ボルトと木材の摩擦係数: 鉄骨木質構造の研究　その11

摘要

前稿では，木材と鋼材の平面どうしの接触状態における滑り摩擦係数を実験的に調査した結果を報告した。その試験方法は圧縮一引抜き法と呼ばれるもので，木材の圧縮強さの75％に達する高圧下での摩擦係数を明らかにした。本稿はその続編で，曲面接触状態での滑り摩擦係数を知るために，新たに圧縮－トルク法と呼ばれる試験方法を導入し，ボルトと木材の摩擦係数を調査したものである。%Coefficient of friction between bolt and wood was experimentally investigated. The friction was measured by a torque meter during the rotation of the bolt compressed by wood plates in the direction parallel to the grain. The testing parameters are contact geometry (conforming and non-conforming), wood species (Japanese cedar and SPF), contact pressure (three levels), and roughness of bolt surface (fine and coarse). The coefficient of static friction was influenced by the roughness of the bolt surface, but is scarcely influenced either by the contact geometry, the wood species, and the contact pressure. The friction associated with a heavy contact caused yielding in the wood, which reduced the coefficient of friction like incomplete friction.