The effect of number of joints on bending properties of laminated lumber made from poplar (Populus nigra)

Bayatkashkoli, Ali; Shamsian, Mohammad; Mansourfard, Marjan

doi:10.1007/s11632-012-0313-0

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…Generally, wooden beams are more requested by parallel to the grain stresses and, consequently, to the GLULAM blades and its joints. Therefore, develop a new technology that is capable to resist tensile stress has been the objective of many researches in multiple longitudinal joints in recent years (BUSTOS et al, 2003;BAYATKASHKOLI et al, 2012;RAO et al, 2012;IWAKIRI et al, 2013;FINK & KOHLER, 2015;KHELIFA et al, 2015a;HABIPI et al, 2016;KHELIFA et al, 2016). However, there are few works related to composite application exclusively in finger-joints (KHELIFA et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

Strength of Structural Finger-Joints Reinforced With Fibers

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The finger-joints are the kind of top joints most used in wood blades to manufacture glued laminated timber (GLULAM) and present direct influence on their rigidity and final mechanical strength. Thus, the objective of this study was to evaluate the tensile strength parallel to grain with different compositions of reinforcements concentrated on finger-joints. Two geometries were used to execute the finger-joints and two species: Pinus taeda and Eucalyptus spp. The reinforcements were fabrics from glass or carbon fibers bonded with polyurethane structural adhesive. The treatments used were: "A-Glass", "A-Glass2", "A-Carbon", “A-Without reinforcement”, "B-Glass", "B-Glass2", "B-Carbon" and “B-Without reinforcement”, being "A" or "B", the geometries and "2", the number of layers of tissue. For statistical analysis, the Dunnett test was used at 95% confidence interval. The results showed that the execution of the unreinforced finger-joints decreased the tensile strength of the woods. For P. taeda, all the treatments were significantly inferior to the control (without finger-joints), and for Eucalyptus spp., only the treatment "A-Unreinforced" presented inferior performance to the control (without finger-joints), all others presented equivalent mechanical resistance to solid wood. It can be concluded that for the Eucalyptus spp. wood, the application of reinforcement on the structural finger-joints improves the tensile strength, equating to the solid wood.

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Section: Introductionmentioning

confidence: 99%

Strength of Structural Finger-Joints Reinforced With Fibers

Bourscheid

Terezo

Rios

et al. 2018

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“…The quality of component parts becomes low as a result of increasing the number of glued joints. The strengths of final products are reduced when the number of small sized timbers glued together increases within dimension boards (Bayatkashkoli, Shamsian and Mansourfard 2012). Therefore, when the component parts are made with end to end joints and glued faces, this has a negative effect on the strength of the chairs.…”

Section: Introductionmentioning

confidence: 99%