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

Zangiácomo, André Luiz; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.5935/1809-2667.20130006

Cited by 4 publications

(1 citation statement)

References 7 publications

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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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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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Ultrasound grading of round Eucalyptus timber using the Brazilian standard

et al. 2018

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Evolution of Acoustical, Geometrical, Physical, and Mechanical Parameters from Seedling to Cutting Age in Eucalyptus Clones Used in the Pulp and Paper Industries in Brazil

Gonçalves¹,

Lorensani²,

Ruy³

et al. 2019

Forest Products Journal

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Wood-processing industries must be able to estimate the properties of wood to properly manage the wood production chain. For this estimation, changes in certain characteristics over time must be identified so that they can be used to rapidly differentiate a clone or species. Of interest are acoustical, geometrical, physical, and mechanical properties, all measurable in seedlings. Thus, the objective of this research was to analyze the evolution of the ultrasonic wave propagation velocity, diameter, height, basic density, strength, and stiffness starting in nursery seedlings at 3 months of age to trees at 6 years of age, which is the cutting age used by the pulp and paper industry in Brazil. The experiment was conducted in 121 seedlings and 270 trees of three Eucalyptus clones. Within the age range analyzed, the results indicated that all parameters have the potential to be used in a predictive model to estimate the future quality of clones, although the predictive value of these parameters varies. The ultrasonic wave propagation velocity was the only property that maintained the coherent differences among clones from the seedling to the cutting age (6 yr old). The strength, stiffness, diameter, and height maintained coherence from 12 months to the cutting age, whereas the basic density was maintained from the age of 24 months to the cutting age. We hope that these results will contribute to improving the methods to select clones.

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

Cited by 4 publications

References 7 publications

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

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

Ultrasound grading of round Eucalyptus timber using the Brazilian standard

Evolution of Acoustical, Geometrical, Physical, and Mechanical Parameters from Seedling to Cutting Age in Eucalyptus Clones Used in the Pulp and Paper Industries in Brazil

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