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Estimating Strength of Finger-jointed Dimension Lumber by Nondestructive Methods

chinese forestry Science and Technology 2010年第2期9卷 62-67页

作者： zhou haibin ren haiqing luo xiuqin jiang jinghui reseach institute of wood industry, chinese academy of forestry, {2. 100091, p.r.china

Structural finger-jointed (FJ) lumber was used mainly in structural applications including glue-laminated beams and wooden I-joists and more recently in parallel chord wood trusses. The paper evaluated st{2.gth properties of structural FJ lumber by three nondestructive methods (edge-wise bending, longitudinal and transversal vibration) in order to find an alternative to traditional evaluation methods. Lumber was sawn from the logs following a pattern typically used in china to maximize the volume of recovered sawn timbers. After kiln-dried, these rough-sawed lumbers were planned to 4.5 cm thick, 9.0 cm wide and 100cm long. The lumber pieces were assigned to two groups (low-grade and high- grade groups) according to their dynamical modulus of elasticity. FJ lumber was produced by cutting a series of sloping fingers (finger length 2., 2. and 35 mm) on the end of the wood pieces to be joined and interlocking the two pieces. Each finger-jointed lumber with one same finger length had three types: L-L, L-H and H-H. The FJ lumber was nondestructively tested using edge-wise bending, longitudinal and transversal vibration methods. After three methods, tensile and bending st{2.gths of FJ lumber were tested to build dynamical relationships between MOE and st{2.gths. The results showed that dynamic MOEs were good indicators of the static MOE, but both dynamic MOE and static MOE had a bad correlation with tensile st{2.gth of finger jointed lumber.

关键词： finger-jointed lumber timber construction tensile strength bending strength nondestructive method

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