Abstract
Reinforcement for flexion in structural elements with finger-joints using fibers has emerged as a particularly suitable technique for timber. Thus, the objective of this study was to evaluate the performance of Glued Laminated Timber (GLULAM) produced with Eucalyptus spp. wood and three reinforcement compositions, “Glass”, “Glass2” and “Carbon” regarding parallel-to-grain tensile strength, normal tensile strength, shear strength and the three-point bending test. All the tests were performed according to the NBR 7190/1997 using the Tukey test for statistical analyzes and a 95% confidence interval. The performance of the Eucalyptus spp. GLULAM did not present significant differences in evaluation of the bonding lines. However, the “Glass 2” and “Carbon” treatments were significantly superior to the GLULAM samples without reinforcement in bending strength, reaching increments of 37.8% and 40.5%, respectively. The modulus of elasticity did not differ significantly between them. A tensile rupture was observed in the region of the finger-joints in all the evaluated samples; however, the flexural tensions were superior to the parallel-to-grain tensile strengths, indicating an influence of the timber thickness and reinforcement thickness on the performance of the reinforced joints. Thus, it is possible to conclude that applying concentrated reinforcement in the region of the finger-joints significantly improves the performance of Eucalyptus spp. GLULAM samples.
Highlights
The increase in the timber market due to timber use in civil construction is a reality worldwide
The average moisture content of the Eucalyptus spp. samples was 12%, indicating that the pieces were of adequate moisture content for Glued Laminated Timber (GLULAM) manufacturing
Physical properties The average moisture content of the Eucalyptus spp. samples indicate that the pieces were of adequate moisture content for GLULAM manufacturing
Summary
The increase in the timber market due to timber use in civil construction is a reality worldwide It has primarily occurred because of the great versatility of this material, which can be processed in various ways such as into lumber, slides, particles and fibers. Considering the importance that GLULAM has obtained in these practices because of its use in large and durable structures, its capacity to overcome large spans and high loads (GLIŠOVIĆ et al, 2015), as well as the focus on decreasing the use of native wood sources (BAYATKASHKOLI et al, 2012; HABIPI et al, 2016), studies should be carried out to assist the development of using wood provided by planted forests in this technology It is one of the oldest products resulting from glued timber, GLULAM is not yet a fully justifiable material for use in Brazilian construction projects due to the small tradition of its use, the high cost of adhesives and the small number of companies involved in manufacturing. Its advantages in FLORESTA, Curitiba, PR, v. 51, n. 1, p. 109-117, jan/mar 2021
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