Internal reinforcement of laminated duo beams of low-grade timber with GFRP sheets

Basterra, Luis-Alfonso; Balmori, José Antonio; Morillas, Leandro; Rello, Luis Acuña; Casado, M.

doi:10.1016/j.conbuildmat.2017.08.007

Cited by 26 publications

(12 citation statements)

References 20 publications

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“…A displacement rate of 1 mm/min was employed during testing. The results reached [53] were a mean Young's modulus of 21,610 MPa (CoV 4.43%) and a mean ultimate tensile strength of 455 Mpa (CoV 6.26%) for the UNI-1200 GFRP sheet.…”

Section: Gfrp Reinforcementsmentioning

confidence: 97%

Internal GFRP Reinforcement of Low-Grade Maritime Pine Duo Timber Beams

2020

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This paper presented an experimental structural-scale test campaign used to analyze the flexural behavior of low-grade maritime pine (Pinus pinaster Ait.) duo timber beams reinforced with an internal glass fiber-reinforced polymer (GFRP) sheet. For this purpose, thirty (30) unreinforced duo beams and thirty (30) duo beams internally reinforced with a unidirectional GFRP sheet with an areal mass of 1200 g/m2 were produced and tested. The addition of a low GFRP reinforcement ratio (1.07%) in the tension zone of the duo beams provided an average improvement of 8.37% in bending stiffness (EI) and an increase of up to 18.45% in ultimate moment capacity. In addition to this improved bending behavior, the internal GFRP reinforcements seemed to decrease the influence of wood singularities and wood heterogeneity on mechanical properties, which allowed for better characteristic values to be reached and for the achievement of results with less variability.

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Section: Gfrp Reinforcementsmentioning

confidence: 97%

Internal GFRP Reinforcement of Low-Grade Maritime Pine Duo Timber Beams

2020

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“…In the paper presented in 2005 by Schober [ 44 ], an increase in bending stiffness of 5.86% in relation to unreinforced beams was obtained. Basterra et al [ 48 ] obtained an increase of 23% in load-bearing capacity and an increase of 12–15% in stiffness using internal GFRP reinforced for laminated duo beams of low-grade timber. Nowak et al [ 19 ] in 2013 observed an increase in the load-bearing capacity of beams reinforced with CFRP tapes ranging from 21% up to 79%.…”

Section: Literature Surveymentioning

confidence: 99%

The Influence of CFRP Sheets on the Load-Bearing Capacity of the Glued Laminated Timber Beams under Bending Test

et al. 2021

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Composite materials are increasingly used to strengthen existing structures or new load-bearing elements, also made of timber. In this paper, the effect of the number of layers of Carbon Fiber Reinforced Polymer (CFRP) on the load-bearing capacity and stiffness of Glued Laminated Timber beams was determined. Experimental research was performed on 32 elements—a series of eight unreinforced beams, and three series of eight reinforced beams: with one, three and five layers of laminate each. The beams with a cross-section of 38 mm × 80 mm and a length of 750 mm were subjected to the four-point bending test according to standard procedure. For each series, destructive force, deflection, mode of failure, and equivalent stiffness were determined. In addition, for the selected samples, X-ray computed tomography was performed before and after their destruction to define the quality of the interface between wood and composite. The results of the conducted tests and analyses showed that there was no clear relationship between the number of reinforcement layers and the load-bearing capacity of the beams and their stiffness. Unreinforced beams failed due to tension, while reinforced CFRP beams failed due to shear. Despite this, a higher energy of failure of composite-reinforced elements was demonstrated in relation to the reference beams.

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“…From their observation, the fibres arranged in the longitudinal direction (zero direction) had the highest capacity of strength and along with findings by John and Lacroix (2000) that utilized U-shaped GFRP sheets to provide both shear and flexural reinforcement. Basterra et al (2017) tested the possibility of partial reinforcement of a glulam beam where the GFRP layer was placed over the tension zone by a low ratio of 1.07 and 1.6%. Their test results showed an average improvement of 12.1 to 14.7% in stiffness, while the moment capacity increased to 23%.…”

Section: Glass Fibre-reinforced Polymer (Gfrp)mentioning

confidence: 99%

Flexural Performance of Strengthened Glued Laminated (GLULAM) Timber Beam Using Glass Fibre-Reinforced Polymer (GFRP)

Zamli

Hassan

Sidek

et al. 2021

Green Infrastructure

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Several reinforcement applications using glass fibre-reinforced polymer (GFRP) as strengthening material show greater structural strength without an increase of its dimensions. Though reinforcement is proven to be workable, there is minimal understanding of the optimum area should the GFRP be used in strengthening. This research aims to investigate this issue by testing the GFRP strengthening of glulam beams with a dimension of 80 mm x 140 mm x 3000 mm under four-point flexural loading. Three (3) specimens of each made for control, and three different areas covered by GFRP, are 30% (G30), 40% (G40), and 50% (G50), respectively. Results

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Internal reinforcement of laminated duo beams of low-grade timber with GFRP sheets

Cited by 26 publications

References 20 publications

Internal GFRP Reinforcement of Low-Grade Maritime Pine Duo Timber Beams

Internal GFRP Reinforcement of Low-Grade Maritime Pine Duo Timber Beams

The Influence of CFRP Sheets on the Load-Bearing Capacity of the Glued Laminated Timber Beams under Bending Test

Flexural Performance of Strengthened Glued Laminated (GLULAM) Timber Beam Using Glass Fibre-Reinforced Polymer (GFRP)

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