Flat slabs with lattice girders according to
European Technical Assessment

Figure: Filigran

Filigran punching shear reinforcement (FDB) with upper flexural reinforcement placed on top

Figure: Filigran

Concrete Components Supply Industry Innovation Award 2014 for the Filigran punching shear reinforcement

Figure: Filigran

Increase in the punching shear resistance for various reinforcements

Figure: Filigran

Countable bars in the verification of the steel load-bearing capacity according to ETA-13/0521 [2]

Figure: Filigran

Utilization factor and size of the necessary punching shear areas with wall ends according to various approaches

Figure: Filigran

Verification of the maximum punching shear lead resistance in case of fatigue according to equation (6)

Figure: Filigran

Fatigue resistances for various punching shear reinforcements

Figure: Filigran

Maximum distances of the FDB Filigran punching shear reinforcement

Figure: Filigran

The safe manufacture of flat slabs made of precast slabs with lattice girders and in-situ concrete topping requires a tested and cost-effective design concept for the verification of the punching shear points. A European Technical Assessment has been issued for the Filigran punching shear reinforcement; the improved design approaches extend its application.

Flat slabs are manufactured cost-effectively from prefabricated slabs with lattice girders and a cast-in-situ concrete topping.The safe use of these precast slabs with in-situ topping as double-axis stressed slabs has been sufficiently proven through examinations; design rules exist for this [1]. The Filigran punching shear reinforcement was developed to increase the punching shear resistance of these floors (figure 1). The reinforcement, which resembles a lattice girder, is characterized by the fact that the loops on the top chord project and protrude into the layer of the upper flexural...