Analytical study of the dimensional stability of tropical brazilian wood species

Authors

DOI:

https://doi.org/10.5902/1980509865389

Keywords:

Longitudinal shrinkage, Tangential shrinkage, Tropical Brazilian wood

Abstract

Brazil owns a large vegetal covering and the best utilization of these materials requires physical and mechanical characterization procedures. Equations found in the literature make easier the wood properties determination. At this context, well known authors developed the equation βl = βt/23, being βl and βt the longitudinal and tangential shrinkage percentages, for βl estimation based on the βt value specially for wood species from the Northern hemisphere. This paper aims to investigate the accuracy of this equation for fifteen tropical Brazilian wood species covering the entire range of hardwood strength classes according to the Brazilian Normative ABNT NBR7190. The average experimental values of βl and βt were 7.71% (CV = 26,71%) and 0.73% (CV = 38,76%), respectively. The non-parametric Kruskal-Wallis ANOVA refuted the hypothesis of equivalence between theoretical and experimental βl values (p-value = 0.0000). A linear regression model fitted to experimental values provided βl = βt/9,84 as optimal solution (p-value = 0.0000, R2 = 47,23%). According to results it is possible to conclude that the value of longitudinal shrinkage percentage of tropical Brazilian wood species is statistically 2,34 times greater than the value found in the literature, which impacts the design of timber structures procedures increasing the internal stresses in timber structural elements.

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Author Biographies

Tiago Hendrigo Almeida, University of São Paulo

Ph.D in Materials Science
Universidade de São Paulo, São Carlos, SP, Brazil.

Diego Henrique Almeida, Universidade Federal de Rondônia

Ph.D in Civil Engineering
Universidade Federal de Rondônia, Porto Velho, RO, Brazil.

Vinicius Borges de Moura Aquino, Universidade Estadual Paulista

Ph.D in Civil Engineering
Universidade Estadual Paulista, Ilha Solteira, SP, Brazil.

André Luis Christoforo, Universidade Federal de São Carlos

Ph.D in Structures Engineering
Universidade Federal de São Carlos, São Carlos, SP, Brazil.

Francisco Antonio Rocco Lahr, University of São Paulo

Ph.D in Structures Engineering
Universidade de São Paulo, São Carlos, SP, Brazil.

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Published

2023-03-28

How to Cite

Almeida, T. H., Almeida, D. H., Aquino, V. B. de M., Christoforo, A. L., & Lahr, F. A. R. (2023). Analytical study of the dimensional stability of tropical brazilian wood species. Ciência Florestal, 33(1), e65389. https://doi.org/10.5902/1980509865389

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Vol. 33 No. 1 (2023): Publicação Contínua

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