Joist girder deck, also known as reinforced steel joist formwork, is a composite structural system formed by processing the main reinforcing steel in the deck at a factory with specialized equipment into a steel joist, and then welding the steel joist with galvanized steel plate to form an integrated structure. During the construction stage of the structural deck, this system replaces the construction formwork with galvanized steel plate, and together with the steel joist structure welded to the reinforcing steel in the structure, it bears the self-weight of the deck concrete and the construction loads. After the concrete is poured, it forms a reinforced steel joist concrete deck that withstands the service loads during use.