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 reinforcement often cannot be avoided. The upper bound of the punching shear resistance is characterised by a concrete crushing located directly at the column face. To strengthen the highly stressed portion of the slab around the column, pre-cast fibre-reinforced Ultra High Performance Concrete (UHPC) units were installed in the compression zone, replacing the normal strength concrete (NSC). Punching...

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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...

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Issue 2018-02 Punching shear behavior of footings with a varying amount of punching shear reinforcement

Experimental investigations

The punching shear design provisions for footings and ground slabs were revised with the introduction of Eurocode 2 in Germany. In contrast to previous German codes, the location of the control...

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Issue 2019-02 New experimental results on punching shear behavior of flat slabs with varying amount of punching shear reinforcement

Reduction of punching shear reinforcement

With introduction of Eurocode 2 in Germany, the punching shear design provisions for flat slabs were revised. In consequence of limited anchorage conditions of punching shear reinforcement elements in...

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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...

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Issue 2021-01 FILIGRAN TRÄGERSYSTEME

Punching shear reinforcement with increased bond resistance

Flat slabs with lattice girders as semi-precast construction system feature horizontal composite joints between the semi-precast concrete slabs and the in-situ concrete topping. Both the punching...

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