EXPERIMENTAL STUDY ON TENSILE PROPERTIES AND PRESUMPTION INDEX OF MADAKE (P.RETICULATA C.KOCH) FOR CRAFTS

We have developed the new earthquake resisting wall which made KAGOME-knits of the bamboo material. This study proposes the tensile properties of the bamboo material for crafts used as the material. Full-size tensile tests were conducted in order to examine the tensile character of 162 tensile specimen. And the correlation of thickness(t) of a node and a internode, and tensile properties was mainly examined. Main findings are given in the below. First, very strong linear relationships are observed between breaking strain and failure modes. And the difference of the thickness of right and left of a node had influenced the failure modes. Second, strong linear relationships are observed between tensile properties and t. Therefore, the stress grading based on t was examined as a next phase. As a result, it was found that it was effective. From these results in the above, the bamboo material, of which quality is controlled by the present method, is available as structural bamboo, since stiffness, strength, and maximum load are guaranteed.