Investigation of Various End Joints in Parallel-Laminated Veneer

Douglas-fir parallel-laminated veneer (PLV) specimens with various end-joint types were tested in flatwise bending, edgewise bending, and tension. Results of these tests indicate that six-ply PLV members with 1/4-inch plies and 1 in 12 sloped scarf joints cut in either individual plies or multiple plies, and members with staggered butt-jointed interior plies and scarf-jointed exterior plies have generally comparable strengths with members with no joints. The group with distributed butt joints consistently had the lowest strength. The modulus of rupture of this group can be improved by simply using thinner plies on the outsides. The strength of the finger-jointed members was below that of the nonjointed members and above the staggered butt-jointed specimens. The modulus of elasticity results generally followed the same trends as those noted for strength.

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