Concrete design GZT verifications for flat slab

Product Support
, ,
1

grafik
I am in the process of designing a flat slab in a reinforced concrete skeleton structure. I have inserted the required reinforcement that RFEM6 specifies after the design and recalculated. The verifications are still not met.
I have already increased the slab thickness to 40 cm but cannot increase it further.
I have also set the bar spacing in the surface reinforcement to be determined automatically.
I am not quite sure what I can do to satisfy the ultimate limit state (GZT) verifications.

3

Hi ha123,

Thank you for your message!

To analyze the problem more precisely, the model file would be very helpful:

:right_arrow: Click on File → Save As and choose the following settings to reduce the file size:
image

:right_arrow: Then upload the file here (e.g., *.rf6, *.rs9) – this way the community can also contribute to the solution.

:owl: Don't want to share the file publicly? No problem – send it to me via direct message: click on my profile picture or my username → Message.

Best regards
Stefan Hoffmann

5

Hi ha123,

Thank you very much for your model! :blush:

As far as I can judge, shear force problems exclusively occur at the relevant points, which are caused by punching shear.

We plan to integrate the punching shear verifications directly into the surface results in the future. Currently, however, you have to perform these verifications manually and then compare them.

  • If your punching shear verifications at these points are fulfilled, you can ignore the displayed error messages there, as they are covered by the successful verifications.

image

If you have any questions or need support, feel free to contact me! :blush:

Best regards
Stefan Hoffmann

7

Thank you for the response.
What is meant by manually performing the punching shear checks? Do you mean that one should calculate the punching shear check themselves (without RFEM)? Or can I do this with RFEM using nodes with punching shear?

9

Hallo ha123, derzeit besteht keine Rückkopplung zwischen den Flächenergebnissen und dem Durchstanznachweis.

Wenn du also für Flächen in typischen Durchstanzbereichen (Innenstützen, Randstützen, Eckstützen, Wandenden oder Wandecken) eine Schubbewehrung benötigst, kannst du diese vernachlässigen.

ABER du musst dafür dort einen Durchstanznachweis durchführen. Nach erfolgreichem Durchstanznachweis beträgt die erforderliche Decken-Schubbewehrung im Bereich des kritischen oder äußersten Querschnitts = 0.

Ein solcher Zusammenhang zwischen Knoten- und Flächenergebnissen fehlt derzeit noch, ist aber bereits in Planung.

Viele GrĂĽĂźe, Richard

1 Like