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Description: A preliminary study was made to find a replacement for 12.5-mm, 5-ply Douglas fir plywood, previously used for gussets in Canada Plan Service trusses, and now in short supply. The proposed alternative, 18.5-mm, 5-ply Douglas fir plywood, requires larger 4.5 x 76-mm concrete nails to maintain full double-shear. This study evaluated the load-deformation behavior of these connections and assessed the effects of nailing patterns. Results indicated that the proposed alternative better matched the strength of the sawn lumber frame members. Results also indicated that a 4.5 x 76-mm concrete nail had a mean safe working load of 1.25 kN (working stress design method), corresponding to a unit lateral resistance of 2.14 kN (limit states design method). These values were for joints using 14 nails and were 8% lower than for joints using four nails.

Keywords: strength and resistance of nailed plywood joints for canada plan service trusses
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Citation: Masse, D.I., Salinas, J.J. and J.E. Tumbull 1988. STRENGTH AND RESISTANCE OF NAILED PLYWOOD JOINTS FOR Canada PLAN SERVICE TRUSSES. Canadian Agricultural Engineering 30(2):283-288.
Volume: 30
Issue: 2
Pages 283 - 288
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Date: 1988
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Coverage: Canada
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