Study of mechanical properties of wooden bolt-nut connector I: effect of size and shape of thread on withdrawal strength
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The withdrawal strength of a bolt-nut connector made from wood-based material was evaluated. The thread strength of the wooden bolt-nut connector was tested to select various parameters of the connector and the type of wood material; the wood materials tested were hard maple, white oak, ebony, glue-laminated bamboo, and densified Japanese cedar. A plane model of wooden threads with various thread angles was also evaluated. The results showed that the maximum failure load of the thread increased with increasing bolt density and connection area, which was calculated from the diameter of the bolt and the thickness of the nut. The withdrawal resistance after reaching the maximum load underwent a graded decrease because the bolt threads were broken one by one. In addition, the thread strength depended on the thread angle. In the model with a thread angle of 90°, compressive deformation in the transverse direction occurred prior to shear deformation along the root of the threads; the model with this thread angle thus had higher strength than those with other angles.
Key wordsBolt-nut connector Withdrawal strength Thread angle Densified wood
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- 6.Nishiuchi Y, Kanagawa Y, Fujiwara S, Goto J (2003) Tension strength of post-sill joints connected with full pinned mortise-andtenon joints, I. Effect of various joint conditions on maximum loads and yield loads (in Japanese). Zairyo 52(6):619–624Google Scholar
- 7.Nishiuchi M, Mori T (2003) High-performance bamboo nail (in Japanese). Summ Tech Pap Annu Meet Archit Inst Jpn 9:43–44Google Scholar
- 9.Nakata K, Sugimoto H, Inoue M, Kawai S (1997) Development of compressed wood fasteners for timber construction I. Mechanical properties of phenolic resin-impregnated compressed laminated veneer lumber (in Japanese). Mokuzai Gakkaishi 43(1):38–45Google Scholar
- 10.Inoue M, Norimoto M, Tanahashi M, Rowell RM (1993) Steam or heat fixation of compressed wood. Wood Fiber Sci 25(3):224–235Google Scholar
- 11.Ohtani T, Kitamura T, Kubojima Y (2004) Characteristics of compressed wood and its application. Trans Mater Res Soc Jpn 29(5):2463–2466Google Scholar