Bending Performance of Sugi Flat Square without Pith Sawn from Large Diameter Logs

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  • 大径材から得られたスギ心去り平角材の曲げ性能
  • タイケイザイ カラ エラレタ スギシン サリ ヒラカクザイ ノ マゲ セイノウ

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Abstract

Since the ratio of Sugi (Cryptomeria japonica D. Don) large diameter logs is remarkably increasing with stepping up accumulation of Sugi plantation in Japan, expanding the demands of these logs has become an urgent issue. Because the use rate of domestic lumber to wooden houses in Japan is considerably low, particularly beams with only several percent usages, using Sugi lumber as beams in these houses seems to be an effective measure. However, application of lumber without pith as a member of wooden houses is not necessarily popular, whereas it can be sawed up from large diameter logs with good yields. That is because lumber without pith has been considered to be weaker than lumber with pith. From these background, mechanical properties of flat square without pith, which was obtained from Sugi large diameter logs produced in Miyazaki Prefecture, including comparison with flat square with pith was examined. As a result, flat square without pith is equal to the one with pith both in quality and mechanical properties regardless of cutting or sawing method. This result shows that flat square without pith can be used as beams in wooden houses like flat squares with pith. In order to put it into practical use in the future, short-term performance of the connections; and long-term performance of the members and connections need to be examined.

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