Factors influencing the flexural properties of finger-jointed southern ping LVL
1993
Biblis, E.J. | Carino, H.F.
Flexural strength and stiffness values of finger-jointed jointed southern yellow pine 2 by 4 laminated veneer lumber (LVL) tested edgewise in two conditions are presented. The evaluation included two finger-joint orientations, two direction-of-load applications with respect to veneer glue planes, and two types of veneers (from young plantation and mature stands). The results indicate that the maximum flexural strength of finger-jointed LVL in both the original dry and moisture-cycled conditions was obtained when the finger-joints were machined perpendicular to the veneer glue planes and the specimen was loaded edgewise to the finger-joints. The direction-of-load application is considered a more significant factor than finger-joint orientation. Relative differences in modulus of elasticity (MOE) among the various combinations of finger-joint orientations and direction-of-load applications are smaller than differences in values of modulus of rupture (MOR). The effects of moisture cycling LVL finger-jointed specimens on both MOR and MOE are significant, resulting in MOR reductions up to 40 percent and MOE reductions up to 24 percent. Finger-jointing LVL specimens resulted in significant reductions in MOR and MOE values when compared to unjointed specimens. Under both dry and moisture-cycled test conditions, MOR and MOE values for finger-jointed LVL specimens from mature trees are significantly different from those obtained from 20-year-old plantation-grown trees.
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