Mechanical Properties of Paricá Wood Using Structural Members and Clear Specimens

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

doi:10.5923/j.ijme.20160602.06

Cited by 10 publications

(11 citation statements)

References 9 publications

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“…Desiring to demonstrate the wood potential, Cavalheiro et al [21] showed that wood Paricá (Schizolobium amazonicum), strength class C20, has good strength properties and therefore has great potential for use in timber structures.…”

Section: Art Statementioning

confidence: 99%

Timber Use in Truss Structures for Roof (“Howe” Type – 8 to 18 Meters)

Palludo¹,

Pinheiro²,

Almeida³

et al. 2017

ijme

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The wood is a material widely used for several purposes, especially in the construction industry. There are many factors that this is due, between them the versatility and abundant availability of the material. However, the intensive use of some species might cause shortages. The lack of information about the wood behavior when it is exposed to various conditions, as well as projects not supported by regulatory rules, may imply in its inappropriate use, compromising in the safety of the structure. In this context, it was proposed the elaboration of roofing structures projects with the following characteristics: lattice type buildings "Howe" (10° slope -cement tile); span of 8, 10, 12, 14, 16 and 18 meters (geometrical proportion, in design, surrounding a 1: 3); typology of the lateral side of the building openings -relations 1:1, 2:1, 6:1 and open (coverage of small dimensions' support) preservative treatment. Then, was determined the ratio of the wood amount (m³) and the built area (in design) to woods of C20 and C30 classes, following the requirements of NBR 7190: 1997. Front of the analysis of results was evidenced that it is possible to use unconventional woods applied in triangle framework structure in big spans, obeying a well elaborated conception of project.

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Section: Art Statementioning

confidence: 99%

Timber Use in Truss Structures for Roof (“Howe” Type – 8 to 18 Meters)

Palludo¹,

Pinheiro²,

Almeida³

et al. 2017

ijme

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“…This may be related mainly to the origin and age of the trees considered. The MOEs for paricá beams without preservative treatment evaluated by Cavalheiro et al (2016) using the same glue as that used in this work and for beams chemically treated with CCA were 9,150 and 8,764 MPa, respectively. These values are much lower than our findings, as seen in Table 2.…”

Section: Mechanical Properties Of Beamsmentioning

confidence: 93%

“…The average values of untreated beams reported by Terezo & Szücs (2010) for normal tensile and shear parallel to the bonding line were 3.81 and 2.97 MPa, respectively. Cavalheiro et al (2016) reported a 3.40 MPa value for the shear strength parallel to the bonding line. These lower results may be due to the tree planting site and age variability.…”

Section: Bonding Line Strengthmentioning

confidence: 99%

CHEMICALLY TREATED GLUED LAMINATED PARICÁ TIMBER (Schizolobium parahyba var. amazonicum)

2019

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In the production of glue-laminated timber (GLT), boards derived from planted forest wood with easy workability are glued on top of one another. The main objective of the present work was to evaluate the performance of paricá timber GLT beams (5 × 10 cm) on GLT. Three procedures were performed: (1) GLT beams (5 × 10 cm) were produced using natural lamellae without chemical preservatives; (2) the individual lamellae (2.5 × 5 cm) were chemically treated, and then glued together; and (3) the beams formed from the glued natural lamellae (5 × 10 cm) were treated chemically. The positions of lamellae on the beams were determined by their modulus of elasticity values (MOE), which were estimated by a non-destructive bending test with a three-point load. The analytical bends, determined by the homogenized section method, and the experimental bends, measured by the four-point bending test, were compared. The differences between the bends were statistically evaluated, and it was found that the experimental bend (21.65 mm) was less than the analytical bend (34.02 mm). There was no significant loss of shear strength or MOE. The axial strength of the chemically untreated beams (49.18 MPa) was significantly higher than that of the untreated beams fabricated from natural lamellae (40.48 MPa). The results indicate that the gluing of treated lamellae does not affect beam performance.

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“…Para confecção dos corpos de prova e procedimentos de ensaios para determinação das propriedades físicas e mecânicas, foram seguidas as recomendações do Anexo B "Determinação das Propriedades das Madeiras para Projetos de Estrutura" da norma ABNT NBR 7190 (1997) [18]. Para isso, foram caracterizadas duas duas propriedades físicas e cinco propriedades mecânicas (Tabela 1), sendo fabricados 12 corpos de prova para cada uma, para ambos os lotes.…”

Section: Materiais E Métodosunclassified

“…Esta variabilidade das propriedades da madeira pode estar relacionada com as características inerentes das diferentes espécies e gêneros de árvores que fornecem este material, além disso, por fatores anatômicos, direção das fibras, densidade e teor de umidade [16][17][18][19][20]. O teor de umidade da madeira é de fundamental conhecimento para a estimativa de suas propriedades físicas e mecânicas e para o seu emprego de maneira racional na construção civil.…”

Section: Introductionunclassified

Propriedades físicas e mecânicas da madeira Tatajuba (Bagassa guianensis) proveniente de duas diferentes regiões brasileiras

Lima

Almeida

et al. 2018

Matéria (Rio J.)

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RESUMO Como consequência dos fatores edafoclimáticos, as propriedades da madeira podem ser influenciadas de acordo com a região de desenvolvimento da árvore. O objetivo do presente trabalho consistiu em verificar a influência da região de extração de lotes da madeira de Tatajuba (Bagassa guianensis), provenientes de duas diferentes regiões do Brasil (Alta Floresta e Bonfim do Sul, municípios dos estados de Mato Grosso e Roraima, respectivamente), ao teor de umidade de 12%, em algumas de suas propriedades físicas e mecânicas. Para cada um dos lotes foram determinadas duas propriedades físicas e cinco propriedades mecânicas, de acordo com a norma ABNT NBR 7190:1997. Para avaliar a influência da região de extração nas propriedades, foi realizada a análise de variância de Kruskal-Wallis, considerando resultados significativos (valores não equivalentes) aqueles que atendiam à condição P-valor < 0,05. De acordo com os resultados da análise estatística, os diferentes lotes da mesma espécie de madeira apresentaram valores médios das propriedades estudadas equivalentes em relação ao conjunto composto por todas as madeiras, porém, os valores médios da resistência na compressão paralela (fc0) e da densidade aparente não foram significativos entre as duas regiões. Os valores característicos da fc0 foram diferentes para os lotes das duas regiões, ao teor de umidade de 12%, implicando em classes de resistência diferentes (D50 – Alta Floresta e D60 – Bonfim do Sul).

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Mechanical Properties of Paricá Wood Using Structural Members and Clear Specimens

Cited by 10 publications

References 9 publications

Timber Use in Truss Structures for Roof (“Howe” Type – 8 to 18 Meters)

Timber Use in Truss Structures for Roof (“Howe” Type – 8 to 18 Meters)

CHEMICALLY TREATED GLUED LAMINATED PARICÁ TIMBER (Schizolobium parahyba var. amazonicum)

Propriedades físicas e mecânicas da madeira Tatajuba (Bagassa guianensis) proveniente de duas diferentes regiões brasileiras

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