Classification for wood of Pinus sp. clear specimens from growth rings

Name: AUGUSTO MELO MOULIN BREDA

Publication date: 25/02/2022
Advisor:

Name	Role
FABRICIO GOMES GONÇALVES	Co-advisor *
PEDRO GUTEMBERG DE ALCÂNTARA SEGUNDINHO	Advisor *

Examining board:

Name	Role
JUAREZ BENIGNO PAES	Internal Examiner *
PEDRO GUTEMBERG DE ALCÂNTARA SEGUNDINHO	Advisor *

Summary: The Brazilian Standard (NBR) for Design of Wood Structures must consider for the mechanical classification and for the design of wood structures the association between physical-mechanical properties and the characteristics of the growth rings of Pinus sp. The characteristics of the growth rings are essential variables to estimate physical-mechanical properties of wood. Therefore, the objective of this dissertation is to evaluate the relationship between growth rings and physical-mechanical properties of clear specimens wood of Pinus sp. Non-destructive tests of longitudinal and transversal vibrations, stress wave, static bending, determination of basic and apparent densities, and destructive rupture test were performed. In addition, latewood width, latewood proportion, and number of growth rings were obtained. Pearson s correlation matrix was used to analyze the associations between physicalmechanical properties and growth rings characteristics’. Pearson’s r coefficients were all significant (p<0,05). Thus, it is concluded that the latewood width of the growth rings explained 62% of the basic density and 60% of the apparent density, but only 18% of the static bending. Therefore, the joint evaluation of growth rings characteristics and physical-mechanical properties enabled the mechanical characterization of Pinus sp. from growth rings.

Palavras-chave: Apparent density, Static bending, Latewood, Correlation matrix, Modulus of elasticity.

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