ACI Regerence

[FiniteElemet]

I have this 48 ft diameter circular slab 24" thick. Slab will support liquid retained tank and sit concrete columns. I ran my analysis and have plate moments and plate shear values. I have modeled this slab as plates. However, if I want to verify whether concrete beams are required, which ACI check shall I look into?

 

[JedClampett]

Beams are a matter of designer's choice in this case. The code is not going to dictate. If you want to make your slab thick enough to carry the shears and moment (and 24 inches is plenty thick enough), you don't need any beams. If you want to make the slab thinner and collect the forces, shears and moments in beams, that's your choice.
I would figure out the column loads, and distribute the loads evenly over the subgrade. Figure out the slab as a continuous beam in each direction and design for the shears and moments. Three's no harm in designing the slab in both directions for the same loads, it's done all the time. Check punching shear and you should be all right.