INFLUENCE OF FIRE EXPOSURE ON THE MECHANICAL PROPERTIES OF WOOD

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  • 火災加熱が木材の力学的性能に及ぼす影響
  • 火災加熱が木材の力学的性能に及ぼす影響 : 加熱した針葉樹材及び広葉樹材の高温時及び加熱冷却後のヤング係数・曲げ強度の測定
  • カサイ カネツ ガ モクザイ ノ リキガクテキ セイノウ ニ オヨボス エイキョウ : カネツ シタ シンヨウジュザイ オヨビ コウヨウジュザイ ノ コウオンジ オヨビ カネツ レイキャク ゴ ノ ヤング ケイスウ ・ マゲ キョウド ノ ソクテイ
  • -Exposure temperature dependence of Young's modulus and bending strength of Cryptomeria japonica, Larix leptolepis, Pseudotsuga menziesii and Zelkova serrata under and after heating-
  • －加熱した針葉樹材及び広葉樹材の高温時及び加熱冷却後のヤング係数・曲げ強度の測定－

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Abstract

Young's modulus and bending strength of 3 species of wood commonly used for engineered wood and Zelkova, hardwood normally used for traditional large building, heated up to 250℃ are measured at the elevated temperature and after cooling to the room temperature as an engineering basis for the structural fire safety design and the reusability diagnosis of large-scale timber buildings. The results show the both properties, either at elevated temperature or after cooling, are highly dependent on exposed temperature for 150-200℃ or higher, and correlation between the Young's modulus and the bending strength tends to become weaker with rise of exposed temperature. The bending strength at elevated temperature is found to converge while it is notably scattered at normal temperature.

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