Characterisation and statistical modelling of shear strength in 12 hardwood timber species from the Congo Basin
Shear strength is a wood property that is fundamental to the design of wood-based products and constructions. This property cannot currently be predicted due to insuf- ficient knowledge, primarily because of the large number of timber species found in the Congo Basin. The main aim of this study was to provide a preliminary qualification of shearing in Congo Basin timber species, with consideration for its variability. For this purpose, we studied 12 timber species with very different properties, from the least dense to the densest. Their shear strength was determined experimentally using Euro- pean standard specifications, on the scale of the wood material used. A statistical ana- lysis was conducted. To reduce shear stren- gth variability, the species were assigned to four distinct clusters defined according to FCBA Institute specifications. With a view to developing allowable design stresses to facilitate decision-making, we evaluated the relative goodness-of-fit of five probabi- listic shear strength distributions (normal, lognormal, exponential, Weibull 2 parame- ters and Weibull 3 parameters) that are used in wood-related applications. The results of geometric regression (R2 = 0.81) show that shear strength is well correlated with den- sity. Shear strength can be more reliably predicted with the three-parameter Wei- bull distribution than with the other dis- tributions. The findings of this study open up new prospects to be considered for the design of wood-based products with regard to shear, when using tropical timber species from the Congo Basin.
| Main Authors: | , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Published: |
CIRAD
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| Subjects: | bois, bois de charpente, propriété du bois, propriété technologique, propriété physicochimique, résistance au cisaillement, préservation du bois, propriété mécanique, cisaillement, cisaille, http://aims.fao.org/aos/agrovoc/c_8421, http://aims.fao.org/aos/agrovoc/c_28158, http://aims.fao.org/aos/agrovoc/c_34363, http://aims.fao.org/aos/agrovoc/c_2572, http://aims.fao.org/aos/agrovoc/c_1521, http://aims.fao.org/aos/agrovoc/c_9d2ec51c, http://aims.fao.org/aos/agrovoc/c_8428, http://aims.fao.org/aos/agrovoc/c_4683, http://aims.fao.org/aos/agrovoc/c_6c80a093, http://aims.fao.org/aos/agrovoc/c_7029, http://aims.fao.org/aos/agrovoc/c_1811, http://aims.fao.org/aos/agrovoc/c_1229, |
| Online Access: | http://agritrop.cirad.fr/611001/ http://agritrop.cirad.fr/611001/1/2024%20BFT360%20Ndiapi%20Cisaillement.pdf |
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| Summary: | Shear strength is a wood property that is fundamental to the design of wood-based products and constructions. This property cannot currently be predicted due to insuf- ficient knowledge, primarily because of the large number of timber species found in the Congo Basin. The main aim of this study was to provide a preliminary qualification of shearing in Congo Basin timber species, with consideration for its variability. For this purpose, we studied 12 timber species with very different properties, from the least dense to the densest. Their shear strength was determined experimentally using Euro- pean standard specifications, on the scale of the wood material used. A statistical ana- lysis was conducted. To reduce shear stren- gth variability, the species were assigned to four distinct clusters defined according to FCBA Institute specifications. With a view to developing allowable design stresses to facilitate decision-making, we evaluated the relative goodness-of-fit of five probabi- listic shear strength distributions (normal, lognormal, exponential, Weibull 2 parame- ters and Weibull 3 parameters) that are used in wood-related applications. The results of geometric regression (R2 = 0.81) show that shear strength is well correlated with den- sity. Shear strength can be more reliably predicted with the three-parameter Wei- bull distribution than with the other dis- tributions. The findings of this study open up new prospects to be considered for the design of wood-based products with regard to shear, when using tropical timber species from the Congo Basin. |
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