Bond strength model for externally bonded FRP-to-timber interface

Vahedian, Abbas; Shrestha, Rijun; Crews, Keith

doi:10.1016/j.compstruct.2018.05.152

Cited by 22 publications

(11 citation statements)

References 37 publications

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“…Debonding occurs when the tensile stress at the interface exceeds the bond strength, and it prevents the strain from being transmitted from the wood to the composite fibres, which prevents the full utilization of the FRP strength; also, the structural member will not attain the desired ductility [74]. Different parameters can affect the bond strength such as the characteristics of the wood [75][76][77], moisture content [78], prestressing [56], surface preparation [79], the adhesive and temperature [80,81], the bond and the FRP geometrical and material properties [82], the boundary conditions [83], the bond length (the effective bond length must be taken into consideration) [84,85], the proportion of FRP to substrate width [86].…”

Section: Cfrp-wood Bond Characteristicsmentioning

confidence: 99%

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Strengthening Timber Structural Members with CFRP and GFRP: A State-of-the-Art Review

Saad

Lengyel

2022

Polymers

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The application of fibre-reinforced polymers (FRP) for strengthening timber structures has proven its efficiency in enhancing load-bearing capacity and, in some cases, the stiffness of structural elements, thus providing cost-effective and competitive alternatives both in new design and retrofitting existing historical buildings. Over the last few decades, several reinforcing materials and techniques evolved, and considerable progress was made in numerical modelling, especially using the finite element method. As this field of research has become extensive and diversified, as well as numerous contradicting results have emerged, a thorough review is necessary. This manuscript covers the topics of historical preliminaries, reinforcing with carbon and glass fibre composites, bond characteristics, main reinforcing techniques, modelling of knots, and the effects of the fibre waviness on the composite behaviour. A detailed overview is given on the experimental and numerical investigation of mechanics of strengthened beams. A one-of-a-kind table that compares the stiffness improvement observed in several studies with analytical estimates. Attention is drawn to a number of challenges that have arisen, e.g., the moderate stiffness enhancement, composite-to-wood interface, modelling of knots, and strengthening of defected timber members. This paper can be used as a starting point for future research and engineering projects.

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Section: Cfrp-wood Bond Characteristicsmentioning

confidence: 99%

“…The bond strength was proportional to the FRP plate width, and the local slip at the same load level reduces as the FRP-to-timber width ratio increases. It was stated that the bond strength was enhanced as a result of the hardwood species' higher tensile strength [85].…”

Section: Cfrp-wood Bond Characteristicsmentioning

confidence: 99%

Strengthening Timber Structural Members with CFRP and GFRP: A State-of-the-Art Review

Saad

Lengyel

2022

Polymers

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“…In most cases, the local bond-slip relationship is obtained by testing the entire bond length of [46] the FRP-wood joint with the strain gauge attached to the FRP composite. Vahedian et al [48] conducted bond strength tests on 136 specimens produced using two types of wood with different FRP layers, varying bond lengths and widths. They proposed a new theoretical model to predict the bond performance based on the obtained test results, as shown in Fig.…”

Section: Bond-slip Relationship Modelmentioning

confidence: 99%

A Review on Strengthening of Timber Beams Using Fiber Reinforced Polymers

Jian¹,

Cheng²,

Li³

et al. 2022

Journal of Renewable Materials

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Fiber reinforced polymer (FRP) has been used in the construction industry because of its advantages such as high strength, light weight, corrosion resistance, low density and high elasticity. This paper presents a review of bonding techniques adopted to strengthen timber beams using FRP to achieve larger spans. Different methods of bonding between FRP and timber beams have been summarized with a focus on the influencing factors and their effects as well as relevant bond-slip models proposed for fundamental understanding. Experimental investigations to evaluate the flexural performance of timber beams strengthened by FRP bars, sheets and wraps have also been critically reviewed to identify key influencing parameters. Limited research available on the shear performance of FRP reinforced timber beams have been analyzed to determine the influencing factors of the shear performance in timber-FRP beams. The paper finally presents an overall summary of the current-state-of-the-art and proposes some future research directions in the field.

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“…Vessby [ 8 ], Wan [ 9 , 10 ], Biscaia [ 11 ], Subhani [ 12 ] and Vahedian [ 13 , 14 , 15 , 16 , 17 ] examined the strain’s redistribution in a single-lap joint between the wood and the CFRP plate ( Figure 3 a). Vessby [ 8 ] performed numerical modelling, while Biscaia [ 11 ] and Vahedian [ 14 ] proposed an analytical solution. Biscaia [ 18 ] extended the research with another double-lap scheme ( Figure 3 b).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Glue Cohesive Stiffness on the Elastic Performance of Bent Wood–CFRP Beams

Kawecki

Podgórski

2020

Materials

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This paper presents experimental, theoretical and numerical studies of wood-CFRP beams bonded with polyurethane (PUR) adhesive. The analyses include two types of CFRP (carbon fibre-reinforced polymer) strengthening configurations and pure glue laminated timber beams as a reference. Through detailed analyses of a double-lap connection on blocks with and without CFRP strips, the authors state that neglecting the cohesive stiffness of adhesive layers may lead to an overestimation of an overall beam’s stiffness. This is significant with wood–CFRP connections, which showed values two times lower than with wood–wood connections. Theoretical modelling of the equivalent area used in a theory of composites provided much stiffer behaviour of the beams than in laboratory experiments. It proves that a PUR glue eliminates the possibility of using simple models that assume a perfect connection between bonded parts. These conclusions led the authors to use the finite element method (FEM) to take into account the cohesive stiffness. The FEM, based on the properties obtained from a double-lap joint analysis, allowed for the precise prediction of the elastic stiffness of the beams.

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Bond strength model for externally bonded FRP-to-timber interface

Cited by 22 publications

References 37 publications

Strengthening Timber Structural Members with CFRP and GFRP: A State-of-the-Art Review

Strengthening Timber Structural Members with CFRP and GFRP: A State-of-the-Art Review

A Review on Strengthening of Timber Beams Using Fiber Reinforced Polymers

The Effect of Glue Cohesive Stiffness on the Elastic Performance of Bent Wood–CFRP Beams

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