Using bore-epoxy anchorage to delay debonding of CFRP plates strengthened concrete beams

Mohamed, Khalid; Abdalla, Jamal A.; Hawileh, Rami A.; Nawaz, Waleed

doi:10.1109/icaset.2018.8376863

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…In tests, CFRP fabrics increased the ductility and energy dissipation capacity of beams. Although CFRP fabric and laminate increased the load-bearing capacity of beams, their combination decreased the ductility of beams as shown in the literature [21,22,30].…”

Section: Failure Modes Of Beamsmentioning

confidence: 74%

“…The results demonstrated the π-anchoring system's effectiveness, and showed that it is a feasible way for efficiently utilizing strong and thick laminates in strengthening members. Mohamed et al [21] developed a bore-epoxy anchorage system to delay the debonding problem. It was concluded that the bore-epoxy application delayed the debonding of CFRP plates and increased the shear capacity of beams.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation of RC beams strengthened with CFRP composites

2021

JCE

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This study aims to strengthen reinforced concrete (RC) beams having insufficient shear capacity using Carbon Fibre Reinforced Polymer (CFRP) members and innovative anchorages. An innovative method is also proposed for strengthening beams in interaction site of adjacent structures. Test results show that the behaviour of beams has been improved with CFRP elements. The nonlinear finite element (FE) method, as well as American and Italian guidelines, are used to estimate theoretical capacity of the beams. Test results are compared with theoretical results. It can be concluded that proposed methods can be used reliably, and that the design of RC beams strengthened with these methods can be performed by design engineers based on simple calculations.

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Section: Failure Modes Of Beamsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of RC beams strengthened with CFRP composites

2021

JCE

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“…1,2 These properties make CFRP preferred materials in a variety of industries, such as aerospace, naval, and automotive industries. 3 Due to their orthotropic nature, CFRPs are vulnerable to various complex and inconspicuous modes of failure, such as delamination, debonding, matrix cracking, and fiber breakage, during service life or manufacturing processes. 4 These failures may lead to loss of functionality of the composite structures.…”

Section: Introductionmentioning

confidence: 99%

A novel adaptive boosting algorithm with distance-based weighted least square support vector machine and filter factor for carbon fiber reinforced polymer multi-damage classification

Sheng

Liu

Söffker

2022

Structural Health Monitoring

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Adaptive boosting (AdaBoost) algorithms fuse multiple weak classifiers to generate a strong classifier by adaptively determining the fusion weights of the weak classifiers. According to incorrect or correct classification results, sample weights become larger or smaller. However, this weight update scheme neglects valuable information in the results. Moreover, an important requirement for weak classifiers is an accuracy higher than random guessing. This requirement is likely to lead to an unexpected result. This means that several generated weak classifiers with similar classification results cannot learn from each other. Consequently, the advantage of fusing multiple weak classifiers disappears. The classification and therefore distinction of different failure modes in materials is a typical task for classical nondestructive testing approaches as well as for new approaches based on machine learning methods. In the case different approaches can be applied, the main question is, which and how tuned approaches provide the best results in terms of accuracy or similar metrics. In the multi-damage classification task distinguishing different physical failure mechanisms in Carbon Fiber Reinforced Polymer (CFRP), the above two aspects complicate the application of AdaBoost algorithms. To improve the results, a novel AdaBoost with distance-based weighted least square support vector machine (WLSSVM) and filter factor is proposed. The distance-based WLSSVM is employed to increase the diversity of weak classifiers, the distances of the classification plane and samples are used to measure the classification task. The filter factor is proposed to filter out unnecessary classifiers contributing less to the final decision. The experimental results demonstrate that the improved AdaBoost schemes with distance-based WLSSVM and filter factor outperform state-of-the-art algorithms. The effects of the scheme using the new weighted update and the filter factor on the algorithm are discussed, respectively. The experimental results show that the combination of the two schemes perform better than other schemes.

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“…Their experimental test results showed that the beam strengthened by U-Wrapped CFRP sheets increased the shear strength of the tested beams significantly. Mohammed et al [ 36 ] carried an experimental investigation for on using bore-epoxy anchorage system to delay debonding of CFRP plates strengthened concrete beams. They concluded that the use of bore-epoxy delays the debonding of CFRP plates and therefore increased the shear capacity of the tested beams.…”

Section: Introductionmentioning

confidence: 99%

“…As shear strengthening, CFRP has been used extensively as an EBR without anchorage which resulted in premature debonding. Accordingly, many anchorage systems have been developed and used in order to solve the problem of debonding of CFRP sheets or plates by anchoring them to the stem of the beam [30][31][32][33][34][35][36][37][38][39]. Mohee et al [31] and Kalfat et al [32] presented a detailed review of use of anchors in general in externally bonded reinforcement using FRP.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates

2020

Self Cite

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Reinforced concrete (RC) beams strengthened in shear with carbon fiber reinforced polymer (CFRP) laminates as externally bonded reinforcement (EBR) usually fail due to debonding. This paper presents an experimental and analytical investigation on the use of groove-epoxy as an anchorage system for CFRP plates and sheets bonded on both sides of shear deficient RC beams. The aim of this study is to assess the effectiveness of using groove-epoxy in enhancing the shear capacity of RC beams. Nine rectangular RC beams were strengthened with CFRP plates and sheets with groove-epoxy anchorage systems of different groove widths and tested under four point bending. It is observed that the RC beams strengthened with the groove-epoxy anchorage system showed an increase in the shear-strength over the unstrengthened control beam up to 112 and 141% for plates and sheets, respectively. Also, the increase of shear-strength contribution of the groove-epoxy system to that of CFRP without grooves ranged between 30–190% for CFRP plates and between 40–100% for CFRP sheets. Generally, the contributions of groove-epoxy on shear-strength decreased with the increase of groove width. Moreover, shear strength prediction models, based on modifications of the ACI440.2R-17 shear model, were developed by incorporating groove factors as a modifier to the FRP shear-strength contribution. The developed models predicted the experimental shear-strength of the tested RC beams with a good level of accuracy, with an average mean absolute percent error (MAPE) = 3.31% and 6.68%, normalized mean square error (NMSE) = 0.072, 0.523, and coefficient of determination R2 = 0.964, 0.691, for plates and sheets, respectively.

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Using bore-epoxy anchorage to delay debonding of CFRP plates strengthened concrete beams

Cited by 7 publications

References 23 publications

Experimental and numerical investigation of RC beams strengthened with CFRP composites

Experimental and numerical investigation of RC beams strengthened with CFRP composites

A novel adaptive boosting algorithm with distance-based weighted least square support vector machine and filter factor for carbon fiber reinforced polymer multi-damage classification

Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates

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