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iForest - Biogeosciences and Forestry

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Validation of visual and machine strength grading for Italian beech with additional sampling

Michele Brunetti (1), Giovanni Aminti (1), Michela Nocetti (1)   , Giovanni Russo (2)

iForest - Biogeosciences and Forestry, Volume 14, Issue 3, Pages 260-267 (2021)
doi: https://doi.org/10.3832/ifor3649-014
Published: May 29, 2021 - Copyright © 2021 SISEF

Research Articles

Collection/Special Issue: Research Project PRIN-MIUR 2015
The forest-wood value chain: biomass supply, traceability, C-footprint. Innovation for bioarchitecture and energy efficiency
Guest Editors: Scarascia Mugnozza G, Maesano M, Romagnoli M


The typical variability of wood properties, higher than for other construction materials, requires a thorough knowledge of its mechanical performance. To make the use of wooden structural products safe and at the same time efficient, a proven methodology for the selection of the raw material is also crucial. As a general rule, the initial sampling is of vital importance to develop effective strength grading processes, but it is rarely verified with additional samples, besides those already included during the development of the grading procedure itself. Here, a new source of sawn timber was collected to verify the original sampling and to validate the visual and machine strength grading early developed for Italian beech. The new pieces were graded, destructively tested and the characteristic values of the graded material were calculated. The dispersion of the new data was found to be entirely included in that of the original data, proving an effective sampling of the resource variability. The correlations between properties were very similar comparing the original and the new sample, with the exception of the correlations between the dynamic modulus of elasticity and both bending strength and stiffness, which were lower in the new sample. The characteristic values of the graded new material were generally higher than the characteristics values of the corresponding strength classes as tabled in the technical standard. Only for one grade in the machine grading the strength reached 98.9% the class value, anyhow above the 90% required by the procedure of the checking of existing settings in a particular location, as provided by the related standard. In conclusion, the earlier development of the strength grading of Italian beech confirmed to be correct and safe.

  Keywords


Hardwood, Visual Grading, Machine Grading, Structural Timber

Authors’ address

(2)
Giovanni Russo 0000-0002-4957-7615
Gargano Land Reclamation Authority, Foggia (Italy)

Corresponding author

 
Michela Nocetti
michela.nocetti@cnr.it

Citation

Brunetti M, Aminti G, Nocetti M, Russo G (2021). Validation of visual and machine strength grading for Italian beech with additional sampling. iForest 14: 260-267. - doi: 10.3832/ifor3649-014

Academic Editor

Rodolfo Picchio

Paper history

Received: Sep 07, 2020
Accepted: Mar 02, 2021

First online: May 29, 2021
Publication Date: Jun 30, 2021
Publication Time: 2.93 months

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