木船構造接手の研究(第1報) : 二材合せ肋骨

概要

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In this paper, the flexural rigidity and the strength of double-timbered frames when subjected to simple bending were investigated analytically and experimentally.The effects of the number and pitch of nails and the ratio of flexural rigidity of timber and the deformation factor of nails to the effective rigidity of double-timbered frame were evaluated and compared with experimental results. In general, when the deformation factor of nails is small, the effective rigidity attains to higher value of about 70% of the solid frame, and the number of nails gives little effects on the rigidity. On the other hand, when the deformation factor of the nails is large, the effective rigidity becomes rather low and it increases with the increase of the number of nails, until the effect becomes very little when the number of nails exceeds eight.The strength of double-timbered frame will be determined from the strength of nails which connect two timbers. Namely, the proportional limit of the double-timbered frame under bending will de predicted from the load at which the maximum reaction of the nails in the frame reaches at the proportional limit of the simple nailed joint just same as that of the frame, and the ultimate load of the frame is also determined from that of the same nailed joint.
社団法人日本船舶海洋工学会の論文