Abstract
ABSTRACT 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: Cupiuba (Goupia glabra), Eucalyptus (Eucalyptus saligna), Garapeira (Apuleia leiocarpa), and Jatoba 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.
Highlights
Wood is one of the main materials used in the construction industry, either as a structural element (Almeida & Dias, 2016; Cavalheiro et al, 2016; Garcia et al, 2017), cover structures and roofs (Christoforo et al, 2011; Palludo et al, 2017) or as a support material for construction (Calil Junior & Molina et al, 2010).In Brazil, the wood used as structural elements in constructions has two different origins
This research aimed 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 in the direction parallel to fibers
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) at 5% significance level (α) was carried, consisting of the equivalence of means as null hypothesis (H0) and non-equivalence as alternative hypothesis (H1)
Summary
In Brazil, the wood used as structural elements in constructions has two different origins. In Brazil, the standard ABNT NBR 7190 (1997) “Wood Structures Project” regulates the guidelines for projects and for carrying out laboratory tests to estimate the physical and mechanical properties of wood. It is important because it allows the rational use of this raw material in structures, considering the variability of the material and the need for attention related to its degradation in use (Macedo et al, 2014; Lahr et al, 2016a; Pigozzo et al, 2017)
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