Lattice girder floor slabs – tested application as a point-supported slab

On the basis of experimental examinations, the load-bearing behavior and dimensioning concept of lattice girder floor slabs as a point-supported slab is illustrated. Flat slabs with FDB II Filigran punching shear reinforcement show an increased punching shear resistance in comparison with other punching shear systems, and they are resilient to geometrical deviations of the precast concrete components from the reference position in the area of punching shear.

To verify the load-bearing capacity of buildings or structural components, the planning engineer uses engineering models. These are secured – in particular in the case of construction with reinforced concrete – by tests with structural components before they can be used in practice with sufficient safety. With flat slabs, experimental examinations of the punching shear resistance are the norm. Moreover, if the ceilings are manufactured from precast slabs with a layer of in-situ concrete, tests on such precast floor slabs are necessary. In this case the planning engineer can rely on the...

Related articles:

Issue 2017-02 Flat slabs and foundations

New punching shear reinforcement systems

The structural design of flat slab systems is usually governed by the punching shear resistance of the slab. To achieve a sufficient punching shear resistance at reasonable slab thickness, shear...

Issue 2017-01 Filigran Trägersysteme

Joints optimized between precast concrete elements in areas of punching shear

Flat slabs are economically manufactured with precast slabs and topped with in-situ concrete. Accurate execution requires detailed planning. In areas of punching shear, the arrangement of the precast...

Issue 2016-02 Experimental investigations, applications and recommendations

“Construction of slab-column-connections in semi-precast slabs”

Semi-precast slabs become more and more important as flat slabs due to the high degree of prefabrication. Their structural design is important in terms of safety owing to the high shear stress and...

Issue 2014-02 Punching shear tests on precast concrete slabs lead to European Technical Approval (ETA)

With projecting loops to peak load –

Flat slabs made as precast reinforced-concrete slabs with lattice girders and an effective in-situ concrete topping prove to be cost-efficient. Nevertheless, such flat slabs – in contrast to line...

Issue 2021-02

Punching shear behavior of steel fiber reinforced flat slabs in combination with punching shear reinforcement

The guideline “Steel Fibre Reinforced Concrete” published by the German Committee for Reinforced Concrete (DAfStb) in 2012 regulates the punching shear design of steel fiber reinforced flat slabs...