Add to ORKGRad se sastoji od dva dijela. U prvome se teoretski obrađuju pojmovi vezani za prednapeti beton i stropne prednapete betonske ploče općenito, posebnosti stropnih prednapetih ploča nosivih u dva smjera te metode proračuna i uvjeta koje one moraju zadovoljiti. U drugome dijelu se provodi sam proračun jedne takve stropne ploče zgrade aerodroma velikih raspona oslonjene na stupove bez greda.Final thesis is separated in two parts. The first part is based on theoretical concept of prestressed concrete, two way slabs made of prestressed concrete, specifics of two way slabs, calculation methods and their requirements. The second part presents analysis of two way slab, with long spans supported by columns without beams, used for airport