Answer:
In the case of significant deviations, the problem may be caused by the applied bending theory (Mindlin or Kirchhoff).
For this, see the FAQ about Mindlin Kirchhof:
Differences Between Mindlin and Kirchhoff Bending Theory
When evaluating the support reactions of a plate supported by line supports, I noticed that the support reaction pz' does not correspond to the shear force and deviates significantly. Why?
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