No.7（2012）14.The behavior of proof strength and fastening torque on timber bolted joint

Doppo Matsubara, Masahiro Shimada

  The conservation of fastening torque on timber bolted joints is ill-defined due to drying contraction and stress relaxation of wood. This paper is concerned with the fastening torque and strength of the double shear bolted timber-to-timber joints. In this study, we experimentally measured the fastening torque by considering the size of the metallic washer. As a result, the first slip coefficient and proof strength demonstrated an upward trend as the fastening torque and metallic washer increased. Then, deformation characteristics were obtained that showed contrasting behavior as the metallic washer was increased. Also, the existent calculation formula for the first slip coefficient and proof strength differed from the experimental results. The existent calculation formula for the First slip coefficient was higher than in the experiment, and the existent calculation formula for proof strength was lower than the experimental result.

Keywords
Wood, Bolted Joint, Fastening Torque, Strength

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