Influence of Whorled Knots on the Bending Strength of Japanese Red Pine (<i>Pinus densiflora</i>) Two-side-surfaced Beams

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  • 横架材としてのアカマツたいこ材の曲げ強度性能に及ぼす輪生節の影響
  • オウカザイ ト シテ ノ アカマツタイ コザイ ノ マゲ キョウド セイノウ ニ オヨボス リン ナマリブシ ノ エイキョウ
  • Influence of Whorled Knots on the Bending Strength of Japanese Red Pine (Pinus densiflora) Two-side-surfaced Beams

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To study the influence of whorled knots on the bending strength of Japanese red pine (Pinus densiflora) two-side-surfaced beams, static bending tests were conducted for each visual grade specified by the Japanese Agricultural Standard for lumber. Rectangular beams were also tested for comparison. The influence of whorled knots on bending strength was less for two-side-surfaced beams than rectangular beams, and the maximum load of two-side-surfaced beams was significantly higher than that of rectangular beams of low visual grade. Based on the experimental data, the estimated maximum load ratios of two-side-surfaced beams to rectangular beams were 1.59, 1.62, and 1.95 for visual grade I, II, and III, respectively, when both beams were sawn from 300mm-diameter logs. It was shown that the two-side-surfaced beams had more advantages than rectangular ones in regard to efficient use of logs with identical diameter.

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 59 (4), 179-187, 2013

    The Japan Wood Research Society

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