Mechanical properties of laminated veneer lumber made from interior Douglas-fir and lodgepole pine
1992
Hesterman, N.D. | Gorman, T.M.
Currently, laminated veneer lumber (LVL) produced in the Pacific Northwest is primarily made from veneers of Coast Douglas-fir. Concerns regarding the continuing supply of Coast Douglas-fir have fostered investigation into the use of other, less utilized species in the production of LVL. This research compares the mechanical properties of LVL made from interior north Douglas-fir and lodgepole pine to those of conventional LVL. Twenty-eight 1.5- by 27- by 96-inch billets were manufactured from 0.1-inch veneers in a random layup. The billets were then sawn into samples for investigating eight mechanical properties, including the modulus of elasticity (MOE), modulus of rupture (MOR), and compression strength parallel to the grain. Preliminary design values were constructed for each property for comparison, on the basis of similar MOE, with commercially available 2.0E and 2.2E Coast Douglas-fir LVL. The average MOE for the lodgepole pine LVL was 1,950,000 psi, while the preliminary design values in bending and compression parallel to the grain were approximately 15 percent lower than those of 2.0E Coast Douglas-fir LVL. The MOE for the interior Douglas-fir LVL was 2,220,000 psi, and the design values for bending and compressive strength were about 87 and 82 percent, respectively, of that for 2.2E Coast Douglas-fir LVL. This research demonstrates that LVL with good bending and compressive strength properties, similar to 2.0E Douglas-fir LVL, can be manufactured from interior Douglas-fir and lodgepole pine.
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