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Figure 01 - Number of reinforcement directions

Figure 02 - Design internal forces

Figure 03 - Rated Notes

Figure 04 - calculation details

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FAQ 002403 EN-US 02/13/2019

Markus Baumgärtel Add-on Modules EC2 for RFEM RF-CONCRETE

In RF-CONCRETE areas, I get some things unacceptable. Note 5 is displayed: "Permissible concrete compressive stress in the direction of the concrete strut exceeded."

Answer

RF-CONCRETE Surfaces gives an impermeability to some points in screen 2.1 because the concrete compressive stress is too high there (see Fig. 01). In this screen, you can also use the [Info] button to check the design details for the result line selected in the table above. In a new window, the values show that the absorbable membrane force is smaller than the rated diaphragm force in the direction of the strut (see Fig. 02).

The program outputs a corresponding Unmissbarkeitsmeldung on all finite elements with too large concrete compressive stresses.

The theoretical background to this proof can be found in the manual on RF-BETON surfaces, among others. You can download it from the literature link below or call it with the module open by pressing the [F1] key.

To counteract the unacceptability, the following procedure can be followed

The unacceptability can be caused by singularities: LINK KNOWLEDGE BASE
As soon as it is not a pure plate, the cutting size optimization can be the cause. This should be deactivated with shells and panes (picture 3).
It may be possible to add a third reinforcement right (Fig. 4).
The concrete quality can be increased
The surface thickness can be increased