19 モウソウチクの曲げ強さ

概要

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The distribution of the bending strength in culm was studies with 32 bamboos (Phyllostachys Pubescens) grown at several districts of Japan. The results derived from this experiment indicate that;1) The outer part of culm is far higher in bending strength than the inner part. But the djfference in the bending strength of these two parts and the thickness of the culm wall become small with the height from the ground. That is, the bending strength of the inner part increases with the height while that of the outer part slightly changes. These tendencies apply to almost all the test bamboos.2) The strength ratio between the node and the internode of culm, say λ, is considered to vary markedly with each individual bamboo, whereas the difference between the λ of the inner and of the outer parts or of the lower and of the upper parts on culm of the same bamboo, is comparatively small. In this experiment, the lowest value of λ is 0.74,the highest is 1.32,and generally speaking, the bamboo of which is inferior to internode in bending strength and the bamboo of which node is superior to internode appeared to an epual degree.
日本森林学会の論文
1949-04-30