Mechanical properties of finger jointed beams fabricated from eight Malaysian hardwood species

Ahmad, Zakiah; Lum, Wei Chen; Lee, Seng Hua; Razlan, Mohd Azran; Mohamad, Wan Munirah Wan

doi:10.1016/j.conbuildmat.2017.04.016

Cited by 24 publications

(11 citation statements)

References 16 publications

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“…The number of fingers and the adhesion area were less in the horizontal joint placed along the thickness of the beams; thus, the strengths of the beams were lower. It was stated in previous studies that the local elastic properties of each finger affected the failure modes and strength, and the vertical finger-jointed beam displayed higher bending strength (Yeh and Lin 2012;Ahmad et al 2017;Lara-Bocanegra et al 2017).…”

Section: Analysis Of Main Effectsmentioning

confidence: 95%

“…In a previous study, the influence of several variables on finger-joint bending strength and failure mode, such as end pressure, dynamic elastic modulus of the wood, density, length, and width of the fingertip, were analyzed, and better results were obtained in finger joints with the longest finger length and the smallest tip width (Lara-Bocanegra et al 2017). In another study, the effects of finger orientations (horizontal and vertical) and finger lengths (15 mm and 25 mm) on the mechanical properties of finger-jointed beams were evaluated, and the beam-jointed vertical finger orientations and the longer finger length showed a better behavior than the beam-jointed horizontal finger orientations and the shorter finger length (Ahmad et al 2017). The finger joint geometry has a significant effect on the strength of finger-jointed wood elements.…”

Section: Introductionmentioning

confidence: 99%

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Effects of layer number and finger direction on bending behavior of glulam beams

İşleyen

Peker

2020

BioRes

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Effects of the number of layers and the number and typology of finger joints were studied relative to the bending behavior of glulam beam made of Scots pine (Pinus sylvestris) laminates. The investigated parameters of glulam beams with constant overall dimensions (width × depth × length) of 90 mm × 90 mm × 1710 mm were lamination thickness (18 mm or 30 mm), the distance of the finger joints (200, 400, and 600 mm), and finger direction (horizontal and vertical). A total of 14 experimental samples were produced (12 different finger joint beams and two reference beams without finger joints) and tested under four-point bending tests. Taguchi orthogonal experimental design was used to evaluate and optimize test results using the S/N ratio. The effects of main and interactions between producing parameters on strength of glulam beam were determined by variance analysis. According to the results of the analysis, it was determined that the number of layers and the direction of the finger had a significant effect on the flexural strength of the beams, but the finger distance was not significant. Moreover, the highest strength values were obtained in 5-layer finger-jointed beams with vertical finger direction.

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Section: Analysis Of Main Effectsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Effects of layer number and finger direction on bending behavior of glulam beams

İşleyen

Peker

2020

BioRes

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show abstract

“…Nowadays, finger-joint is the most usual type of connection used to join lamellae ends in glulam industries (Stark et al 2010). Finger-joints strength depends on wood density, finger length (Ahmad et al 2017) and adhesive type (Özçifçi and Yapici 2008). Moreover, failure modes of hardwood glulam beams with finger-joints positioned in greater tension stress areas often occur on finger-joints, due to their lack of strength to endure this stress (Nadir andNagarajan 2014, Tran et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on full-scale glulam beams manufactured with Eucalyptus urograndis

Nogueira¹,

Icimoto²,

Calil³

et al. 2022

Maderas, Cienc. tecnol.

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Engineered wood products need alternatives of raw materials to their production. The hybrid Eucalyptus urograndis has great potential to supply the demand of this industrial sector. In this context, the present paper aims to analyse the feasibility of using Eucalyptus urograndis in glued laminated timber (glulam) production. To this end, four groups with ten glulam beams each, were produced and tested. An extensive experimental program was performed in order to determine: the stiffness and bending strength of the beams; and the compression strength parallel to grain of the beams. The performance of structural adhesives was verified based on shear tests of glue lines. The experimental mean of stiffness was higher than 14675 MPa and the characteristic value of compression strength parallel to grain achieved a value above 40 MPa. Nevertheless, failure mode of the glulam beams showed that finger-joints reduced bending strength. The glulam beams produced with Eucalyptus urograndis proved to be a feasible alternative due to their mechanical properties. However, this material presents difficulties in finger-joints adhesion.

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“…However, there are still several unknowns regarding finger jointing for hardwoods, or for new species/adhesives combinations. The influence of the manufacturing process on the mechanical properties of finger-joint hardwoods has been approached with emphasis on the production conditions such as timber conditioning (Raknes 1980), curing time and end pressure (Bourreau et al 2013), finger-joint geometry (Ahmad et al 2017;Özçifçi 2008; and other several interlinked factors (Vrazel 2004). In addition, an extensive literature related to the gluing performance and adhesive evaluation is available Vassiliou et al 2006;Volkmer et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical evaluation of the structural performance of Uruguayan Eucalyptus grandis finger-joint

Vega

Baño

Cardoso³

et al. 2020

Eur. J. Wood Prod.

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The aim of this study was to evaluate the structural performance of finger-joints made of Uruguayan Eucalyptus grandis and two types of adhesives. A numerical model for bending strength and stiffness prediction was developed. Model inputs were experimentally determined from tests on wooden specimens and from literature. Finger-joints glued with two types of adhesives (one-component polyurethane-PUR-and emulsion polymer isocyanate-EPI-) were tested in bending and the failure modes were evaluated. Results show that adhesive type did not influence the stiffness of the finger-joint, while did influence the bending strength. Specimens glued with PUR showed higher strength than those glued with EPI. A 3D model, using Comsol Multiphisic software, was developed to simulate the finger-joint behavior. Adhesive-wood interaction in the finger-joints was modeled using the Comsol Thin Elastic Layer module, defined by the elastic properties of the adhesives. The numerical results showed no differences on the stiffness of the joints regardless of adhesive type. Results agreed with those obtained from experimental tests, with a maximum error of 7%. Models predicted the bending strength with an error of 6% with respect to the experimental values. Different finger configurations were analyzed, and the optimal geometry (20 mm-length, 6.2 mm-pitch and 1.0 mm-tip-thick) to attain the maximum strength for Uruguayan Eucalyptus was found.

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Mechanical properties of finger jointed beams fabricated from eight Malaysian hardwood species

Cited by 24 publications

References 16 publications

Effects of layer number and finger direction on bending behavior of glulam beams

Effects of layer number and finger direction on bending behavior of glulam beams

Experimental study on full-scale glulam beams manufactured with Eucalyptus urograndis

Experimental and numerical evaluation of the structural performance of Uruguayan Eucalyptus grandis finger-joint

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