Abstract
ABSTRACT SUITABILITY of resin and allowable stress tests were conducted on three composite glulam timber construction posts. The posts, manufactured with Cascophene LT-92 Phenol-Resorcinol resin and No. 2 KD15 southern pine, were fabricated by splicing preservative-treated and untreated glulam sections. The two sections consisted of three or four plies of 50 mm (2 in.) nominal lumber. Suitability of resin was evaluated from the flexural strength of individual laminate finger joints, shear strength of glue lines and delamination of glue lines exposed to cyclic wetting and drying. The resin was found to be suitable for service conditions for post frame construction. Full size specimens of the joint section of three sizes of glulam construction posts were tested in both flexure and compression. The allowable bending stress, allowable compressive stress parallel to the grain, and apparent elastic modulus for the posts with a 150 x 150 mm (6x6 in.) nominal cross-section were 10.83 MPa, 13.17 MPa and 11.47 GPa (1570, 1910 and 1.66 x 10^ psi), respectively. Corresponding values for posts with a 150 x 200 mm (6x8 in.) nominal cross-section were 11.45 MPa, 13.45 MPa and 11.32 GPa (1660, 1950 and 1.64 x 10^ psi), respectively). The apparent elastic modulus and allowable bending stress for posts with 200 x 200 mm (8 x 8 in.) nominal cross-section were 11.73 GPa and 13.86 MPa (1.70 X 10^ and 2010 psi), respectively.
Published Version
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