AVALIAÇÃO NUMÉRICA DO MÓDULO DE ELASTICIDADE EM VIGAS ROLIÇAS DE MADEIRA DA ESPÉCIE &lt;i&gt;Pinus elliottii&lt;/i&gt;

Christofóro, André Luis; Panzera, Túlio Hallak; Silveira, Márcio Eduardo; Silva, Diogo Aparecido Lopes; Pinheiro, Roberto Vasconcelos; Lahr, Francisco Antônio Rocco

doi:10.5902/1980509825138

Cited by 3 publications

(2 citation statements)

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“…This fact, associated with the natural strength capacity of wood (Lahr et al, 2016), leads to an increase in the construction of slender elements. These elements are associated with lower consumption of materials and have several structural applications (Zangiácomo et al, 2014;Christoforo et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Timber Elastic Modulus on the Geometric Nonlinear Structural Analysis of Truss Arches

et al. 2022

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In this work, it was numerically evaluated the influence of the modulus of elasticity parallel to the wood grain on the stability of trussed arches considering a nonlinear geometric analysis based on the Finite Element Method (FEM). This approach was carried out according to a positional formulation of the FEM, considering the structural nodes as main variables of the nonlinear equations system, whose resolution was obtained using the Newton-Raphson method. Altogether, seven arch models were evaluated, consisting of coniferous and hardwoods, with properties defined according to the strength classes of the Brazilian standard ABNT NBR 7190. The subroutines were written in MATLAB to solve the system of nonlinear equations and perform the analysis, including the graphical representation of the results and configurations of the trussed arch. Internal loads and displacements were obtained, in addition to the instability loads of the trussed arches. It was found that the instability load of the arch made with the stiffest hardwood (D60) was approximately equal to 700% of the instability load of the C20 coniferous class and equivalent to 257.8% of the D20 hardwood class-related load. It was verified that the modulus of elasticity significantly influences the nonlinear geometric behavior of the timber trussed arch. Furthermore, the nonlinear geometric analysis allowed calculating more accurate parameters and the verification of the stability of the structural system.

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Section: Introductionmentioning

confidence: 99%

Influence of the Timber Elastic Modulus on the Geometric Nonlinear Structural Analysis of Truss Arches

et al. 2022

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“…The natural round wood is an excellent solution because it does not require wood processing [8][9][10][11][12][13][14], commonly used in structural projects, such as bridges, in which concrete can also be used in conjunction with wood [15], consisting of steel bars and resins as the joining elements between wood and concrete materials.…”

Section: Introductionmentioning

confidence: 99%

Pull out Strength Evaluation of Steel Bars Bonded-in to 45° in Round Timbers of Corymbia citriodora Treated with CCA

Pigozzo¹,

Arroyo²,

Christofóro³

et al. 2017

ijme

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With the possibility of developing simple connections, of easy execution, strong and durable, the bonded-in steel bars with structural resins have started being applied to different situations, such as shear connectors in mixed wood-concrete structures. These connectors, when steel bars are inclined in relation to the grain, may work under axial forces transmitting more stiffness and strength to the connection. In this research, the pull out strength of bonded-in steel bars was evaluated, bent 45° in relation to wood grain, using epoxy resin Sikadur-32 Fluid. In random sample of round pieces of Eucalyptus citriodora (Corymbia citriodora), CCA treated, with six replications in each observation, and considering the variability of the parameters: natural wood mechanical properties; apparent density; bar diameters; adherence surface and the moisture content. Steel bars used were highly resistant ones (CA-50), with threaded surface solicited by axial force, under monotonic loadings, with two consecutive load cycles. From the analysis of variance (ANOVA), the increase in the moisture content promoted reductions in the values of the compressive strength. The estimate of the pullout strength by the multivariable regression model, the moisture content was considered not significant, increases in the area of anchoring strengths implied significant increases in anchorage strength values, and the interaction between the factors (anchoring area and moisture content) promoted reductions in the anchor strength values of the steel bars.

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Determinación experimental y verificación por el método del elemento finito de la frecuencia natural de vibración de barras de madera

Sotomayor-Castellanos

López-Garza

2019

IyCUAA

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El método del elemento finito se ha utilizado de manera extensiva en la caracterización mecánica de la madera. El objetivo de la investigación fuedeterminar de manera experimental y verificar numéricamente la frecuencia natural en vibraciones transversales de pequeñas barras de 12 maderas. Se determinaron experimentalmente la densidad, la frecuencia de vibración y el módulo dinámico. Además, se estimó numéricamente la frecuencia correspondiente a los parámetros materiales determinados experimentalmente. El uso del módulo dinámico obtenido experimentalmente y empleado en las simulaciones conduce a valoresde frecuencia equivalentes a los obtenidos en las pruebas de vibraciones, probando así la eficiencia del modelado numérico para estimar la frecuencia de una pieza de madera. Además, la correlación entre la frecuencia numérica y la frecuencia experimental explica 66% de esta dependencia. Así, la regresión lineal calculada indica una buena calidad predictiva del modelo de simulación empleado en la investigación.

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AVALIAÇÃO NUMÉRICA DO MÓDULO DE ELASTICIDADE EM VIGAS ROLIÇAS DE MADEIRA DA ESPÉCIE <i>Pinus elliottii</i>

Cited by 3 publications

References 0 publications

Influence of the Timber Elastic Modulus on the Geometric Nonlinear Structural Analysis of Truss Arches

Influence of the Timber Elastic Modulus on the Geometric Nonlinear Structural Analysis of Truss Arches

Pull out Strength Evaluation of Steel Bars Bonded-in to 45° in Round Timbers of Corymbia citriodora Treated with CCA

Determinación experimental y verificación por el método del elemento finito de la frecuencia natural de vibración de barras de madera

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