Hi Vitor,
The problem is most likely due to the application of the moments in your model.
A solid element has only 3 translational and no rotational dofs, In FEA we then need to work around the above fact.
So we create a rigid element connected to the face of the beam where the moment needs to be
applied, with all its dependant nodes on the solid face an(HyperMesh calculates the independent node by itself)
Please also go through - HW BestPractice Webinars (engl.): Using RBEs and MPCs in RADIOSS using the link below.
http://www.altairhyperworks.de/ResLibSearchResult.aspx?file_id=905&keywords=HW%20BestPractice%20Webinars%20(engl.)#2027
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