Tensile Strength of One-, Two-, and Three-Ply Glulam Members of 2 By 6 Douglas-Fir

A comparison of the tensile strength of single-ply with two- and three-ply glulam members revealed the expected increase in strength of two-ply members as compared to the single-ply. No further increase was apparent for three-ply members. Of the various physical properties, modulus of elasticity was the best single predictor of tensile strength. Knot size, which is the basis of the current visual grading system, was a relatively poor overall predictor of strength but appears to be a necessary part of a grading system in that it is useful in identifying low strength pieces. These data will be useful to those responsible for developing design stresses for glulam timber.

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