Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading
The study analyses the relationship between local and global modulus of elasticity and develops and evaluates different models to predict local from global modulus measurements. The mechanical tests were performed on four species commonly used in Italy for structural purposes: fir, Douglas-fir, Corsican pine and chestnut. Two or three cross-sections and two provenances were sampled for each species. A theoretical analysis showed that the local-global modulus relationship was of polynomial form with only one coefficient. The effect of the species on the relationship was significant as well as the cross-section but only for softwoods. The effect of the cross-section was explained by the presence and the size of defects in the mid span. The different models were applied and then compared by means of the optimum grading: only slight differences among models emerged. Although optimum grading was strongly dependent on the sampling and on the grade combination, for softwoods the model for species and section showed very similar results to the grading with the true local modulus; inclusion of the knot values in the model led to only slight improvements. For chestnut all models were found to be comparable.
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dig-cirad-fr-5686802024-01-28T21:19:26Z http://agritrop.cirad.fr/568680/ http://agritrop.cirad.fr/568680/ Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading. Nocetti Michela, Brancheriau Loïc, Bacher Martin, Brunetti Michèle, Crivellaro Alan. 2013. Holz als Roh- und Werkstoff, 71 (3) : 297-308.https://doi.org/10.1007/s00107-013-0682-7 <https://doi.org/10.1007/s00107-013-0682-7> Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading Nocetti, Michela Brancheriau, Loïc Bacher, Martin Brunetti, Michèle Crivellaro, Alan eng 2013 Holz als Roh- und Werkstoff K50 - Technologie des produits forestiers bois propriété technologique propriété mécanique Élasticité propriété physicochimique classement modèle mathématique Abies alba Pseudotsuga menziesii Pinus nigra Castanea sativa expérimentation http://aims.fao.org/aos/agrovoc/c_8421 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_4683 http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_1521 http://aims.fao.org/aos/agrovoc/c_3341 http://aims.fao.org/aos/agrovoc/c_24199 http://aims.fao.org/aos/agrovoc/c_11 http://aims.fao.org/aos/agrovoc/c_6312 http://aims.fao.org/aos/agrovoc/c_5901 http://aims.fao.org/aos/agrovoc/c_1371 http://aims.fao.org/aos/agrovoc/c_2758 Italie http://aims.fao.org/aos/agrovoc/c_4026 The study analyses the relationship between local and global modulus of elasticity and develops and evaluates different models to predict local from global modulus measurements. The mechanical tests were performed on four species commonly used in Italy for structural purposes: fir, Douglas-fir, Corsican pine and chestnut. Two or three cross-sections and two provenances were sampled for each species. A theoretical analysis showed that the local-global modulus relationship was of polynomial form with only one coefficient. The effect of the species on the relationship was significant as well as the cross-section but only for softwoods. The effect of the cross-section was explained by the presence and the size of defects in the mid span. The different models were applied and then compared by means of the optimum grading: only slight differences among models emerged. Although optimum grading was strongly dependent on the sampling and on the grade combination, for softwoods the model for species and section showed very similar results to the grading with the true local modulus; inclusion of the knot values in the model led to only slight improvements. For chestnut all models were found to be comparable. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/568680/1/document_568680.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1007/s00107-013-0682-7 10.1007/s00107-013-0682-7 info:eu-repo/semantics/altIdentifier/doi/10.1007/s00107-013-0682-7 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1007/s00107-013-0682-7 |
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K50 - Technologie des produits forestiers bois propriété technologique propriété mécanique Élasticité propriété physicochimique classement modèle mathématique Abies alba Pseudotsuga menziesii Pinus nigra Castanea sativa expérimentation http://aims.fao.org/aos/agrovoc/c_8421 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_4683 http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_1521 http://aims.fao.org/aos/agrovoc/c_3341 http://aims.fao.org/aos/agrovoc/c_24199 http://aims.fao.org/aos/agrovoc/c_11 http://aims.fao.org/aos/agrovoc/c_6312 http://aims.fao.org/aos/agrovoc/c_5901 http://aims.fao.org/aos/agrovoc/c_1371 http://aims.fao.org/aos/agrovoc/c_2758 http://aims.fao.org/aos/agrovoc/c_4026 K50 - Technologie des produits forestiers bois propriété technologique propriété mécanique Élasticité propriété physicochimique classement modèle mathématique Abies alba Pseudotsuga menziesii Pinus nigra Castanea sativa expérimentation http://aims.fao.org/aos/agrovoc/c_8421 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_4683 http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_1521 http://aims.fao.org/aos/agrovoc/c_3341 http://aims.fao.org/aos/agrovoc/c_24199 http://aims.fao.org/aos/agrovoc/c_11 http://aims.fao.org/aos/agrovoc/c_6312 http://aims.fao.org/aos/agrovoc/c_5901 http://aims.fao.org/aos/agrovoc/c_1371 http://aims.fao.org/aos/agrovoc/c_2758 http://aims.fao.org/aos/agrovoc/c_4026 |
