Repair and strengthening of shear-deficient reinforced concrete beams using Carbon Fiber Reinforced Polymer

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“…O modelo mostrou uma maior precisão em comparação com os existentes na literatura. Karzad et al (2017Karzad et al ( , 2019 Foster et al (2016).…”

Section: Estudos Experimentais Usando Técnicas De Reforço Externa (Eb) E Nsm Ao Cisalhamento Com Prfunclassified

Estudo Do Uso De Materiais Alternativos Na Indústria Da Construção Civil Brasileira

Santos¹,

Oliveira²,

Lima³

et al. 2021

Coleção Desafios Das Engenharias: Engenharia Civil

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“…[3,4]. Other parameters that add to the already complex shear behavior of strengthened RC members include the possible interaction between steel shear reinforcement and FRP composite [5].…”

Section: Introductionmentioning

confidence: 99%

“…The shear strengthening of RC members with EB-FRP remains a current research problem and requires more investigations to be completely understood. Examples of recent research studies on this topic include Bousselham and Chaallal [6], Lu et al [7], Mofidi and Chaallal [8], Nguyen-Minh and Rovnak [9], and Karzad et al [5]. Except for Karzad et al [5], past experimental studies focused mainly on exploring the effectiveness of EB-FRP shear strengthening techniques and configurations.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of recent research studies on this topic include Bousselham and Chaallal [6], Lu et al [7], Mofidi and Chaallal [8], Nguyen-Minh and Rovnak [9], and Karzad et al [5]. Except for Karzad et al [5], past experimental studies focused mainly on exploring the effectiveness of EB-FRP shear strengthening techniques and configurations. Moreover, the previously proposed predictive models, when compared to test results are found to be less accurate [10], which indicates that other parameters that may influence the EB-FRP shear resistance have not yet been determined, and many interactions between the parameters have still not been fully discovered.…”

Section: Introductionmentioning

confidence: 99%

“…It was observed that increasing the steel shear reinforcement ratio decreases the gain in shear capacity due to the contribution of FRP and that both ACI PRC-440.2-17 [1] and HB 305-08 [13] failed to capture this phenomenon. In a recent study carried by Karzad et al [5], the interaction between conventional shear reinforcement and the EB-CFRP strips has been studied by testing 16 shear-strengthened and repaired rectangular RC beams with two different shear reinforcement ratios. The authors demonstrated that the contribution of CFRP in shear strength is affected by the quantity of steel stirrups and that when compared to test results, the ACI PRC-440.2-17 and European fib-TG9.3 formulas provided reasonable estimation of the additional shear strength contributed by the EB-CFRP discrete strips, except for the beams with moderate ratio of steel stirrups.…”

Section: Introductionmentioning

confidence: 99%

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Shear Strength of Externally U-Bonded Carbon Fiber-Reinforced Polymer High-Strength Reinforced Concrete

et al. 2021

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In this paper, we investigate the contribution of Fiber-Reinforced Polymer (FRP) to the load-carrying capacity of shear-strengthened Reinforced Concrete (RC) beams. Specifically, the investigation is focused on the FRP’s contribution in the presence and absence of shear stirrups. To this end, two sets of full-scale RC beam specimens were tested to failure in a simply supported setup. Set 1 consisted of specimens without shear stirrups whereas Set 2 included steel stirrups spaced at 170 mm. One and two layers of FRP discrete strips were bonded to the beams in a U-jacketing configuration. To investigate the contribution of FRP and its interaction with the stirrups, two different locations were considered when bonding the FRP strips: between the stirrups (referred to as Off-beams) and at the same level of the stirrups (referred to as On). Results of the experimental program showed that strengthening the beams with two layers of FRP does not necessarily translate to improved capacity. Furthermore, the location of FRP strips with respect to the location of shear stirrups has an influence on the beam’s overall behavior, especially its displacement ductility. This is an important parameter to consider to avoid premature failure of RC members. Test results were then used to assess the performance and accuracy of the predictions of ACI PRC-440.2-17 and fib-TG9.3. Both design codes were found to be conservative with an average prediction-to-test ratio of 0.7.

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Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

Abdo

Sharaky

Ahmed

2023

Structural Concrete

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The reinforced concrete (RC) beams could be upgraded in shear using steel and fiber‐reinforced polymer (FRP) having several shapes (bars, strips, or sheets). Using near‐surface mounted (NSM) Glass FRP (GFRP) bars is still limited compared to carbon FRP (CFRP) elements as shear reinforcement. Moreover, using reinforced high‐strength concrete layers (HSCL) as NSM shear strengthening for the RC beams is still limited. Herein, three RC beams internally reinforced in shear using different shear areas (without, 100 mm stirrups apart, and 200 mm stirrups apart) were experimentally tested as reference beams (CB). Other eight beams strengthened in shear using NSM HSCL, and bars were experimentally tested. Moreover, an extended finite element (FE) simulation was implemented through a verified FE model to study the effect of other NSM aspects on shear‐strengthened beam response. The results explained that, regardless of the internal stirrups area and external NSM characteristics, the shear‐strengthened beams showed higher load efficiency than the corresponding CB. The NSM upgraded shear beam had slightly higher load efficiency than the un‐strengthened beam having the same steel area as internally shear stirrups. Moreover, increasing the internal shear stirrups decreased the total efficiency of the NSM shear strengthening and the internal stirrups regardless of the NSM characteristics. Furthermore, the NSM HSCL was more efficient than the corresponding NSM bars in increasing the load capacity and stiffness of the shear‐strengthened beams. The reported analytical model predicted well the shear capacity of the tested beams.

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Repair and strengthening of shear-deficient reinforced concrete beams using Carbon Fiber Reinforced Polymer

Cited by 49 publications

References 17 publications

Estudo Do Uso De Materiais Alternativos Na Indústria Da Construção Civil Brasileira

Estudo Do Uso De Materiais Alternativos Na Indústria Da Construção Civil Brasileira

Shear Strength of Externally U-Bonded Carbon Fiber-Reinforced Polymer High-Strength Reinforced Concrete

Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

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