CLTを用いた引きボルト接合部の引張性能に材料密度および曲げヤング係数が及ぼす影響

摘要

全ての試験結果を概観すると，曲げヤング係数と初期剛性，密度と最大荷重の間には僅かに比例関係が見られた。しかしながら，少なくとも引きボルト接合部においては，A種構成とB種構成，異等級と同一等級では，個体間のばらつきによる影響の方が大きく，構造設計においてはこれらを意図的に使い分けることはあまり意味がなさそうである。また，A種構成より材質のばらつきを抑えたB種構成，曲げヤング係数を調整した試験体60Sにおいては強度性能のばらつきへの影響がほとんど見られなかったが，密度管理を行ったDSについては強度性能のばらつきが少なくなる傾向にあり，結果的に降伏耐カや最大荷重が他の試験体より高くなった。%Cross-laminated timber (CLT) panels consist of several layers of lumber stacked crosswise and glued together on their faces. These laminations were screened according to the mechanical grading method in Japanese Agricultural Standard (JAS) for glued laminated timber. We conducted a tensile test on tensile bolt joints with CLT. The CLT specimens were 8 types as follows ；1)-6) manufactured in accordance with J AS for CLT, 7) manufactured by restricting a MOE of the laminae from 6.0 to 7.0 GPa, 8) manufactured by restricting a density of laminae from 405 to 435 kg/ m~3. As a result, statistical processing about this test data showed the proportional relation between the MOE and the rigidity and between the density and the maximum load. Though the diminution of the MOE inhomogeneity didn't show a remarkable improvement of the strength properties, the diminution of the density inhomogeneity slightly increased the strength properties.