Longitudinal shear strength of LVL via the five-point bending test
1993
Hunt, M.O. | Shook, S.R. | Bradtmueller, J.P.
The five-point bending test efficiently evaluates the interlaminar shear properties of cross-aligned, layered, structural wood composites, e.g., oriented strandboard (OSB). This research examined the applicability of the test to evaluate the shear strength of a unidirectionally aligned wood composite, laminated veneer lumber (LVL). In the case of LVL, interlaminar shear strength is referred to as longitudinal shear resulting from the lumber-like member loaded as a plank in bending. Test material was nominal 1-1/2-inch-thick commercial southern pine LVL. Three test methods were used to evaluate shear strength: the five-point bending test, a modified ASTM D 143 shear block test, and a short-beam shear test. The short-beam test had a span of 10 inches (L/d of 6.7). For the five-point test, nine L/d ratios were used: 8 to 24 in increments of 2. As had previously been observed with OSB, the apparent shear strength decreased with increasing L/d, but at a decreasing rate. Over a range of L/d ratios of 14 to 18, shear strength was essentially constant. The average strengths and coefficients of variation by test method were: modified ASTM D 143 test - 920 psi, 18 percent; short-beam test - 830 psi, 9.4 percent; and five-point bending test - 690 psi, 8.1 percent.
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