Influence of Displacements on Calculus of the Longitudinal Modulus of Elasticity of <i>Pinus Caribaea</i> Structural Round Timber Beams

Abstract

Round timber shows great potential for use as a building material, having the advantage of not being processed, such as the sawn wood. In Brazil, the normative standards that deal with the existing round timber elements are mainly headed for the pole market, being in force for at least twenty years without technical review, recommending characterization of this material by destructive methods, using small specimens with no defects and a cantilever beam structural model [2]. This paper aims to determine the longitudinal modulus of elasticity of Pinus caribaea structural round timber beams using static three-point bending test under physical and geometrical linearity conditions (non-destructive methodology) which evaluates the effect of the L/200 and L/300 displacement measurements for this purpose [6]. The results achieved by the confidence interval show the statistical equivalence between the values of the modulus of elasticity, being possible in this case, the use of both limits in displacement measurements.

Módulos de elasticidade longitudinal e transversal em vigas roliças de madeira de Corymbia citriodora

“…As pesquisas que envolvem a caracterização de peças de madeira de dimensões estruturais no Brasil seguem as premissas de métodos e cálculos contidos em documentos normativos internacionais ou da adaptação da norma brasileira ABNT NBR 1790:1197 para peças estruturais, podendo-se citar os trabalhos de Pigozzo et al (2000), Fiorelli et al (2009), Miotto e Dias (2009), Carreira et al (2010), Brito e Calil Jr. (2010), Christoforo et al (2012).…”

Verification of Test Conditions to Determine the Compression Modulus of Elasticity of Wood

“…The wood itself as one of the oldest building materials, being used mainly because of its availability in nature, ease of handling, manufacturing and excellent relationship weight/strength [1][2][3].…”

“…According to [1], the mechanical properties of wood are dependent on the density, the percentage of juvenile wood, the width of the rings, the angle of the microfibrils, the amount of extract ives, moisture content, the intensity of insect attack, the type and location and number of nodes, among other factors, making it difficult to obtain need all their elastic parameters to be used in structural projects [8,9].…”

Influence of the Wood Specimen Position on Calculus of the Bending Modulus of Elasticity

“…The wood is one of the oldest building materials, being used main ly because of its availability in nature, ease of handling, manufacturing and excellent weight/strength relationship [1][2][3].…”

“…According to [1], the mechanical properties of wood are dependent on the density, percentage of juvenile wood, the width of the rings, the angle of the micro fibrils, the amount of extractives, moisture content, the intensity of insect attack, the type and location and number of nodes, among other factors, making it difficult to obtain all their elastic parameters to be used in structural projects [8,9].…”