I have a flat plate, PT building that we have designed using concept and has already been constructed. Now the owner wants to change the residential penthouse to a nightclub which of course the floor is not designed for. I need to pull out design values…

I am modeling a 2 way concrete transfer slab (4 stories above) in RAM Concept. The columns are modeled as compressible, roller at far end. When I look at the moment diagrams in the slab there is a large jump in the moments as it crosses the column…