Creep response of intermediate flexural cracking behavior of reinforced concrete beam strengthened with an externally bonded FRP plate

Hadjazi, K.; Sereir, Z.; Amziane, Sofiane

doi:10.1016/j.ijsolstr.2016.04.012

Cited by 24 publications

(10 citation statements)

References 29 publications

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“…The existing IC debonding prediction models of FRP-strengthened plain concrete beams based on the CZM all derive the interface shear stress distribution law by defining a nonlinear interface bond-slip relationship (Wang, 2006a;Wang, 2006b;Chen and Qiao, 2009;Hadjazi et al, 2012;Houachine et al, 2013;Hadjazi et al, 2016;Bennegadi et al, 2016); thus, the bond slip curve (τ δ − curve for short, whereτ is the Interfacial shear stress and δ is the relative size of the slip) plays an important role in the prediction of IC debonding. The constitutive relation of the FRP-concrete interface is described by the bilinear model ( Figure 5), which is widely used to define the interface behavior of FRP-strengthened RC beams due to it being convenient for use and accurate prediction of interface debonding (Liu et al, 2007;Faella et al, 2008;Shukri et al, 2018;Razaqpur et al, 2020).The constitutive equations for the slip law expressed by the following equations:…”

Section: Bond-slip Law Of Frp-concrete Interfacementioning

confidence: 99%

“…After determining the relationship between the spring rotation stiffness and the interface bond-slip relationship, the debonding between FRP and concrete can be analyzed by nonlinear fracture mechanics method, which takes into account the coupling effect of several parameters. Although such models have been continuously improved in the past 10 years (Bennegadi et al, 2016;Chen and Qiao, 2009;Hadjazi et al, 2012;Houachine et al, 2013;Hadjazi et al, 2016), these analytical model is always created to quantitatively analyze the relationship between interface shear stress and the debonding failure of the FRP-strengthened linear elastic pre-cracked plain concrete beams. In such studies, the flexural cracks are pre-set before loading begins, and the effect of steel reinforcement and the nonlinear behavior of the strengthened beam are not considered.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Zhang

Guo

et al. 2020

Lat. Am. j. solids struct.

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Intermediate crack (IC) debonding failure is one of the common bending failure forms of fiber-reinforced polymer (FRP)-strengthened reinforced concrete (RC) beams. In this paper, a new prediction model for IC debonding in FRP-strengthened RC beams is proposed based on fracture mechanics and cohesive zone model (CZM), which takes into account the coupling effect of many parameters and has the advantages of high precision and simple expression. The nonlinear behavior of FRP-strengthened RC beams and the influence of flexural cracks are reasonably considered in this model, whereas all existing analytical models based on the CZM neglect this effects. To verify the accuracy of this model, we established a database containing 248 test data from the existing literature. By comparing the differences between the predicted and experimental results, we analyzed the causes of the error and established a semiempirical model. To test the reliability of the model, it is evaluated using the database constructed in this paper together with four representative strength models. The results show that the semiempirical model has a high accuracy.

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Section: Bond-slip Law Of Frp-concrete Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Zhang

Guo

et al. 2020

Lat. Am. j. solids struct.

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“…When debonding problems could be overcome, FRP external reinforcement has the potential of even better load-carrying capacity, stiffness, and ductility enhancement. The compatibility between the two materials depends strongly on their mechanical properties, i.e., the stress-strain constitutive behavior in tension and compression, the Poisson's ratio and the ultimate strength and strain [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Failure Behavior of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Reinforced Concrete T-beams

Utomo

Khusyeni

Partono

et al. 2021

ced

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Carbon Fiber Reinforced Polymers (CFRP) are widely used as external concrete reinforcement. The behavior of T-beams strengthened in shear and flexure using CFRP sheets and plates was studied to analyze the load carrying capacity and failure mode as compared to conventional concrete members. The bonding response of the plate-to-concrete was investigated by comparing a specimen with a plate anchored at the far ends, one without anchoring. The sheets were in situ wet lay-up, the plate was pre-impregnated and pultruded during manufacturing. The test result suggested that this integrated strengthening method notably improved the load-carrying capacity, it was also demonstrated that anchoring had a positive but insignificant effect on the moment capacity and deformation. The influence of anchoring was noteworthy from the point of view that it shifted the failure mode from debonding to CFRP plate rupture. The most important factors influencing the behavior of CFRP strengthened beams are outlined.

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“…In recent years, using fiber-reinforced polymer (FRP) materials for strengthening concrete structures experienced very rapid growth around the world [5], particularly in cases of design code changes,…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Investigation on Flexural Retrofitting of RC T-Section Beams Using CFRP Sheets

Zhang

Nehdi

2020

Applied Sciences

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The large portfolio of aging highway bridges worldwide includes many reinforced concrete T-section beams with various levels of damage and degradation. However, there is currently dearth of research on the anchoring behavior of CFRP sheets used for strengthening such RC T-section beams. Moreover, there is a need for rational and accurate analytical models to predict the strengthening effect of CFRP sheets for RC T-section beams. In this study, eight RC T-section beam specimens strengthened with externally bonded CFRP sheets were tested under quasi-static loading. The failure mode, cracking resistance, yielding and ultimate capacity were examined. The effects of U-wrap spacing, flexural reinforcing ratio, and concrete compressive strength on the flexural behavior of the CFRP strengthened RC T-section beams were analyzed and discussed. New analytical models were developed to predict the cracking, yielding and ultimate load resistance of the RC T-section beams strengthened with CFRP sheets. The analytical models were validated through comparing its predictions with experimental results, and they demonstrated adequate accuracy. The findings could be deployed for the retrofitting of a large portfolio of aging highway bridges with deteriorated reinforced concrete T-section beams.

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Creep response of intermediate flexural cracking behavior of reinforced concrete beam strengthened with an externally bonded FRP plate

Cited by 24 publications

References 29 publications

Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Experimental Investigation on the Failure Behavior of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Reinforced Concrete T-beams

Experimental and Analytical Investigation on Flexural Retrofitting of RC T-Section Beams Using CFRP Sheets

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