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K50 - Technologie des produits forestiers bois propriété technologique propriété mécanique Élasticité propriété physicochimique classement modèle mathématique Abies alba Pseudotsuga menziesii Pinus nigra Castanea sativa expérimentation http://aims.fao.org/aos/agrovoc/c_8421 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_4683 http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_1521 http://aims.fao.org/aos/agrovoc/c_3341 http://aims.fao.org/aos/agrovoc/c_24199 http://aims.fao.org/aos/agrovoc/c_11 http://aims.fao.org/aos/agrovoc/c_6312 http://aims.fao.org/aos/agrovoc/c_5901 http://aims.fao.org/aos/agrovoc/c_1371 http://aims.fao.org/aos/agrovoc/c_2758 http://aims.fao.org/aos/agrovoc/c_4026 K50 - Technologie des produits forestiers bois propriété technologique propriété mécanique Élasticité propriété physicochimique classement modèle mathématique Abies alba Pseudotsuga menziesii Pinus nigra Castanea sativa expérimentation http://aims.fao.org/aos/agrovoc/c_8421 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_4683 http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_1521 http://aims.fao.org/aos/agrovoc/c_3341 http://aims.fao.org/aos/agrovoc/c_24199 http://aims.fao.org/aos/agrovoc/c_11 http://aims.fao.org/aos/agrovoc/c_6312 http://aims.fao.org/aos/agrovoc/c_5901 http://aims.fao.org/aos/agrovoc/c_1371 http://aims.fao.org/aos/agrovoc/c_2758 http://aims.fao.org/aos/agrovoc/c_4026 Nocetti, Michela Brancheriau, Loïc Bacher, Martin Brunetti, Michèle Crivellaro, Alan Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading |
description |
The study analyses the relationship between local and global modulus of elasticity and develops and evaluates different models to predict local from global modulus measurements. The mechanical tests were performed on four species commonly used in Italy for structural purposes: fir, Douglas-fir, Corsican pine and chestnut. Two or three cross-sections and two provenances were sampled for each species. A theoretical analysis showed that the local-global modulus relationship was of polynomial form with only one coefficient. The effect of the species on the relationship was significant as well as the cross-section but only for softwoods. The effect of the cross-section was explained by the presence and the size of defects in the mid span. The different models were applied and then compared by means of the optimum grading: only slight differences among models emerged. Although optimum grading was strongly dependent on the sampling and on the grade combination, for softwoods the model for species and section showed very similar results to the grading with the true local modulus; inclusion of the knot values in the model led to only slight improvements. For chestnut all models were found to be comparable. |
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article |
topic_facet |
K50 - Technologie des produits forestiers bois propriété technologique propriété mécanique Élasticité propriété physicochimique classement modèle mathématique Abies alba Pseudotsuga menziesii Pinus nigra Castanea sativa expérimentation http://aims.fao.org/aos/agrovoc/c_8421 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_4683 http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_1521 http://aims.fao.org/aos/agrovoc/c_3341 http://aims.fao.org/aos/agrovoc/c_24199 http://aims.fao.org/aos/agrovoc/c_11 http://aims.fao.org/aos/agrovoc/c_6312 http://aims.fao.org/aos/agrovoc/c_5901 http://aims.fao.org/aos/agrovoc/c_1371 http://aims.fao.org/aos/agrovoc/c_2758 http://aims.fao.org/aos/agrovoc/c_4026 |
author |
Nocetti, Michela Brancheriau, Loïc Bacher, Martin Brunetti, Michèle Crivellaro, Alan |
author_facet |
Nocetti, Michela Brancheriau, Loïc Bacher, Martin Brunetti, Michèle Crivellaro, Alan |
author_sort |
Nocetti, Michela |
title |
Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading |
title_short |
Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading |
title_full |
Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading |
title_fullStr |
Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading |
title_full_unstemmed |
Relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading |
title_sort |
relationship between local and global modulus of elasticity in bending and its consequence on structural timber grading |
url |
http://agritrop.cirad.fr/568680/ http://agritrop.cirad.fr/568680/1/document_568680.pdf |
work_keys_str_mv |
AT nocettimichela relationshipbetweenlocalandglobalmodulusofelasticityinbendinganditsconsequenceonstructuraltimbergrading AT brancheriauloic relationshipbetweenlocalandglobalmodulusofelasticityinbendinganditsconsequenceonstructuraltimbergrading AT bachermartin relationshipbetweenlocalandglobalmodulusofelasticityinbendinganditsconsequenceonstructuraltimbergrading AT brunettimichele relationshipbetweenlocalandglobalmodulusofelasticityinbendinganditsconsequenceonstructuraltimbergrading AT crivellaroalan relationshipbetweenlocalandglobalmodulusofelasticityinbendinganditsconsequenceonstructuraltimbergrading |
_version_ |
1792498435910270976 |