Glued-laminated timber from northern hardwoods: Effect of finger-joint profile on lamellae tensile strength

Morin-Bernard, Alexandre; Blanchet, Pierre; Dagenais, Christian; Achim, Alexis

doi:10.1016/j.conbuildmat.2020.121591

Cited by 16 publications

(13 citation statements)

References 19 publications

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“…Lehmann et al [14] investigated the finger-joint strength by bending and tensile tests and reported that the finger-joint technique is sufficient to make glulam beams from beech with a characteristic bending strength of up to 55 MPa. Morin-Bernard et al [15] tested finger-jointed boards made from three hardwood species and confirmed that white ash, yellow birch, and white oak could achieve characteristic tensile strengths up to 36.4 MPa, 33.6 MPa, and 35.8 MPa, respectively. Moreover, some scholars identified the limitation of the structural applications of certain finger-jointed boards from hardwood species.…”

Section: Introductionmentioning

confidence: 94%

Study on the Effect of Finger-Joints on the Strengths of Laminations from Fiber-Managed Eucalyptus nitens

Hou

Taoum

Kotlarewski

et al. 2023

Forests

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The performance characteristics of finger-joints as a jointing technique for Eucalyptus nitens is crucial for their use in engineered wood products. This research evaluated the strength of the finger-jointed laminations made from fiber-managed E. nitens. A total of 237 specimens with (117 pieces) and without (120 pieces) finger-joints were sectioned from finger-jointed laminations and tested by bending, tensile, shear, and bearing tests. Bending and tensile tests were paired to identify any correlations. The mean value with finger-joints for bending and tensile were 92.1 MPa and 79.6 MPa, respectively. The presence of finger-joints reduced the strength values. Joint efficiencies in bending and tensile are 0.73 and 0.62, respectively. The distributions of bending and tensile strength were similar for the samples without finger-joints. For the samples with finger-joints, tensile strength was significantly lower than paired bending strength. Shear test results show that the short-span test is inefficient in obtaining the shear strength of fiber-managed E. nitens boards. Meanwhile, the finger-joint efficiency in the bearing is 0.86. The prediction models of lamination’s bending, tensile, and bearing strength were established by non-destructive properties as predictors. Bending strength was highly correlated to the modulus of elasticity value, while tensile and bearing strength were correlated to density. This study obtained promising results on finger-jointed boards from fiber-managed E. nitens suggesting they could be suitable for structural purposes.

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Section: Introductionmentioning

confidence: 94%

Study on the Effect of Finger-Joints on the Strengths of Laminations from Fiber-Managed Eucalyptus nitens

Hou

Taoum

Kotlarewski

et al. 2023

Forests

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“…While traditionally produced using softwood species, there is a growing interest in incorporating hardwood species into glulam production. [1][2][3] The bonding strength of finger joints is a crucial technical property for longitudinally joined elements. Therefore, selecting the appropriate finger joint composition is of utmost importance, and considerable attention is dedicated to this aspect.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Bending Strength Properties between Glued and Un-Glued Finger Joints in Beech and Fir Wood Species

Šljivo,

Hasanagić,

Fathi

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The aim of this study was to investigate the mechanical behavior of beech and fir finger joints under laboratory conditions. The samples were manufactured using a 9 mm finger joint with glued surfaces, in accordance with the EN 14 080 standard. Polyurethane adhesive of class D3, commonly used for the production of exterior wooden structures in Bosnia and Herzegovina, was applied to the samples. The specimens were subjected to destructive four-point bending tests according to the BAS EN 408 standard, and the achieved bending strength was statistically evaluated and compared to the results of unglued samples.

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“…Finger joint parameters are, therefore, observed to determine which are more closely related to the strength of a given specimen. Many compressive research works (Özçifçi and Yapıcı 2008;Hernández et al 2011;Rao et al 2012;Yeh and Lin 2012;Morin-Bernard et al 2021) have been carried out, employing different finger joint lengths and pitch lengths, resulting in finger joints with different slopes. Experimental results have shown that the length of the finger is one key parameter affecting finger joint strength (Ayarkwa et al 2000): fingers with relatively flat slopes and sharp tips could achieve a high strength finger joint, even for finger lengths shorter than the usual length in current practice.…”

Section: Introductionmentioning

confidence: 99%

Analysis of poplar timber finger joints by means of Digital Image Correlation (DIC) and finite element simulation subjected to tension loading

et al. 2022

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Due to the strong demand for wood, and the need to reduce the carbon footprint in construction, fast-growing low-graded planted species like poplar are promising wood for the supply chain in the context of engineered wood products, EWPs. Finger joints constitute a key technology for the manufacture of long structural elements of EWPs. Thus, evaluation of the mechanical properties of finger joints is important when designing these structural members. This paper shows the results of mechanical behaviour in tension of poplar timber of the I-214 cultivar, for specimens with and without finger joints, using experiments monitored by DIC (Digital Image Correlation) and simulated by the Finite Element Method. For moderate and intermediate loads, the samples with finger joints showed behaviour similar to those without joints. However, the presence of the fingers decreased the mechanical properties of the modulus of elasticity in the longitudinal direction anywhere from 7.7 to 23.7%; and there was a decrease of around 27.5% in tensile strength. An agreeable correlation between the DIC results and FEM simulations is obtained for the longitudinal, transversal, and shear strain fields, thus demonstrating the high potential of both methodologies.

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Glued-laminated timber from northern hardwoods: Effect of finger-joint profile on lamellae tensile strength

Cited by 16 publications

References 19 publications

Study on the Effect of Finger-Joints on the Strengths of Laminations from Fiber-Managed Eucalyptus nitens

Study on the Effect of Finger-Joints on the Strengths of Laminations from Fiber-Managed Eucalyptus nitens

Comparative Analysis of Bending Strength Properties between Glued and Un-Glued Finger Joints in Beech and Fir Wood Species

Analysis of poplar timber finger joints by means of Digital Image Correlation (DIC) and finite element simulation subjected to tension loading

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