Finger Joint Strength. A Laminated Beam Strength Predictor?

Burdzik, W.M.G.

doi:10.1080/10295925.1997.9631137

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…According to Burdzik (1997) and Nascimento et al (2002), inferior strength laminations are the ones that initiate the rupture process in the relevant tensioned area, as opposed to those undergoing rupture in areas with natural defects. Falk & Colling (1995) evaluated this effect in glulam beams produced in Europe and USA and suggest that the mechanical quality grading of laminations subjected to greater tension is an indicator of strength properties against bending and seems to be an effective way of rating glulam beams.…”

Section: Teles R F Et Almentioning

confidence: 99%

Effect of nondestructive testing of laminations on the bending properties of glulam beams made from louro-vermelho (Sextonia rubra)

Teles¹,

Menezzi

Souza

et al. 2010

CERNE

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This work aims to assess the bending properties of glued laminated timber beams (glulam) manufactured with species louro-vermelho (Sextonia rubra). Laminations were nondestructively tested using the transverse vibration method (E Mlam ). Then 10 glulam beams were manufactured and tested in static bending according to ASTM D 198 standard, having modulus of elasticity (E M ), modulus of rupture (f M ), and bending moment (M) determined. The finished beams were also tested by the transverse vibration method (E Mvt ). It was noted that the E Mvt value was only 2% lower than the E M value. Using laminations with a high modulus of elasticity did allow effective gain in stiffness. Therefore, results indicate that the transverse vibration method is a valid, reliable technique both for testing glulam laminations and for assessing stiffness in finished beams. Bending properties in glulam beams were influenced by the stiffness of constituent laminations.Key words: Transverse vibration, glued laminated timber, static bending. EFEITO DA CLASSIFICAÇÃO NÃO DESTRUTIVA DAS LÂMINAS SOBRE AS PROPRIEDADES DE FLEXÃO DE VIGAS MLC PRODUZIDAS COM LOURO-VERMELHO (Sextonia rubra) RESUMO: Conduziu-se este trabalho, com o objetivo de avaliar as propriedades de flexão de vigas de madeira laminada colada (MLC) produzidas com a espécie louro-vermelho (Sextonia rubra). As lâminas foram classificadas não destrutivamente pelo método de vibração transversal (E Mlam ). Em seguida, 10 vigas de MLC foram produzidas e ensaiadas em flexão estática, conforme a norma ASTM D 198 e determinados o módulo de elasticidade (E M ), o módulo de ruptura (f M ), e o momento fletor (M). As vigas consolidadas foram ainda avaliadas pelo método de vibração transversal (E Mvt

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Section: Teles R F Et Almentioning

confidence: 99%

Effect of nondestructive testing of laminations on the bending properties of glulam beams made from louro-vermelho (Sextonia rubra)

Teles¹,

Menezzi

Souza

et al. 2010

CERNE

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show abstract

“…However, finger-joints have been identified as weak components [4,5]. Initial failures at a finger-joint in the extreme tension laminate have been found in the glulam beam bending tests [6,7]. Therefore, the performance of finger-joints is as important as the wood properties of sawn boards.…”

Section: Introductionmentioning

confidence: 99%

“…It is necessary to study the strength of finger joints to promote the utilization of fiber-managed E. nitens in engineered wood products. The finger-joint strength has been identified as the predictor for estimating the laminated beam's strength [6]. According to the Australian Standard 1328.1: 1998 [17], glulam members' characteristic bending and tensile strength are calculated by a finger joint's characteristic bending and tensile strength, respectively, while according to European standards, the strength of glulam members depends on both the bending and tensile strength of finger joints [18].…”

Section: Introductionmentioning

confidence: 99%

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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The behavior of horizontally glued laminated beams using rubber wood

Nadir

Nagarajan

2014

Construction and Building Materials

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Finger Joint Strength. A Laminated Beam Strength Predictor?

Cited by 3 publications

References 5 publications

Effect of nondestructive testing of laminations on the bending properties of glulam beams made from louro-vermelho (Sextonia rubra)

Effect of nondestructive testing of laminations on the bending properties of glulam beams made from louro-vermelho (Sextonia rubra)

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

The behavior of horizontally glued laminated beams using rubber wood

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