a section of the slabs, and the optional topping. The width of the section is an experimental parameter that takes into account the degree of composite interaction between the slabs and the beam. It is assumed to be proportional to the span of the beam. Also presented are the modifications needed when the beams are continuous, the floor is covered with reinforced concrete topping, or the ends of the hollow cores are filled with concrete.
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