Concrete Pan Deck on Pilings in Arctic Region

I am undertaking the construction of a metal building warehouse in Northern Alaska built approximately 4' off the ground on 10" diameter wood pilings, 8' on center, spanning 40' x 75'. I am looking for creative alternatives to span the concrete floor accross the pilings with a 6" thick heated slab that will also need to be insulated underneath to keep the permafrost from melting over time.