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Dimensional stability and mechanical performance of face-glued spruce-pine-fir and Douglas-fir studs

Cook Sophia, Ghavidel Amir, Zhou Jianhui

Drewno : prace naukowe, doniesienia, komunikaty

2024

Vol. 67, nr 214

Art. no. 193420

Warpage of dimensional lumber has been identified as the major issue for its use in wood construc tion prefabrication in North America. Face-gluing is a promising technique to mitigate warping of dimensional lumber. This paper studies the dimensional stability and mechanical performance of 2-ply face-glued lumber as a means of reducing warpage in both spruce-pine-fir (S-P-F) and Douglas-fir (D. fir) lumber. Planks were paired and subsequently laminated based on their initial dynamic modulus of elasticity (MOE) and shape compatibility. Warp was measured in twist, bow, and crook at varying moisture contents. Mechanical performance was measured in terms of the MOE, modulus of rupture (MOR), and shear strength. This pairing regime between component planks offers a means to reduce the twist and bow tendencies of face-glued lumber while increasing the unifor mity of lumber strength. Flexural MOE and MOR performances were consistent with visual grades No.1/No.2, showing the potential of face-glued lumber as a value-added product for the automatic prefabrication of wood constructions.