Abstract
AbstractLaboratory tests were used to quantify the effects of section shape, screw density, and polyurethane adhesive use on laminated wood assembly bending strength and stiffness. Both I-shaped sections and vertically laminated rectangular sections were studied, each utilizing three 38×140-mm members. I-sections featured dimension lumber flanges screwed to laminated strand lumber (LSL) webs. In half of these assemblies, polyurethane adhesive was used in addition to screws. Only screws and dimension lumber (no LSL or adhesive) were used in fabrication of the vertically laminated assemblies. Bending strength and stiffness were significantly increased by the reconfiguration of members into an I shape. Composite action, and therefore bending strength and stiffness, was significantly increased by the addition of polyurethane adhesive to I-sections. This research presents an efficient assembly design with bending strength and stiffness values significantly higher than those of the current industry standard mec...
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