Tensile-strength incidence mechanism of structural finger-jointed laminae

The mechanism of tensile-strength incidence of structural finger-jointed laminae was investigated. Tensile Young?s moduli and strains at the finger joint (FJ) and the solid members near the FJ were measured using strain gauges. Sugi (Cryptomeria japonica D. Don) lumber was used. All failures occurred at the FJ, mostly at the base of the FJ with a lower tensile Young?s modulus. The values of the tensile Young?s moduli and strains at the FJ were almost equal to the average of the values of the solid members near the FJ. With a linear elastic theory of stress, the tensile Young?s moduli, strains, and tensile strengths at the FJ were calculated. The theoretical values accurately agreed with the test data. From correlation to the tensile strength of the FJ, maximum strain energy, instead of maximum strain, was considered to be a better failure criterion for characterizing the behavior of the FJ.

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