| 摘要 |
This invention relates to a sheet metal structural shape for use in building construction having a generally box shape with outwardly extending flanges at one end of the substantially parallel sides and inwardly extending flanges at the other end of the parallel sides forming a slot between the ends of the inwardly extending flanges and a closure between the ends of the outwardly extending flanges closing the space between the sides at that end. The sheet metal structural shape may be advantageously used as a structural shape in deck structures and in wall structures according to this invention. One deck structure of this invention uses the sheet metal structure shape as a sub-purlin, or purlin on short spans, supporting insulation on the bottom outwardly extending flanges and having sheet metal roofing material fastened to the inwardly extending flanges at the top end of the structural shape. Thus, a deck is provided with at least a major portion of the insulation beneath the steel roof decking. Additional insulation may be applied above the steel roof decking and/or poured concrete may be applied above the steel roof decking. The structures of this invention provide lightweight insulated fire resistant structures obtaining hourly fire ratings when preferred materials are used. The wall structure of this invention provides a wall which may be entirely erected from one side, providing especially suitable shaft wall construction.
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