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The effect of global slope of grain on the bending strength of scaffold boards

Einfluss der Faserabweichung auf die Biegefestigkeit von Gerüstdielen

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Abstract

A study is described, carried out on specially prepared specimens, that specifically examines the effect of slope of grain on the bending strength of scaffold boards. Each specimen was visually graded and both the modulus of rupture and modulus of elasticity in bending determined. From the effect of slope of grain on the reduction of bending strength revised visual grading rules have been suggested that include a slope of grain limit of 1 in 12. It has also been demonstrated that machine grading is as effective at determining the adverse effect of slope of grain on board strength as it is for other defects such as high rate of growth and knots.

Zusammenfassung

Anhand speziell präparierter Proben wurde der Einfluss der Faserabweichung auf die Biegefestigkeit von Gerüstdielen untersucht. Jede Diele wurde visuell sortiert und die Biegefestigkeit sowie der Biege-E-Modul wurden bestimmt. Unter Beachtung des Einflusses der Faserabweichung auf die Reduzierung der Biegefestigkeit wurde vorgeschlagen, die visuellen Sortierregeln zu modifizieren und die Faserabweichung auf einen Wert von 1:12 zu begrenzen. Es konnte auch gezeigt werden, dass der negative Einfluss der Faserabweichung mittels maschineller Sortierung in gleicher Weise wie andere festigkeitsmindernde Einflüsse wie z.B. geringe Rohdichte oder Äste erkannt wird.

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Authors and Affiliations

  1. University of Brighton, Brighton, UK

    D.J. Pope

  2. Timbersolve Ltd, Lenten Street, Alton, UK

    J.P. Marcroft & L.R.J. Whale

Authors
  1. D.J. Pope
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  2. J.P. Marcroft
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  3. L.R.J. Whale
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Correspondence to D.J. Pope.

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Pope, D., Marcroft, J. & Whale, L. The effect of global slope of grain on the bending strength of scaffold boards. Holz Roh Werkst 63, 321–326 (2005). https://doi.org/10.1007/s00107-005-0010-y

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  • DOI: https://doi.org/10.1007/s00107-005-0010-y

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