Composite reinforcement of timber in bending

Johns, Kenneth C.; Racine, Paschal

doi:10.2749/222137801796349051

Cited by 9 publications

(7 citation statements)

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“…Experimental campaigns to investigate the reinforcement of solid timber beams and glulam with CFRP reinforcement by several researchers [43]- [47] have demonstrated that the use of a small percentage of reinforcement in the order of 1.5-2.5% can result increases in the bending strength and stiffness of up to 90% and 100%, respectively. In addition, reinforced beams were shown to have less variability in their properties than unreinforced beams.…”

Section: Bending Reinforcementmentioning

confidence: 99%

FRP reinforcement of timber structures

Schober

Harte

Kliger

et al. 2015

Construction and Building Materials

149

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Timber engineering has advanced over recent decades to offer an alternative to traditional materials and methods. The bonding of fibre reinforced plastics (FRP) with adhesives to timber structures for repair and strengthening has many advantages. However, the lack of established design rules has strongly restrained the use of FRP strengthening in many situations, where these could be a preferable option to most traditional techniques. A significant body of research has been carried out in recent years on the performance of FRP reinforced timber and engineered wood products. This paper gives a State of the Art summary of material formulations, application areas, design approaches and quality control issues for practical engineers to introduce on-site bonding of FRP to timber as a new way in design for structural repair and rehabilitation.

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Section: Bending Reinforcementmentioning

confidence: 99%

FRP reinforcement of timber structures

Schober

Harte

Kliger

et al. 2015

Construction and Building Materials

149

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“…Among those that can be cited are those carried out by Plevris and Triantafillou [9] and by Triantafillou [10] dealing with external carbon strengthening (CFRP) in the presence of flexure and shear loads on small dimension samples; by Johns and Lacroix [11] on samples 39x89x1675 mm, strengthened with various FRP patterns; by Borri et al [12,13] on wood beams strengthened using CFRP sheets and bars; by Gentile et al [14], by Fiorelli and Alves Dias [15], Alam et al [16].…”

Section: Introductionmentioning

confidence: 99%

Strengthening of timber beams with high strength steel cords

Borri

Corradi

2011

Composites Part B: Engineering

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ABSTRACT:This paper presents an experimental study on the strengthening of wood beams under bending loads through the use of very high strength steel cords. The study also presents the results of 21 double shear push-out tests conducted to determine the strength of Steel fiber Reinforced Polymers (SRP) bonded to wood prisms. An experimental programme based on a four-point bending test configuration is proposed to characterize the stiffness, ductility and strength response of strengthened wood beams. Mechanical tests on the strengthened wood showed that external bonding of steel fibers produce high increases in flexural stiffness and capacity. Finally experiment results are used to calibrate existing analytical formulations for capacity prediction. This economic and effective technique may be an interesting alternative to glass or carbon fibres or other expensive retrofitting methods.

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“…Even though these solutions were efficient, they highly increased the structure's weight. Nowadays, composite materials such as fiber reinforced polymers (FRP) come as a new option in order to improve structural capacity and stiffness of timber structures (Triantafillou 1998;Johns and Lacroix 2000;Lopez-Anido and Xu 2002;Radford et al 2002;Borri et al 2005;Buell and Saadatmanesh 2005;Yail and Kent 2010).…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic properties of retrofitted timber beams using glass fiber reinforced polymers

et al. 2014

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Abstract:A study on the static and dynamic properties of sawn timber beams reinforced with glass fiber-reinforced polymer (GFRP) is reported in this paper. The experimental program is focused on the behavior of unidirectional wooden slabs, and the main objective is to fulfill the service state limit upon vibrations using GFRP when an architectonical retrofitting project is necessary. Two different typologies of reinforcement were evaluated on pine wood beams: one applied the composite only on the lower side of the beams, while the other also covered half of the beams depth. For the dynamic characterization, the natural frequency, damping ratio, and dynamic elastic modulus were measured using two different techniques: experimental modal analysis upon the whole beams; and bandwidth method using smaller samples of the same material. The static characterization consisted on four point bending tests, where elastic modulus, bending strength and ductility were assessed. The lower composite had better ductility and bending strength. On the other hand, the U-shaped laminate showed higher stiffness but also at a higher material cost. However, it allowed some ductility, i.e. compressive plasticity, even in the presence of hidden knots. Both dynamic techniques gave similar results and were capable of measuring the structure stiffness, even if short samples were used. Finally, the changes on dynamic properties because of the GFRP did not jeopardize the dynamic performance of the reinforced timber beams. fiber-reinforced polymer (GFRP) is reported in this paper. The experimental program is focused on the behavior of unidirectional wooden slabs, and the main objective is to fulfill the service state limit upon vibrations using GFRP when an architectonical retrofitting project is necessary. Two different typologies of reinforcement were evaluated on pine wood beams: one applied the composite only on the lower side of the beams, while the other also covered half of the beams depth. For the dynamic characterization, the natural frequency, damping ratio, and dynamic elastic modulus were measured using two different techniques: experimental modal analysis upon the whole beams; and bandwidth method using smaller samples of the same material. The static characterization consisted on four point bending tests, where elastic modulus, bending strength and ductility were assessed. The lower composite had better ductility and bending strength. On the other hand, the U-shaped laminate showed higher stiffness but also at a higher material cost. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems CorporationHowever, it allowed some ductility, i.e. compressive plasticity, even in the presence of hidden knots. Both dynamic techniques gave similar results and were capable of measuring the structure stiffness, even if short samples were used. Finally, the changes on dynamic properties because of the GFRP did not jeopardize the dynamic performance of the reinforced timber beams.

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Composite reinforcement of timber in bending

Cited by 9 publications

References 0 publications

FRP reinforcement of timber structures

FRP reinforcement of timber structures

Strengthening of timber beams with high strength steel cords

Static and dynamic properties of retrofitted timber beams using glass fiber reinforced polymers

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