WOOD RESEARCH Volume 67, Number 2, 2022
Vinicius Borges De Moura Aquino, LARISSA SORIANI ZANINI RIBEIRO SOARES, HELOIZA CANDEIA RUTHES, Felipe Nascimento Arroyo, IURI FAZOLIN FRAGA, ANDRÉ LUIS CHRISTOFORO, Herisson Ferreira dos Santos, Eduardo Chahud, Luiz Antonio Melgaço Nunes Branco, and Francisco Antonio Rocco Lahr

Analysis of moisture content variation on strength and stiffness properties of cedrella odorata wood species

In order to analyze the influence of moisture content variation on Cedrella odorata wood specie on strength and stiffness properties, considering 12% moisture content up to fiber saturation point (FSP). Most of strength and stiffness properties analyzed were significantly influenced by moisture content according statistical analysis. ANOVA, Anderson Darling and Multiple comparison tests were used at 5% significance level. Considering that most of properties were affected by moisture content, the equations to estimate wood properties according moisture decrease are quite precise, but most of estimations were higher than experimental values at 12% moisture content, indicating the need of a standard review for such estimators, which may lead to an unsafe timber structure design.

WOOD RESEARCH Volume 66, Number 5, 2021
Francisco Antonio Rocco Lahr, Eduardo Chahud, Felipe Nascimento Arroyo, André Luis Christoforo, Edson Fernando Castanheira Rodrigues, João Paulo Boff Almeida, Vinicius Borges De Moura Aquino, and Herisson Ferreira dos Santos

Ratio analysis between compression and shearing of 72 Brazilian wood species

The Brazilian standard ABNT NBR 7190 (1997) governs the premises for the wood structure sizing through a table and the simplified method. Thus, this research aims to analyze whether the simplified method shown in the standard matches the resistance values of 72 Brazilian species, separated from class C20 to C60. In the end, it was possible to conclude that the value displayed by the standard between the ratio of shear and compression in the direction parallel to the fibers is half of what actually happens in Brazilian species, showing an urgent review in the standard premises.

WOOD RESEARCH Volume 66, Number 4, 2021
Francisco Antonio Rocco Lahr, Vinicius Borges De Moura Aquino, Felipe Nascimento Arroyo, Herisson Ferreira dos Santos, Sergio Augusto Mello Silva, Anderson Renato Vobornik Wolenski, Carlos Maviael de Carvalho, João Paulo Boff Almeida, and André Luis Christoforo

Influence of stiffness related to the C40 strength class of the hardwood group established by the Brazilian standard in the design of timber structures

The Brazilian standard ABNT 7190 (1997) establishes the strength classes C20, C30, C40 and C60 for the proper framework of the different wood types in the group of hardwoods. Associated with the strength class, which is based on the compressive strength characteristic value parallel to the fibers (fc0,k), the standard stipulates the respective values representing the stiffness (Ec0), with 19500 MPa being the reference value for the class C40, essential variables in structural design. For being the C40 class is the one with the greatest amplitude (20 MPa), it is possible that the value 19500 MPa is not the best representation of stiffness. This work aimed to verify the representativeness the stiffness value established by the Brazilian standard for C40 wood. The result obtained from the average confidence interval indicates the value of 14110 MPa as being the most representative, which may imply structures that are supposedly more rigid than they really are.

WOOD RESEARCH Volume 66, Number 2, 2021
Vinicius Borges De Moura Aquino, Marcus Vinicius Pereira De Freitas, Claudia Queiroz De Vasconcelos, João Paulo Boff Almeida, Felipe Nascimento Arroyo, Edson Fernando Castanheira Rodrigues, André Luis Christoforo, Diego Henrique De Almeida, Sergio Augusto Mello Silva, Diogo Aparecido Lopes Silva, Roberto Vasconcelos Pinheiro, and Francisco Antonio Rocco Lahr

Physical and mechanical characterization of Planchonella Pachycarpa wood species for use in structural purpose

This research aimed to characterize the wood species Goiabão (Planchonella pachycarpa), following the precepts set forth in the Brazilian standard ABNT NBR 7190, as well as to evaluate the possibility of estimating physical and mechanical properties, using the analysis of variance (ANOVA) as a function of apparent density, and also to estimate the stiffness properties as a function of the respective strength property. The physical and mechanical properties were considered adequate for the use of this wood for structural purposes, being classified in class C40. According to the results of the regression models, it is possible to estimate the tensile strength parallel to the fibers as a function of the apparent density. It was also possible to estimate the longitudinal elastic modulus in the compression parallel to the fibers as a function of the compressive strength parallel to the fibers.