Effects of Wood Decay on the Shear Performance of Nailed Timber Joint

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  • 木材腐朽が釘接合部のせん断性能に及ぼす影響
  • モクザイ フキュウ ガ クギ セツゴウブ ノ センダン セイノウ ニ オヨボス エイキョウ

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Abstract

Degradation of shear resistance of nailed joints by wood decay was estimated experimentally. We conducted decay treatments of Todomatsu (Abies Sachalinensis) specimen for compressive and single-shear tests of nailed joints with Todomatsu main members, steel side plates and CN50 nails by brown-rot fungus (Fomitopsis palustris), which is commonly observed in Japan. After the decay treatment, we measured the compressive strength parallel to the grain and the single shear resistance of nailed joints, and the depth of steel pin penetration burst into the wood. Test results showed that degradation of the maximum shear resistance of the nailed joints at an early stage of decay was not as rapid as the degradation analogized by compressive strength, which is often fitted with an exponential curve. Tearing of nail heads, which caused brittle joint failures, was typically observed in the tests of sound nailed joints in this study. The nails of decayed joints, however, were pulled from the wood members before being torn off at their heads. This difference in failure mode resulted in a gradual decrease of lateral loads beyond the maximum resistance without sudden drops of loads. The degradation of the maximum shear resistance of decayed nailed joints was compared with the estimated resistance by the European Yield Theory (EYT) based on the bearing strengths of the wood members derived empirically from the depth of steel pin penetrations, which showed the ultimate shear resistance of decayed nailed joints could be estimated from onsite measurement of the depth of steel pin penetration.

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 56 (1), 41-47, 2010

    The Japan Wood Research Society

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