BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis

The present paper reports the results of an investigation regarding the determination of bending strength and stiffness in full-size poles of Argentinean Eucalyptus grandis. The importance of accurately knowing the mechanical properties of this material has increased with the increasing demand of ut...

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Autores principales:	Torrán,E.A, Sosa Zitto,M.A, Cotrina,A.D, Piter,J.C
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2009
Materias:	Poles Eucalyptus grandis strength and stiffness
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2009000100006
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spelling	oai:scielo:S0718-221X20090001000062009-05-22BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandisTorrán,E.ASosa Zitto,M.ACotrina,A.DPiter,J.C Poles Eucalyptus grandis strength and stiffness The present paper reports the results of an investigation regarding the determination of bending strength and stiffness in full-size poles of Argentinean Eucalyptus grandis. The importance of accurately knowing the mechanical properties of this material has increased with the increasing demand of utility poles of this species and with the use of modern procedures aimed at achieving a reliable and economical structural design. For this purpose an empirical research project with two samples containing new, green, untreated poles was carried out according to the procedures adopted by both the American standard ASTM D 1036 (2005) and the Argentinean standard IRAM 9529 (2004) for cantilever bending tests. Sample 1 enclosed 14 year-old poles with nominal length of 12 m and Sample 2 enclosed 11 year-old poles with nominal length of 8 m. The results found for the average circumference taper were similar to the values adopted by the American standard ANSI 05.1 (2002) and knot dimensions as well as knot ratio compared well with those permitted by this standard. The mean value found for maximum fibre stress at ground line reached 62.9 N/mm² for Sample 1 and 56.3 N/mm² for Sample 2. These strength results are relatively high in comparison with values reported for seasoned sawn timber of the same species and they compare well with those published by the American standard ANSI 05.1c (2004) for poles of different species. Both samples showed a coefficient of variation of 13 % for strength at ground line which is relatively low in comparison with those adopted by the American standard and may be considered an advantage of this material for structural purposes. The mean value found for modulus of elasticity reached 10935 N/mm² for Sample 1 and 9546 N/mm² for Sample 2, with a coefficient of variation of 14 % for both cases. Results also revealed significant differences between mechanical properties values corresponding to the two samples containing poles with different sizes and age. The correlation coefficient between knot ratio and strength showed the insignificant values of 0.09 and 0.02 for Sample 1 and 2 respectively, and the corresponding results between modulus of elasticity and strength were 0.52 and 0.37.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.11 n.1 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2009000100006en10.4067/S0718-221X2009000100006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Poles Eucalyptus grandis strength and stiffness
spellingShingle	Poles Eucalyptus grandis strength and stiffness Torrán,E.A Sosa Zitto,M.A Cotrina,A.D Piter,J.C BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis
description	The present paper reports the results of an investigation regarding the determination of bending strength and stiffness in full-size poles of Argentinean Eucalyptus grandis. The importance of accurately knowing the mechanical properties of this material has increased with the increasing demand of utility poles of this species and with the use of modern procedures aimed at achieving a reliable and economical structural design. For this purpose an empirical research project with two samples containing new, green, untreated poles was carried out according to the procedures adopted by both the American standard ASTM D 1036 (2005) and the Argentinean standard IRAM 9529 (2004) for cantilever bending tests. Sample 1 enclosed 14 year-old poles with nominal length of 12 m and Sample 2 enclosed 11 year-old poles with nominal length of 8 m. The results found for the average circumference taper were similar to the values adopted by the American standard ANSI 05.1 (2002) and knot dimensions as well as knot ratio compared well with those permitted by this standard. The mean value found for maximum fibre stress at ground line reached 62.9 N/mm² for Sample 1 and 56.3 N/mm² for Sample 2. These strength results are relatively high in comparison with values reported for seasoned sawn timber of the same species and they compare well with those published by the American standard ANSI 05.1c (2004) for poles of different species. Both samples showed a coefficient of variation of 13 % for strength at ground line which is relatively low in comparison with those adopted by the American standard and may be considered an advantage of this material for structural purposes. The mean value found for modulus of elasticity reached 10935 N/mm² for Sample 1 and 9546 N/mm² for Sample 2, with a coefficient of variation of 14 % for both cases. Results also revealed significant differences between mechanical properties values corresponding to the two samples containing poles with different sizes and age. The correlation coefficient between knot ratio and strength showed the insignificant values of 0.09 and 0.02 for Sample 1 and 2 respectively, and the corresponding results between modulus of elasticity and strength were 0.52 and 0.37.
author	Torrán,E.A Sosa Zitto,M.A Cotrina,A.D Piter,J.C
author_facet	Torrán,E.A Sosa Zitto,M.A Cotrina,A.D Piter,J.C
author_sort	Torrán,E.A
title	BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis
title_short	BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis
title_full	BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis
title_fullStr	BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis
title_full_unstemmed	BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis
title_sort	bending strength and stiffness of poles of argentinean eucalyptus grandis
publisher	Universidad del Bío-Bío
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2009000100006
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BENDING STRENGTH AND STIFFNESS OF POLES OF ARGENTINEAN Eucalyptus grandis

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