| 摘要 |
A unitized and prefabricated prestressed roof and ceiling subassembly which employs a first substantially flat sheet of material which serves as the ceiling of the structure and a second relatively flat sheet or layers of sheets of material of width equal to the first sheet of material and of greater length wherein the second sheet or the second layer of sheets of material are bowed into an arc of chord length equal to the first sheet of material and wherein its edges are attached to the edges of the first sheet of material to provide a unitized prestressed roof and ceiling structure. The arch height to span length of the assembly is preferably within the range of from 5 to 10 percent. A plurality of the subassemblies can be joined at their ends and edges to form bays and adjacent bays of a building structure. The subassemblies can include lighting fixtures and ventilation and air conditioning apertures and the individual subassemblies can be partitioned to provide air conditioning, supply and return air ducts in combination with the ceiling and roof decks. Insulation may be permanently attached to the inner surface of the bowed and/or flat member. The bowed member may include enclosed channels which serve as electrical wiring conduits.
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