I am working on a structure that has a flooring system of 3/4" concrete board spanning between cold-form metal joists at 16" O.C. The joists span up to 20' between wide-flange moment and braced frames. In an effort to simplify the modeling for this multi-story, large structure that is changing through design, I have omitted the joists and spanned the floor in the direction of the joists. My problem is that the floor system is being analyzed as semi-rigid, and the out of plane (vertical) deflections for lateral wind and seismic loads have been very large, 25" - 30". One solution is to model the joists as lateral members, but this will be very time consuming. Is it possible to make this deflection more realistic? I looked into the "Story Diaphragm" option in RAM Frame that includes out of plan stiffness for semi-rigid diaphragms with one-way decks for lateral and gravity load cases, and while this creates the result I expected, I am not sure what the program is doing since the span is still 20' and there are no gravity members joists that I would expect to be able to improve the results to 1/2" of vertical movement. A step that I have considered is using stiffness modifiers to increase the out of plan stiffness, but I am not sure that will lead to the desired outcome and how that may affect other results.