Evaluation of Young's Moduli of Sugi for Its Application as Machine Stress-Rated Framing Lumber

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Other Title
  • MSR（Machine Stress-Rated）枠組材への適用に向けたスギの各種ヤング係数の評価
  • Study with nominal size of 204 and 206
  • 寸法型式204と206による検討

Abstract

<p>The use of domestic timber as a horizontal structural material for wood frame construction lumber is desired. In this study, we assume that sugi (Japanese cedar, Cryptomeria japonica) must be graded as a machine stress-rated (MSR) framing lumber, which conforms to Japanese agricultural standards for structural lumber and fingerjointed structural lumber for wood frame construction (JAS 0600). However, several technical issues must be addressed when using wider and thicker materials. The following conclusions were drawn from the study of various Young's moduli based on a sample with nominal sizes of 204 and 206. Results showed that the applied loading surface (the bark and pith sides) did not affect the Young's modulus bending. Furthermore, the effect of the presence of the largest knot on the Young's modulus bending was minor. The longitudinal and flexural vibration methods (flatwise) were considered useful for measuring Young's modulus for quality control. The classification of specimens based on the current MSR framing lumber grades indicated that Young's modulus bending, not the bending strength, was the determining factor for the grade.</p>

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 70 (2), 46-55, 2024-04-25

    The Japan Wood Research Society

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