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STRENGTH OF STRUCTURAL FINGER-JOINTS REINFORCED WITH FIBERS

机译：纤维增强的结构指节点的强度

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The finger-joints are the kind of top joints most used in wood blades to manufacture glued laminated timber (GLULAM) and present direct influence on their rigidity and final mechanical strength. Thus, the objective of this study was to evaluate the tensile strength parallel to grain with different compositions of reinforcements concentrated on finger-joints. Two geometries were used to execute the finger-joints and two species: Pinus taeda and Eucalyptus spp. The reinforcements were fabrics from glass or carbon fibers bonded with polyurethane structural adhesive. The treatments used were: "A-Glass", "A-Glass2", "A-Carbon", “A-Without reinforcement”, "B-Glass", "B-Glass2", "B-Carbon" and “B-Without reinforcement”, being "A" or "B", the geometries and "2", the number of layers of tissue. For statistical analysis, the Dunnett test was used at 95% confidence interval. The results showed that the execution of the unreinforced finger-joints decreased the tensile strength of the woods. For P. taeda, all the treatments were significantly inferior to the control (without finger-joints), and for Eucalyptus spp., only the treatment "A-Unreinforced" presented inferior performance to the control (without finger-joints), all others presented equivalent mechanical resistance to solid wood. It can be concluded that for the Eucalyptus spp. wood, the application of reinforcement on the structural finger-joints improves the tensile strength, equating to the solid wood.
机译：指接是一种最常用于木质刀片以制造胶合层压木材（GLULAM）的顶部接缝，对它们的刚度和最终机械强度具有直接影响。因此，本研究的目的是评估平行于晶粒的抗拉强度，其中不同成分的增强物集中在指接上。使用了两种几何形状来执行手指关节和两种物种：taeda taeda和Eucalyptus spp。增强材料是玻璃或碳纤维与聚氨酯结构粘合剂粘合而成的织物。所使用的处理方法为：“ A玻璃”，“ A玻璃2”，“ A碳”，“ A-不加筋”，“ B玻璃”，“ B玻璃2”，“ B碳”和“ B” -“无加固”，其几何形状为“ A”或“ B”，组织的层数为“ 2”。为了进行统计分析，使用Dunnett检验以95％置信区间进行。结果表明，未加强的指接的执行降低了木材的拉伸强度。对于ta.taeda，所有处理均显着劣于对照（无指接），而对于桉树属，只有“ A-Unreineded”处理的性能较对照（无指接）差，所有其他处理表现出与实木相当的机械抵抗力。可以得出结论，对于桉树属。木材，在结构指接件上施加加固可提高抗拉强度，等同于实木。

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