Comparison of two, glue-laminated, construction post configurations.
1990
Wright B.W. | Manbeck H.B. | Troxell D.F. | Blankenhorn P.R.
Allowable structural properties were determined for three composite, glue-laminated timber construction posts. The posts consisted of three or four glue-laminated plies of 50 mm (2 in.) nominal No.2 southern pine lumber fabricated by splicing preservative-treated and untreated sections. The splice consisted of lamina end finger joints oriented horizontally (or parallel) with the wide edge of the lamina. Full size specimens through the joint sections of three sizes of posts were tested to determine allowable structural material properties. The allowable bending stress, compressive stress parallel to the grain and apparent elastic modulus determined for the 150 X 150 mm (6 X 6 in.) nominal size category were 13.8, 14.8, and 16900 MPa (2000, 2150, and 2.47 X 10(6) psi), respectively. The allowable bending and compressive stress and apparent elastic modulus for the L50 X 200 mm (6 X 8 in.) nominal size category were 14.1, 14.8, and 11400 MPa (2050, 2150, and 1.66 X 10(6) psi), respectively. The allowable bending stress and the apparent elastic modulus were 15.5 and 13900 MPa (2250 and 2.03 X 10(6) psi), respectively, for the 200 X 200 mm (8 X 8 in.) nominal size category. These results are compared to a product of similar construction. The allowable values determined may not be representative of the entire population of posts using similar materials and resin systems.
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