Evaluation of mechanical strengths of tropical hardwoods: proposal of probabilistic models

Wolenski, Anderson Renato Vobornik; Peixoto, Rodrigo Guerra; Aquino, Vinícius Borges de Moura; Christofóro, André Luis; Lahr, Francisco Antônio Rocco; Panzera, Túlio Hallak

doi:10.1007/s00107-020-01521-0

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…The apparent density is a property that is easily determined experimentally, defined by the ratio between the mass and the volume of the sample at 12% humidity, as indicated in the 1997 standard, ABNT NBR 7190 (Pigozzo et al 2018c). Thus, the estimation of other wood properties with just one simple test is extremely valuable (Almeida et al 2019;Wolenski et al 2020;Almeida et al 2020), allowing the engineer to carry out structural design easily and effectively (Lahr et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Models to estimate longitudinal compressive strength of Brazilian hardwood based on apparent density

Lahr

Arroyo

Rodrigues

et al. 2021

BioRes

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As wood is an orthotropic and natural material, there are several properties required for its use in civil construction. The apparent density has been used to estimate physical and mechanical properties of wood, as it is easy to determine experimentally, unlike other determinations, which involve the use of equipment available only in large research centers. Using the Brazilian standard ABNT NBR 7190 and linear and non-linear regression models, this research aimed to evaluate their accuracy in estimating the compressive strength parallel to the fibers (fc0) as well as their characteristic value (fc0,k). This study considered 72 tropical wood species from native forests that were divided into the 4 strength classes of this standard. For the set formed by all species, the linear polynomial model was the best fit, resulting in a determination coefficient of just over 70%.

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Section: Introductionmentioning

confidence: 99%

Models to estimate longitudinal compressive strength of Brazilian hardwood based on apparent density

Lahr

Arroyo

Rodrigues

et al. 2021

BioRes

Self Cite

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“…Woody species and materials are numerous as confirmed by De Araujo et al [16,17], Knauf [18], and Gouveia et al [19]. Hardwoods are efficient for structural ends, as proved by Wolenski et al [20] and Marcolin et al [21]. Hence, wood has been widely studied, and the main topics include new products and composites, chemistry and physical-mechanical evaluation for construction applications [22].…”

Section: Timber Construction and The Demand About Its Electronic Marketmentioning

confidence: 93%

Is the Timber Construction Sector Prepared for E-Commerce via Instagram®? A Perspective from Brazil

et al. 2022

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Timber construction is a contemporary solution where sales are performed through in-store trade. Timber house e-commerce may stimulate global markets, and in times of intense remote routines, it is useful to improve the performance of the wood and construction sectors. Timber housing producers and dealers are the research object under analysis to study the electronic market of this Brazilian sector on Instagram®. With just over four hundred companies, nearly 80% of this sector already utilizes this virtual social network. We validated the outcomes through a significant sampling of all 315 companies with corporate profiles to identify their competences, goals, and failures. The profiles prioritize the elucidation of products and basic features, not yet being ready for the virtual sales of timber houses. The study makes it clear that our results typify a sector marked by a developing electronic market. Inserting a description of product prices and detailed specifications may change this status. From failures and competences, a classification for social profiles was proposed to measure the progress and virtual participation of each individual.

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“…Thus, the use of non-traditional species for several applications worldwide requires specific knowledge of the physical and mechanical properties of wood, such as the fc0,k strength, which have great significance for wood products and construction (Wolenski et al, 2020). For hardwoods, usually applied for structural projects due to high mechanical strengths (Almeida et al, 2020b), the ABNT NBR 7190 (1997) As the C40 strength class contemplates a wide range of fc0,k, values, the C50 category (50 MPa ≤ fc0,k < 60 MPa), which is not included in the Brazilian standard document cited has been adopted by some literature studies such as Logsdon et al (2010), Lima et al (2018), Cruz et al (2021 and Wolenski (2022).…”

Section: Introductionmentioning

confidence: 99%

Strength classes of brazilian hardwoods for structural design

Silva,

Almeida,

Daciolo

et al. 2024

Cad. Pedagógico

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For the elaboration of projects on timber structures, the Brazilian standard (ABNT, in Portuguese Associação Brasileira de Normas Técnicas) 7190 (ABNT 1997) ensures the correct application of physical-mechanical properties according to strength classes of lignocellulosic materials. This procedure eliminates the need for botanical identification of woods, since these strength classes support the efficient utilization of a wide range of woody varieties available in Brazil. Due to high mechanical resistances, the hardwoods are usually applied for structural projects of timber construction. This Brazilian standard document prescribes four strength classes (C20, C30, C40 and C60) for these woods, which are determined by characteristic value from the compressive strength parallel to the grain (fc0,k). But, these classes were obtained from experimental outcomes using a few wood varieties. The reorganization of strength classes should result in the best use of mechanical potentials of woods since the updating of these categories leads to the optimization of structural projects for timber construction in order to reposition this biomaterial at even more competitive levels. In this context, the present study aims to verify the current strength classes of hardwoods and if they lead to a good allocation of the fc0,k characteristic values. Otherwise, new strength classes can be determined for better allocations for efficient structural uses. As a result, 56 hardwoods were considered using 672 experimental determinations. Statistically, the current categories can lead to 12,5 % of incorrectly allocated values. The inclusion of C50 and C70 classes allow greater representation for these categories, in order to optimize the use of the hardwoods given the new strength classes. These findings ought to support future revisions of this Brazilian standard document.

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Evaluation of mechanical strengths of tropical hardwoods: proposal of probabilistic models

Cited by 7 publications

References 20 publications

Models to estimate longitudinal compressive strength of Brazilian hardwood based on apparent density

Models to estimate longitudinal compressive strength of Brazilian hardwood based on apparent density

Is the Timber Construction Sector Prepared for E-Commerce via Instagram®? A Perspective from Brazil

Strength classes of brazilian hardwoods for structural design

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