Deflection Prediction for FRP-Strengthened Concrete Beams

Said, Hemdan

doi:10.1061/(asce)cc.1943-5614.0000069

Cited by 11 publications

(5 citation statements)

References 6 publications

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“…Therefore, the midspan deflection of RC beam specimens in this study was estimated [36] using the following equation: Δ=(P/2)La24EcIe(3L2−4La2) where, Δ is the deflection at midspan, P is the predicted load, L is the total span length and L a is the shear span length.…”

Section: Analytical Studymentioning

confidence: 99%

Near Surface Mounted Composites for Flexural Strengthening of Reinforced Concrete Beams

et al. 2016

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Existing structural components require strengthening after a certain period of time due to increases in service loads, errors in design, mechanical damage, and the need to extend the service period. Externally-bonded reinforcement (EBR) and near-surface mounted (NSM) reinforcement are two preferred strengthening approach. This paper presents a NSM technique incorporating NSM composites, namely steel and carbon fiber-reinforced polymer (CFRP) bars, as reinforcement. Experimental and analytical studies carried out to explore the performance of reinforced concrete (RC) members strengthened with the NSM composites. Analytical models were developed in predicting the maximum crack spacing and width, concrete cover separation failure loads, and deflection. A four-point bending test was applied on beams strengthened with different types and ratios of NSM reinforcement. The failure characteristics, yield, and ultimate capacities, deflection, strain, and cracking behavior of the beams were evaluated based on the experimental output. The test results indicate an increase in the cracking load of 69% and an increase in the ultimate load of 92% compared with the control beam. The predicted result from the analytical model shows good agreement with the experimental result, which ensures the competent implementation of the present NSM-steel and CFRP technique.

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Section: Analytical Studymentioning

confidence: 99%

Near Surface Mounted Composites for Flexural Strengthening of Reinforced Concrete Beams

et al. 2016

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“…The behaviour of a reinforced concrete beam subjected to bending can be schematized as shown in Fig. 12, [26]. Where the deformation force curve can be divided into three parts:…”

Section: Analytical Studymentioning

confidence: 99%

“…The Force and the deformation (P cr , ∆ cr ) representing this phase were calculated from the neutral axis y cr according to the balance of the static moments of the section. The moments Mcr and the inertia of the section Icr were calculated according to the transformed section method [26]:…”

Section: A-non-cracked Section 0< M< Mcrmentioning

confidence: 99%

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Modeling of CFRP strengthened RC beams using the SNSM technique, proposed as an alternative to NSM and EBR techniques

Boulebd

Ferhoune

Mohcene

et al. 2020

Frattura Ed Integrità Strutturale

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In this paper, an analytical and numerical study in FEM finite element by the ABAQUS software was conducted. Which aims to study the behaviour of RC beams bending strengthened with SNSM side near surface mounted technique, proposed as a solution to avoid the failure mode by debonding of the strengthening, the disadvantage of the EBR externally bonded reinforced technique, and the failure mode by separation of the concrete cover relative to the NSM near surface mounted technique, by comparing the behaviour of the three techniques, the effect of the quantity of strengthening and confirm the results with the literature. The results of this study show that the numerical and analytical model can predict the behaviour of strengthened RC beams according to the three techniques, a clear improvement of the bending capacity of beams strengthened is noticed. A good preservation of the ductility of SNSM beams with a better failure mode.

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“…ACI440.2R-02 [1], El-Mihilmy and Tedesco [2], Charkas et al [3], Faruqi et al [4], and Said [5] proposed different formulae to evaluate the deflection of FRP-strengthened RC beams. However, these methods do not accurately represent the behavior of RC beams strengthened under complex conditions.…”

Section: Introductionmentioning

confidence: 99%

Deflection Prediction of FRP-Strengthened Reinforced Concrete Beams

Guo

2011

AMR

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Bonding fiber reinforced polymer (FRP) laminates to the tension face of RC members has been proven to be an effective method to improve the flexural strength. However, structural members are not only needed to have adequate strength, but also to have adequate performance of deformation at service load levels. To evaluate the deflection of externally FRP-strengthened RC beams, a total of 18 RC beams, including 16 beams strengthened with CFRP laminate under different preload levels and 2 control beams, were tested. Based on the assumption that the section of the beam behaves a tri-linear moment-curvature response characterized by pre-crack stage, post-crack stage and failure stage and the test results, this paper presents a modified model to evaluate the deflection of CFRP-strengthened RC beams. The present modified model was verified by the similar test results, and shows a good agreement with the test results.

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Deflection Prediction for FRP-Strengthened Concrete Beams

Cited by 11 publications

References 6 publications

Near Surface Mounted Composites for Flexural Strengthening of Reinforced Concrete Beams

Near Surface Mounted Composites for Flexural Strengthening of Reinforced Concrete Beams

Modeling of CFRP strengthened RC beams using the SNSM technique, proposed as an alternative to NSM and EBR techniques

Deflection Prediction of FRP-Strengthened Reinforced Concrete Beams

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