Slabs without shear reinforcement usually exhibit brittle shear failure under a central force andan unbalanced moment that transferred between the column and the slab. Conventional design methodsconsider potential punching failures in the vicinity of concentrated loads. Nominal shear stresses at welldefinedcritical sections are limited to guard against such failure modes. With the extensive use of thicktwo-way plates made of high strength concrete for offshore structures and nuclear containmentstructures, different design codes must provide minimum shear reinforcement requirements for such thickplates and two-way concrete slabs. In this paper new models were developed to calculate minimum shearreinforcement for plates and two-way slabs. The proposed models account for member size effectthrough fracture mechanics concepts.
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