Density as Estimator of Shrinkage for Some Brazilian Wood Species

Cavalheiro, Raquel Schmitt; Almeida, Diego Henrique de; Almeida, Tiago Hendrigo de; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.5923/j.ijme.20160603.08

Cited by 17 publications

(14 citation statements)

References 5 publications

(6 reference statements)

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“…Other work in the scientific literature evidenced a varied behavior (representative or not) of the use of density as an estimator of physical and mechanical properties, in the works [1] and [6], significant results were obtained in the estimation of wood tenacity as a function of apparent density, which can not be observed in [4] and [5].…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Potential Use of Oiticica-Amarela Wood for Structural Applications

Rodrigues¹,

Christofóro²

2019

ijme

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In relation to other materials such as concrete, plastic, steel and aluminum, wood has a number of advantages, such as beauty, high mechanical resistance to mass, good thermal insulation and easy workability. Still, wood presents environmental advantages when compared to other building materials (cement, concrete, steel and aluminum), beause it is recyclable, renewable, biodegradable and requires low energy needs for its processing. Taking so many advantages of the wooden use, it's necessary to aim a rational use for this raw material, as an example, there are the physical and mechanical properties, which are important for the structural use of the species in the design of wood structures. This work aimed to characterize the wood species Clarisia racemosa (Oiticica-Amarela), objectifying its viable use for structural purposes. The tests to obtain the physical and mechanical properties were carried out according to the recommended established by Brazilian Standard ABNT NBR 7190 (1997), allowing the classification of such species in strength class C60 (hardwoods), as well as evaluating the possibility of estimation (linear, exponential, geometric and logarithmic models) of the physical and mechanical properties in function of the apparent density. The results obtained from the regression models implied the possibility of estimating only the mechanical property of compressive strength parallel to the fibers (f c0 ) as a function of the apparent density (ρ ap, 12% ).

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Section: Resultsmentioning

confidence: 99%

Evaluation of the Potential Use of Oiticica-Amarela Wood for Structural Applications

Rodrigues¹,

Christofóro²

2019

ijme

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“…Wood, a natural and renewable source material, has a good relationship between mechanical strength and density (Arruda et al, 2015;Baar et al, 2015;Cavalheiro et al, 2016), which makes it suitable for use in rural and civil constructions (Andrade Jr et al, 2014;Chen & Guo, 2017.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Characteristic Value of Wood Strength

et al. 2019

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For safety reasons, wood strength values, essential for structural dimensioning, are calculated based on the characteristic value, which corresponds to the 5% percentile of a given probability distribution model. For small samples, the Brazilian normative document ABNT NBR 7190 establishes an estimator of the characteristic wood strength, which can provide a significantly different result from the characteristic value coming from a suitable model of probability distribution. The main objective of this study was to evaluate the best probability distribution model (normal, lognormal, Weibull, and exponential) and the subsequent calculation of the characteristic value indicated by ABNT NBR 7190 (1997), allowing to evaluate its accuracy, being also investigated two relationships between characteristic values of the simplified characterization condition for woods of species already known. The best adhesion model was the normal model, which resulted in values statistically equivalent to the characteristic values according to ABNT NBR 7190 (1997). Among the evaluated relationships, the obtained results were significantly higher (up to 92%) when compared to those estimated by ABNT NBR 7190 (1997).

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“…The high demand for wood by the various sectors of the industry led to selective and predatory extraction of species known to the construction market, thus leading to an increase in prices of these wood species. Thus, it is necessary to characterize and evaluate new wood species for structural use (Lahr et al, 2016a;Cavalheiro et al, 2016;Silva et al, 2018). The use of wood species Peltophorum vogelianum Benth.…”

Section: Introductionmentioning

confidence: 99%

EVALUATION OF THE Peltophorum vogelianum Benth. WOOD SPECIES FOR STRUCTURAL USE

et al. 2019

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Wood is a material used for various purposes since ancient times and is mainly used in civil and rural construction and industry. Due to the predatory exploitation of known trees, it is necessary to characterize new species for use in urban and rural structures as alternatives of species commonly used. This study aimed to determine the physical and mechanical properties of Guarucaia wood (Peltophorum vogelianum Benth.) based on the Brazilian standard ABNT NBR 7190 (1997) and estimate the strength and stiffness as a function of apparent density using the analysis of variance and also estimate stiffness as a function of its strength. The mechanical properties of P. vogelianum were considered compatible for structural use when compared with others used for the same purpose, being classified in the class C50 of dicotyledon species and evidencing the possibility of its use for structural purposes. According to the results of the poor quality in the fit of regression models in the statistical analysis, the strength and stiffness could not be estimated as a function of apparent density nor stiffness properties as a function of their respective strengths.

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Density as Estimator of Shrinkage for Some Brazilian Wood Species

Cited by 17 publications

References 5 publications

Evaluation of the Potential Use of Oiticica-Amarela Wood for Structural Applications

Evaluation of the Potential Use of Oiticica-Amarela Wood for Structural Applications

Estimation of the Characteristic Value of Wood Strength

EVALUATION OF THE Peltophorum vogelianum Benth. WOOD SPECIES FOR STRUCTURAL USE

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