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Maderas. Ciencia y tecnología

versión On-line ISSN 0718-221X

Resumen

FANK, Pamela Y; STEFANI, Pablo M  y  PITER, Juan C. Machine strength grading of boards of resinous pines cultivated in the northeast of Argentina. Maderas, Cienc. tecnol. [online]. 2017, vol.19, n.3, pp.247-264.  Epub 28-Abr-2017. ISSN 0718-221X.  http://dx.doi.org/10.4067/S0718-221X2017005000021.

The present paper reports the results of an investigation regarding the analysis of models for machine strength grading boards of resinous pine cultivated in the northeast of Argentina. An empirical research project with one sample containing 233 boards in structural sizes subjected to static bending and one sample enclosing 100 boards subjected to tension was carried out according to the European standards. One model based on a single parameter (modulus of elasticity) and another one based on a combined parameter (modulus of elasticity + density + knot ratio) were designed. Results showed that the efficiency of both models was higher than that of the visual method adopted by the standard IRAM. The high efficiency of both models was made evident by: i) the achievement of the characteristic values adopted by standards for the main properties; ii) an increase of the yield in the structural grades and, iii) a decrease of the spread results for modulus of elasticity within each strength class, which makes it possible to satisfy the variability requirements adopted by the national design rules.

Palabras clave : Pinus taeda; Pinus eliottii; sawn timber; strength grading; strength; stiffness.

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