Assessment of the flexural behavior of continuous RC beams strengthened with NSM-FRP bars, experimental and analytical study

Abdallah, Mohammad; Mahmoud, Firas Al; Khelil, A.; Mercier, Julien; Almassri, Belal

doi:10.1016/j.compstruct.2020.112127

Cited by 64 publications

(25 citation statements)

References 29 publications

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“…e former two methods are mostly applied to newly built structures, and the latter method is the most common technique for external prestressed reinforcement owing to its advantages of light weight and convenient construction. [37]. NSM FRP reinforcement involves placing FRP bars or laminates into precut grooves on the surface of the concrete members with the corresponding binder.…”

Section: Strengthening With Prestressing Frp Barsmentioning

confidence: 99%

“…Reinforced beams strengthened with NSM FRP bars exhibited lower ductility than the unreinforced members. e displacement coefficients of the reinforced beams were reduced by 31.3%-66.7% [37]. e energy ductility coefficient is calculated using the amount of deformation energy absorbed, according to the load-deflection curve or load-curvature curve.…”

Section: Ductilitymentioning

confidence: 99%

“…In addition, strengthening with FRP bars or using FRP sheets can increase the flexural performance of reinforced concrete members [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

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Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Yuan

2020

Advances in Materials Science and Engineering

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In recent years, fiber-reinforced polymer (FRP) composites have been widely used as a new type of high-performance material in concrete structures. FRP composites have the advantages of high strength, light weight, and corrosion resistance. Based on existing studies in the literature, this paper reviews the development and applications of FRP materials for the strengthening and rehabilitation of bridge structures. The types and properties of FRP composites are summarized, and the applications and development of FRP sheets, FRP bars, FRP grids, and prestressed FRP tendons for bridge structures are discussed. Different types of FRP composites result in different failure characteristics and bearing capacities. Moreover, this paper covers the FRP strengthening methods and the response properties of the flexural performance, bonding performance, and ductility. Significant conclusions regarding the strengthening/repair of bridge structures with FRP composites are presented. The review details the current state of knowledge and research on strengthening bridge structures with FRP composites and is helpful for better understanding and establishing design criteria.

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Section: Strengthening With Prestressing Frp Barsmentioning

confidence: 99%

Section: Ductilitymentioning

confidence: 99%

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Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Yuan

2020

Advances in Materials Science and Engineering

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“…The brittleness of FRP rebars would raise concerns around their ability to redistribute moments in continuous beams. While extensive works on continuous FRP RCBs have been performed [ 26 , 27 , 28 , 29 , 30 , 31 , 32 ], the effect of adopting FRP rebars instead of those made of steel on moment redistribution in continuous externally PCBs has not yet been addressed.…”

Section: Introductionmentioning

confidence: 99%

Moment Redistribution in Continuous Externally CFRP Prestressed Beams with Steel and FRP Rebars

Lou

Pang

2021

Polymers

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This paper assesses the impact of adopting carbon- or glass-fiber-reinforced polymer (CFRP or GFRP) instead of steel rebars on the redistribution of moments in prestressed concrete beams (PCBs) with external CFRP tendons. A numerical program is introduced, and numerical simulations are performed on two-span continuous beams with steel, CFRP or GFRP rebars of various areas, i.e., Ar2 = 360–3560 mm2, and Ar1/Ar2 = 1.5, where Ar1 and Ar2 are areas of tensile rebars over the positive and negative moment zones, respectively. The results show the moment redistribution is contributed by concrete cracking only for the beams with fiber-reinforced polymer (FRP) rebars, and by concrete cracking and steel yielding for the beams with steel rebars. As a result, the use of FRP rebars leads to a substantially lower moment redistribution than in steel rebars. It is also demonstrated that Eurocode 2, CSA A23.3-04 and ACI 318-19 fail to reflect the rebar influence on moment redistribution in PCBs with external tendons. A simplified equation for the quantification of moment redistribution in externally PCBs with steel and FRP rebars is recommended, which yields accurate and conservative predictions.

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“…The FRP is commonly applied using Near-Surface Mounted (NSM) which involves the introduction of FRP rods or strips into the surface grooves. These are usually cut along the concrete's cover through the process of flexural strengthening [5][6][7] on the tension side or shear strengthening [8,9] in the web to ensure an increment in the load-carrying capacity. This method is beneficial due to the ease with which it can be installed, better bonding in comparison with the conventional method, provide more protection from natural hazards, and ensure the structure is less exposed to accidental damage [10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear 3D Model of Double Shear Lap Tests for the Bond of Near-surface Mounted FRP Rods in Concrete Considering Different Embedment Depth

Haryanto

Lie

et al. 2021

Period. Polytech. Civil Eng.

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The utilization of near-surface mounted Fiber Reinforced Polymer (FRP) reinforcement as a method of strengthening in reinforced concrete structures has increased considerably in recent years. Moreover, the application of double-shear lap tests for this rein-forcement method leads to the achievement of a local bond-slip behavior in a bonded joint. This research, therefore, focused on 3-D modeling of this type of test to suitably characterize the bond mechanics between FRP rods and concrete at various embedment depth. The use of different alternatives to represent the interface between the FRP rod and concrete were analyzed after which a comparison was drawn between the numerical finite element (FE) simulations and experimental measurements. The results showed the prediction of the load–slip corresponded with the data obtained from the experiment. Finally, the proposed model has the ability to express the relationship between the penalty stiffness parameters in shear direction Kss = (Ktt) and the embedment depth of FRP rods.

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Assessment of the flexural behavior of continuous RC beams strengthened with NSM-FRP bars, experimental and analytical study

Cited by 64 publications

References 29 publications

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Moment Redistribution in Continuous Externally CFRP Prestressed Beams with Steel and FRP Rebars

Nonlinear 3D Model of Double Shear Lap Tests for the Bond of Near-surface Mounted FRP Rods in Concrete Considering Different Embedment Depth

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