What type of mesh setting did you used to get the results of solid model? I have the same support condition and loading but the model is in concrete instead and I am getting stress increase every time I reduce the mesh size. That's strange!
First, I had a 3m mesh, I got 16.57 MPa, which is quite close to the value you are getting.
Second, I reduce mesh size to 1m, I am getting 18.29 MPa.
Then when I tried 0.5m mesh, I am getting 19.94 MPa.
It keeps incresing as the mesh size decrease.
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