FAQ 003520 EN

Helpful Questions & Answers

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What value of the punching shear force VEd is considered for result combinations in RF‑PUNCH Pro?

Answer

In the recurrent situation of a slab with the upper and lower pillars located at one point, the axial compression actions cancel each other out the punching effects in the reinforced concrete plate. As a result, their difference will only be considered as the determined punching shear force (Image 01). 1). The punching direction depends on which side of the slab is the pillar with the greatest axial action.

However, for the internal actions of the result combination (envelope), it is pnly possible to obtain the difference of the axial actions of the pillars if they belong to the same case or load combination. In the punching shear design of a result combination in RF‑PUNCH Pro, two extreme cases are then considered on the safe side:
  1. Design punching shear force equal to the difference between the maximum axial action of the upper pillar minus the minimum axial action of the lower pillar (Image 02);
  2. Design punching shear force equal to the difference between the maximum axial action of the lower pillar minus the minimum axial action of the upper pillar (Image 03).
If it is not strictly necessary to perform the punching shear design of a result combination (as in the case of seismic loads) instead of the result combination, it is also possible to only select the relevant load combinations for the design in RF‑PUNCH Pro.

Keywords

Punching through Shear Punching shear Punching shear design Punching shear force

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  • Updated 5 April 2021

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RF-PUNCH Pro 5.xx

Add-on Module

Punching shear design of foundations and slabs with nodal and line supports

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