Interface debonding failure in beams strengthened with externally bonded GFRP

Oh, Hongseob; Sim, Jongsung

doi:10.1163/156855404322681037

Cited by 36 publications

(7 citation statements)

References 5 publications

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“…The main advantage of FRP spike anchors, as opposed to other anchorage systems, is their applicability to a wide range of structural applications and their compatibility with the FRP sheets [ 34 , 35 , 36 ]. A number of studies investigated the use of FRP spike anchors in flexural [ 37 , 38 , 39 ] and shear [ 40 , 41 , 42 , 43 , 44 ] applications and under direct pullout [ 45 , 46 , 47 ]. The focus has been on the effect of different anchor parameters and anchor alignment on the strength enhancement of the FRP system.…”

Section: Introductionmentioning

confidence: 99%

CFRP U-Wraps and Spike Anchors for Enhancing the Flexural Performance of CFRP-Plated RC Beams

et al. 2023

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Deterioration of infrastructure is a major challenge in the civil engineering industry. One of the methods that has been deemed effective in upgrading reinforced concrete (RC) structures is using externally bonded fiber-reinforced polymer (FRP) composites. However, the efficacy of this retrofitting technique is limited by the premature debonding failure of the FRP at the concrete-FRP interface; thus, the full capacity of the FRP is rarely utilized. Anchorage systems were proposed as a feasible solution to suppress or delay debonding failure. This paper presents an experimental investigation on the use of end U-wraps and carbon FRP (CFRP) spike anchors to anchor CFRP plates bonded to flexure-deficient RC beams. The experimental program consisted of seven RC beams with the length of the CFRP plate, type of anchorage, and the number of anchors as experimental variables. Test results indicated a remarkable enhancement in the ultimate load-carrying capacity when longer CFRP plates were used to strengthen the beams. In addition, anchoring the plates enhanced the strength of the CFRP-plated beams by 16–35% compared to the unanchored specimen, depending on the anchorage type and scheme. Finally, fib Bulletin 90 (2019) provisions provided the most accurate predictions of the moment capacity of the strengthened specimens.

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Section: Introductionmentioning

confidence: 99%

CFRP U-Wraps and Spike Anchors for Enhancing the Flexural Performance of CFRP-Plated RC Beams

et al. 2023

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“…The premature debonding is dependent on many factors. Oh and Sim 16 investigated the effects of length, thickness and width of FRP sheets on debonding, and concluded that the failure mode may be changed from CCS to interface debonding by increasing the FRP sheet length. A semi‐empirical equation was developed to predict debonding strength by limiting the GFRP stress at interface debonding.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is a critical issue to develop a reliable method to delay or prevent the critical mode of FRP debonding failure, improving the utilization of FRP. Previous research on the steel plate or FRP laminate strengthening have proved that the application of anchorage systems is a good choice 16,30 . Kalfat and Smith 31 made a comprehensive review of experimental studies conducted in the area of anchorage systems applied to FRP strengthened RC beams.…”

Section: Introductionmentioning

confidence: 99%

Analytical model for concrete cover separation of FRP strengthened RC beams with multiple steel bolts

Zhang

Shi

Zhu

et al. 2020

Structural Concrete

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In this paper, analytical models for concrete cover separation (CCS) of FRP strengthened reinforced concrete (RC) beams with multiple steel bolts were developed based on concrete tooth model for strengthened RC beams without anchors. The derivation of the models involved three major steps: (a) determination of the crack spacing (width of the concrete teeth); (b) determination of the pull‐out strength of steel bolt considering the effect of shear crack; and (c) determination of the peak load of FRP strengthened beams when CCS occurs based on the concrete tooth model. Validation test on five RC beams was conducted to investigate the effect of anchorage systems on the premature debonding of FRP strengthened RC beams. Results showed that steel bolts with enough embedding length can effectively suppress the initiation and propagation of CCS, thus improve the performance of FRP strengthened RC beams. Moreover, a database of FRP strengthened RC beams with mechanical fasteners (MFs) and failed in CCS or FRP fracture (FR) was assembled from the literature. The analytical predictions agreed well with the experimental results.

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“…Debonding results in the lost of the high-strength characteristics of FRP and the reduction of strengthened efficiency. The modes of debonding mainly include intermediate crack (IC) debonding and plate end debonding, and IC debonding usually occurs in the RC beams flexurally strengthened with FRP 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Energy Release Rate of Interface Crack in Rc Beams Strengthened with Fiber Reinforced Polymer under Four Point Bending

Xie

Huang

Guo

et al. 2014

Polymers and Polymer Composites

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A popular method for strengthening reinforced concrete (RC) beams is to bond fiber reinforced polymer (FRP) plates to the soffit. An important failure mode for such retrofitted members is debonding of the FRP plates from the member due to high interfacial stresses near the intermediate crack. Accurate prediction of the energy release rate of interface crack between FRP and concrete is a prerequisite for designing against debonding failure. In this paper, a theoretical analysis was conducted to investigate the energy release rate of interface crack embedded in the FRP-plated RC beam subjected to four point bending. A mechanical analysis model including the consideration of the major flexural crack and tension steel reinforcement was established for the interface crack tip of plated RC beam. The deflection of the FRP-plated RC beam and the axial force in the plates were analyzed on the basis of the classical beam theory. The compliance of plated RC beam was derived before the tension steel yielding, and a theoretical solution of the energy release rate was then proposed. Moreover, numerical results based on the proposed theoretical model were presented to illustrate the effects of various parameters on the energy release rate of interface crack in the plated RC beam.

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Interface debonding failure in beams strengthened with externally bonded GFRP

Cited by 36 publications

References 5 publications

CFRP U-Wraps and Spike Anchors for Enhancing the Flexural Performance of CFRP-Plated RC Beams

CFRP U-Wraps and Spike Anchors for Enhancing the Flexural Performance of CFRP-Plated RC Beams

Analytical model for concrete cover separation of FRP strengthened RC beams with multiple steel bolts

Energy Release Rate of Interface Crack in Rc Beams Strengthened with Fiber Reinforced Polymer under Four Point Bending

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