STAAD.Pro V8i Concrete Slab & Grade Beam Design

I am currently designing a deck slab, supported on grade beams (pile caps), on piles. I have created my beams, set the properties, and put a plate on top to act as the deck. My supports are the locations of the piles. I am having trouble obtaining the max moments and shears of the plate and beams from the moving loads ive generated (based on AASHTO HL-93 design truck requirements)

I created new nodes at the bottom of the beams for the supports. When I did that, my analysis doesn't come up with any reactions. However, if the supports are on the same nodes as the deck, I get reactions. Anyone have any advice on how to correct this?

STAAD file attached. Slab Design 2 test supports.std