Estimation of Modulus of Elasticity in Static Bending of Wood in Structural Dimensions as a Function of Longitudinal Vibration and Density
Raquel Schmitt Cavalheiro
Department of Science and Materials Engineering, University of São Paulo, Av. Trabalhador São-Carlense 400, São Carlos - SP, 13566-590, Brazil.
Diego Henrique de Almeida *
Department of Civil Engineering, Federal University of São Carlos, Rodovia Washington Luís, km 235 - SP310, São Carlos - SP, 13565-905, Brazil.
Tiago Hendrigo de Almeida
Department of Science and Materials Engineering, University of São Paulo, Av. Trabalhador São-Carlense 400, São Carlos - SP, 13566-590, Brazil.
André Luis Christoforo
Department of Civil Engineering, Federal University of São Carlos, Rodovia Washington Luís, km 235 - SP310, São Carlos - SP, 13565-905, Brazil.
Francisco Antonio Rocco Lahr
Department of Structures, University of São Paulo, Av. Trabalhador São-Carlense 400, São Carlos - SP, 13566-590, Brazil.
*Author to whom correspondence should be addressed.
Abstract
In order to use wood in a sustainable and rational way, it is necessary to estimate its characteristics, and in the case of civil construction, the physical and mechanical properties are the most interesting. The aim of this research was to estimate the modulus of elasticity of structural pieces of Schizolobium amazonicum Herb. wood through static bending (MOEsb) and longitudinal vibration (MOElv) methods, in addition, to generate regression models to estimate the modulus of elasticity of static bending. Tests for MOEsb and MOElv estimation were carried out according to ABNT NBR 7190:1997 and FAKOPP Enterprise, respectively. Linear and quadratic regression models were used to estimate MOEsb as a function of MOElv. A multivariate regression model was also generated considering the wood density. According to the discussion of the obtained results, MOElv and MOEsb average values estimated for the studied batch of Schizolobium amazonicum Herb. wood were 9.70 and 9.07 GPa, and average density 381.21 kg/m3. Regression models proposed for estimation of MOEsb presented the coefficient of determination close to 60%.
Keywords: Mechanical properties, modulus of elasticity, wood, wood structures