Experimental Study on Dynamic Behavior of CFRP-to-Concrete Interface

Huo, Jingsi; Liu, Jingya; Dai, Xiaogan; Jin, Yang; Lü, Yuan; Xiao, Yan; Monti, Giorgio

doi:10.1061/(asce)cc.1943-5614.0000677

Cited by 28 publications

(9 citation statements)

References 36 publications

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“…Under static loads, the debonding process of the CFRP strips usually occurs with a thin layer of concrete [13,37] attached to the CFRP strip because concrete is expected to fail first as the epoxy strength is superior. Moreover, a dynamic increase factor at the interface between concrete and CFRP strip should be included due to the strain rate effect of the blast loading [38,39]. Based on this approach, a tiebreak contact algorithm is used to model the contact between the concrete and the CFRP strip in the most accurate way.…”

Section: Contact Algorithm Between Cfrp Strips and Concretementioning

confidence: 99%

Finite element modelling of RC slabs retrofitted with CFRP strips under blast loading

Maazoun

Matthys

Atoui

et al. 2022

Engineering Structures

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This paper presents nonlinear finite element (FE) simulations to predict the structural behavior of simply supported reinforced concrete (RC) slabs retrofitted with carbon fiber reinforced polymer (CFRP) as externally bonded reinforcement (EBR) and subjected to the blast loads in order to evaluate the effectiveness of using the CFRP strips as EBR for blast protection. The objective of this paper is to develop detailed numerical models in order to predict the blast response of non-retrofitted and retrofitted RC slabs during the inbound and rebound phases. A plastic material model including the strain rate effects of the material and able to predict the cracks is used to model the concrete. An elasto-plastic material model and an elastic material model are used to model the steel reinforcement and the CFRP strips, respectively. The bond interface between concrete and CFRP strip is simulated using a special contact algorithm including the strain rate effect at the interface between concrete and CFRP strip with failure criteria. The numerical results are validated by experimental tests. The maximum deflections, crack distribution and strain evolution in the steel reinforcement and in the CFRP strips found by the numerical analysis are in good agreement with the experiments. The concrete material model gives a good prediction of the blast response of the RC slab with and without EBR. Increasing the amount of the CFRP strip reduces the maximum deflection at the mid span of the slabs and the strain distribution in the steel reinforcement and in the CFRP strip. Parametric studies with respect to CFRP width and CFRP thickness are performed in order to evaluate the effects on the blast response of the RC slabs.

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Section: Contact Algorithm Between Cfrp Strips and Concretementioning

confidence: 99%

Finite element modelling of RC slabs retrofitted with CFRP strips under blast loading

Maazoun

Matthys

Atoui

et al. 2022

Engineering Structures

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“…That is why 45° inclined wrapping of FRP sheets yields better performance than U-wrapped RC members [69]. Impact loading changes the strain distribution, which has a wide gradient, and the loading rate greatly influences the bond strength of the FRPconcrete interface [70,71]; however, the failure mode and ductility of the strengthened structure do not directly depend on the loading rate.…”

Section: Impact Behaviourmentioning

confidence: 99%

Performances, challenges and opportunities in strengthening reinforced concrete structures by using FRPs – A state-of-the-art review

Siddika

Mamun

Ferdous

et al. 2020

Engineering Failure Analysis

141

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“…The tensile strain energy of epoxy 2 2 a a f E , which is represented as the area under the tensile stress-strain curves of the epoxy was incorporated into the proposed model. The testing data from the existing studies [20,[46][47][48][49] and the testing data from this study were employed to conduct the regression analysis. Table 3 summarizes the specimen details and the test results.…”

Section: Interfacial Fracture Energymentioning

confidence: 99%

“…As FRP debonding has been observed in many tests, e.g., the field blast tests conducted by Lee et al [4], it is necessary to quantitatively study dynamic interfacial bond behaviour between FRP and FRC at different strain rates. So far, very limited studies have been conducted to investigate the strain rate effect on the interfacial bond behaviour between FRP and concrete, and all these studies are limited to relatively low strain rates with the highest strain rate reached being around 4.9 s -1 [19][20][21]. This low strain rate does not necessarily reflect the true dynamic behaviour of FRP-retrofitted structures under high strain rates generated by high-speed impact and blast load, under which the strain rate of structural response can reach approximately up to a few hundred per second [22].…”

Section: Introductionmentioning

confidence: 99%

Strain rate effect on interfacial bond behaviour between BFRP sheets and steel fibre reinforced concrete

Yuan

Chen

Pham

et al. 2019

Composites Part B: Engineering

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Experimental Study on Dynamic Behavior of CFRP-to-Concrete Interface

Cited by 28 publications

References 36 publications

Finite element modelling of RC slabs retrofitted with CFRP strips under blast loading

Finite element modelling of RC slabs retrofitted with CFRP strips under blast loading

Performances, challenges and opportunities in strengthening reinforced concrete structures by using FRPs – A state-of-the-art review

Strain rate effect on interfacial bond behaviour between BFRP sheets and steel fibre reinforced concrete

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