Answer:
When modeling a structure, you should avoid areas with double stiffnesses. If you model a downstand beam and a wall at the same location, these elements split the load application. The disadvantage of separating the members on the wall perimeter is that singularities occur at this location. Moreover, the area of the load application from the rib to the wall is at the ceiling height.
Thus, there is no ideal solution in this combined modeling from members and surfaces.
In the case of small models, it would be possible to model the downstand beams and carry out the design by means of result beams.
