Development of a load-slip test apparatus for nailed joints

An apparatus was developed for testing typical light frame construction nailed connections. The key features of the apparatus are: 1) it prevents rotation of the members as a result of load eccentricity; 2) it provides lateral support to the sheathing member under load; and 3) it maintains any prescribed gap throughout the test. Typical nailed connections of plywood or waferboard sheathing, fastened to spruce dimension lumber with a 63.5 mm common nail, were tested for lateral strength and load-slip relationship using this test apparatus and the apparatus recommended in ASTM D 1761. Load-slip data obtained using this apparatus compared favorably with elastic stiffness computed on the basis of Kuienzi’s elastic foundation theory. Values given by the ASTM test for stiffness did not compare well. It is recommended that this new Forintek apparatus be used to obtain load-slip data on typical sheathing-to-framing joints.

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