Example of 8-node shell elements representing a simply supported beam. The beam can represented in two different orientations. Both are equivalent if the plate thickness is the same as the length in this case. The boundary conditions in the upper beam actually depend on how the beam is physically supported (whether the restraint is underneath the beam or in the middle or at the top). In this example, I have placed the support in the middle. Restraints have been added in the X and Y directions on one end and in the X direction on the other end.
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