Historic “HAUFF” Timber Roofs in Poços de Caldas in Brazil

Brito, Leandro Dussarrat; Christofóro, André Luis; Segundinho, Pedro Gutemberg de Alcântara; Lahr, Francisco Antônio Rocco; Calil, Carlito

doi:10.5923/j.ijme.20160603.09

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…It is observed in Brazil the international tendency of wood structure industrialization, making possible several possibilities of structural systems, and beyond that, the prioritization of hyperstatic structures replacing the isostatic ones (BRITO et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Analytical study of the dimensional stability of tropical brazilian wood species

Almeida

Aquino

et al. 2023

Ciênc. Florest.

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Brazil owns a large vegetal covering and the best utilization of these materials requires physical and mechanical characterization procedures. Equations found in the literature make easier the wood properties determination. At this context, well known authors developed the equation βl = βt/23, being βl and βt the longitudinal and tangential shrinkage percentages, for βl estimation based on the βt value specially for wood species from the Northern hemisphere. This paper aims to investigate the accuracy of this equation for fifteen tropical Brazilian wood species covering the entire range of hardwood strength classes according to the Brazilian Normative ABNT NBR7190. The average experimental values of βl and βt were 7.71% (CV = 26,71%) and 0.73% (CV = 38,76%), respectively. The non-parametric Kruskal-Wallis ANOVA refuted the hypothesis of equivalence between theoretical and experimental βl values (p-value = 0.0000). A linear regression model fitted to experimental values provided βl = βt/9,84 as optimal solution (p-value = 0.0000, R2 = 47,23%). According to results it is possible to conclude that the value of longitudinal shrinkage percentage of tropical Brazilian wood species is statistically 2,34 times greater than the value found in the literature, which impacts the design of timber structures procedures increasing the internal stresses in timber structural elements.

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Section: Introductionmentioning

confidence: 99%

Analytical study of the dimensional stability of tropical brazilian wood species

Almeida

Aquino

et al. 2023

Ciênc. Florest.

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Influence of Exposure Time to Operating Temperature on Shear Strength of Wood Used in Roof Structures

Christofóro

Almeida

et al. 2019

Eng. Agríc.

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Wood is one of the main materials used in the constructing of covering structures (roofs) because of its versatility. Under this situation, due to solar radiation incidence, the temperature can exceed 60 °C and, such as other environmental conditions, influence the mechanical properties of the wood in use. The aim of this research was to study the influence of exposure time of the wood of four different hardwood species at a temperature of 60 °C on the shear strength parallel to fibers. The wood of the following species was used: Cupiúba (Goupia glabra), Eucalyptus (Eucalyptus saligna), Garapeira (Apuleia leiocarpa), and Jatobá Tamarindo (Hymenaea sp.). In order to investigate the effect of exposure time (0, 168, 456, 720, and 2160 hours) of the wood species in an oven (60 °C) on the values of shear strength in the direction parallel to fibers, an analysis of variance (ANOVA) was carried out at 5% significance level. According to the results, the time the wood was exposed to the operating temperature significantly influenced the shear strength in the direction parallel to fibers. In addition, all species showed a decrease in shear strength after 456 hours of exposure at a constant temperature of 60 °C.

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Historic “HAUFF” Timber Roofs in Poços de Caldas in Brazil

Cited by 2 publications

References 4 publications

Analytical study of the dimensional stability of tropical brazilian wood species

Analytical study of the dimensional stability of tropical brazilian wood species

Influence of Exposure Time to Operating Temperature on Shear Strength of Wood Used in Roof Structures

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