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Prestressed hollow core slabs

Reduced shear resistance on flexible supports

→ 1 Two-span full-scale test setup to determine the shear resistance (left) and FE-model of the floor system with flexible supports under consideration of symmetry (right)

→ 2 Relative shear
resistance V_Rd,ct,bw/V_Rd,ct on flexible supports (_bw) for slab type VMM-L 32 with two slab spans L_sl and variable beam deformation L_b/u according to the new model and the Finish code CCD18

In structural engineering ceilings affect both the building technique and the economic construction. Using precast prestressed hollow core slabs meets the demands of modern design and construction to a high extent. However, the shear resistance of hollow core slabs is reduced if the slabs are bedded on slender beams or girders instead of rigid walls. According to investigations in Finland stresses in transverse direction of the slabs due to flexible supports may lead to a decrease in shear resistance of up to 60%. The reduction in shear resistance depends on the composite action between the...

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