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Description: The Canada Plan Service (CPS) has developed several structural diaphragm ceiling designs which use the shear strength of galvanized steel to resist horizontal wind forces on farm buildings. These de signs were based on the shear strength of galvanized roofing steel as determined by Turnbull and Guertin (1975), but for more rapid fastening of the ceiling steel, power-driven roofing screws have now replaced the hammer-driven roofing nails used previously. Turnbull (1964) outlined the importance of fastening the diaphragm ceiling cladding along all four edges of each sheet. For a corrugated sheet steel ceiling, it is easy to screw-fasten the lapped end joints of the steel sheets directly to the underside of roof trusses, but the longitudinal joints also require a shear connection. Some CPS plans show wood blocking sawn to fit the shape of the steel rib (Fig. 1). This blocking must be held in place by a workman in the attic above while a second workman drives a row of screws from below (see 4, Fig. 1). This screwed connection develops highly efficient lap-joint shear (where shear flow is sheet-screw-sheet). This was previously shown (Turnbull 1964) to be about twice as rigid as a butted shear joint (as with thicker sheet material such as plywood), where shear flow must follow a longer path (sheet-screw-wood-screw-sheet).

Keywords: screwed connections for corrugated steel diaphragm ceilings in farm buildings
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Citation: Masse, D. I., Turnbull, J. E. and C. J. Williams 1983. Screwed Connections for Corrugated Steel Diaphragm Ceilings in Farm Buildings. Canadian Agricultural Engineering 25(1):95-100.
Volume: 25
Issue: 1
Pages 95 - 100
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Date: 1983
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Coverage: Canada
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