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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 floor with the upper and lower pillars are located at one point, the axial compression actions cancel each other out the punching effects in the reinforced concrete plate. As a result, only their difference (fig. 1). The punching direction depends on which side of the floor insists the pillar with the greatest axial action.

However, for the internal actions of a combination of results (envelope), it is possible to obtain the difference of the axial actions of the pillars only if they come from the same case or from the same load combination. In the shear-punching verification of a combination of results in RF-PUNCH Pro then two extreme cases are considered to the advantage of safety:
  1. design shear-punching force equal to the difference between the maximum axial action of the upper pillar minus the minimum axial action of the lower pillar (fig.2);
  2. design shear-punching force equal to the difference between the maximum axial action of the lower pillar less the minimum axial action of the upper pillar (fig.3).
Alternatively, if it is not strictly necessary to perform the shear-punching verification of a combination of results (as is the case for seismic loads), instead of the combination of results it is possible to select for the project in RF-PUNCH Pro only the load combinations contained in it.

Keywords

Punching shear Cut Cutting-punching Check-punching verification Cutting-punching force

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RFEM Concrete Structures
RF-PUNCH Pro 5.xx

Add-on Module

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

Price of First License
760.00 USD