Inverse analysis based on DFOS technology for the study of the bonding behaviour of FRP to concrete beams

Armonico, Andrea; Saïdi, Mohamed; Michel, Laurent; Bel, Sylvain; Ferrier, Emmanuel

doi:10.1016/j.mtcomm.2023.105655

Cited by 3 publications

(2 citation statements)

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“…The bond length of the strengthening reinforcement plays a crucial factor in enhancing the structural responses of the structural elements in both EBR and NSM methods [44][45][46]. Hence, the variation of bonded length from 1600 mm to 1900 mm of the CFRP (rebars and plates) reinforcement for strengthening RC beams was executed in this SH technique for the evaluation of flexural responses.…”

Section: Strengthening Proceduresmentioning

confidence: 99%

Carbon Fiber Reinforced Polymer (CFRP) for Structural Capacity Enhancement of RC Beams Incorporating Innovative Side Hybrid (SH) Technique

Hosen,

Shammas,

Kaaf

et al. 2024

Buildings

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Reinforced concrete (RC) infrastructure is an essential part of modern civilization. However, the serviceability of RC infrastructure in extreme weather has become challenging due to the susceptibility of the initiation of cracks. Hence, the demand for strengthening and retrofitting RC infrastructure is rapidly increasing. The RC specimens strengthened with existing externally bonded reinforcement (EBR) and near-surface mounted (NSM) techniques; however, they suffered a prematurely brittle or debonding failure. Hence, the merging of side near surface mounting (SNSM) and side externally bonded reinforcement (S-EBR) methods ended up resulting in the development of an innovative side hybrid (SH) strengthening approach that is designed to overcome these drawbacks. In this investigation, six rectangular RC beam specimens were flexurally strengthened utilizing carbon fiber-reinforced polymer (CFRP) with the SH technique, and then four-point bending experiments were performed to failure. The beam specimens were categorized into two types: (I) control specimens and (II) specimens strengthened with the SH technique applying CFRP varying bonded length from 1600 mm to 1900 mm. The initial cracking, yield, and ultimate load-bearing capabilities, deflection, failure modes, cracking characteristics, stiffness, energy absorption capacity, and strain on the utmost fiber of concrete, the tensile strain of major steel rebars, SNSM bars, and S-EB plates were assessed from the experimental investigation. The SH technique substantially improved the flexural performance of the beam specimens. The initial cracking load, yield, and ultimate load-bearing capabilities were enhanced remarkably by 387%, 108%, and 163%, respectively, over the reference specimen. The flexural stiffness and energy absorption capacity substantially improved by 120% and 103%, respectively, compared with the reference specimen.

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Section: Strengthening Proceduresmentioning

confidence: 99%

Carbon Fiber Reinforced Polymer (CFRP) for Structural Capacity Enhancement of RC Beams Incorporating Innovative Side Hybrid (SH) Technique

Hosen,

Shammas,

Kaaf

et al. 2024

Buildings

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“…The main advantage of using DIC over more traditional methods is the capacity to measure full field strains instead of strains at local points, which has been enhanced by providing the measurements of various specimens of FRP materials [20]. The reported strain fields are examples of what were obtained during an experimental campaign to understand the behavior of strengthened beams using externally bonded CFRP [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Steel Reinforcement Ration on the Cracking Behaviour of FRP-Strengthened RC Elements

Armonico,

Michel,

Saidi

et al. 2024

Buildings

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This paper examines the cracking behaviour of reinforced concrete beams strengthened by externally bonded fiber-reinforced polymer. The crack opening of RC structures is a key parameter for the durability of concrete structures. It is of vital importance for designers to be able to make correct estimations of the crack opening values of strengthened structures. FRP strengthening affects the cracking behaviour of RC beams with different steel percentages. Beams have been tested under four-point bending mechanical tests until failure with three steel ratios and two layers of externally bonded wet carbon fibers (CFRP). In order to measure the crack opening during loading, Digital Image Correlation is used to obtain the crack opening along the beam during load functioning. The results allow for a comparison of the RC beams with and without FRP and enhance the effect of FRP on crack opening. The crack width was compared with the theoretical values obtained based on the relation proposed by Eurocode 2 (EC2). The comparison enhanced the need to propose a modified relation. Subsequently, an empirical model was established as a modification of EC2, considering the presence of a CFRP system. The corresponding results were compared and discussed to validate the model. For the same level of loads, the crack opening can be reduced by 20 to 50% depending on the level of steel ratio.

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Fibre Optic‐Based Patch Sensor for Crack Monitoring in Concrete Structures

de Souza Gomes,

Saidi,

Lushnikova

et al. 2024

Strain

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In the context of the necessity to monitor civil engineering structures for accident prevention, this paper presents the performance of an innovative optical fibre patch sensor that can be embedded or glued on the concrete's surface. The sensor is composed of a fabric comprising an optical fibre network. When employed in concrete structures, it is capable of detecting opening cracks in the order of 0.01 mm, thereby satisfying the regulatory standards for limit states (Eurocode 2). This sensor is capable of accurately tracking the evolution of crack, including cyclic changes, by sensing both the increase and decrease in crack width. The procedure outlined in this paper includes a preliminary investigation into the influence of fibre diameter and density within the patch, which has revealed that fibres of 750 μm in diameter exhibit optimal performance, as well as the attachment method to concrete surfaces. Subsequently, the process of calibration is detailed, followed by numerous laboratory tests that were conducted on reinforced concrete samples of varying sizes. Comparisons and validations of optical fibre patch sensor measurements were performed using digital image correlation, resulting in a sensitivity of the sensors reaching 0.01 mm/K, and an accuracy ranging between 0.1% and 1%. The discussion within this paper considers the installation of this new sensor both externally and internally within real reinforced concrete structures.

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Inverse analysis based on DFOS technology for the study of the bonding behaviour of FRP to concrete beams

Cited by 3 publications

References 64 publications

Carbon Fiber Reinforced Polymer (CFRP) for Structural Capacity Enhancement of RC Beams Incorporating Innovative Side Hybrid (SH) Technique

Carbon Fiber Reinforced Polymer (CFRP) for Structural Capacity Enhancement of RC Beams Incorporating Innovative Side Hybrid (SH) Technique

Experimental Study on the Effect of Steel Reinforcement Ration on the Cracking Behaviour of FRP-Strengthened RC Elements

Fibre Optic‐Based Patch Sensor for Crack Monitoring in Concrete Structures

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