Structural behaviour of RC beams externally strengthened with FRP sheets under fatigue and monotonic loading

Jian, Dong; Wang, Hongtao; Guan, Zhong

doi:10.1016/j.engstruct.2012.03.024

Cited by 76 publications

(45 citation statements)

References 42 publications

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“…[8][9][10][11][12][13], additional research has provided further insight into their deflection behaviour. For instance, several approaches available in the literature can predict accurately deflections of members subjected to flexure but only up to a service condition (e.g.…”

Section: Introductionmentioning

confidence: 99%

A practical method for determining shear crack induced deformation in FRP RC beams

Imjai

Guadagnini

Garcia

et al. 2016

Engineering Structures

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This article proposes a practical semi-empirical method for determining shear crack-induced deformations in Glass Fibre Reinforced Polymer (GFRP) Reinforced Concrete (RC) beams. Current design guidelines neglect shear and shear crack-induced deformations in the calculation of deflections of GFRP RC beams. However, shear-induced deformations can be up to 30% of the total beam deflection due to the lower stiffness of GFRP bars compared to steel. To calculate the component of deflection due to shear action and crack opening, the proposed model uses a 'single fictitious inclined crack' with a width equal to the sum of the individual effective shear crack widths. Twelve shear tests were conducted on six RC beams reinforced internally with GFRP bars considering different reinforcement types and test parameters. The additional deformation due to shear cracks calculated by the proposed model is then used to predict the overall deformations of such beams up to failure. It is shown that, in comparison to current design guidelines, the proposed model predicts more accurately the total deflection of FRP RC beams at both service and ultimate loads. This article contributes towards the development of more accurate models to assess the overall shear deflection behaviour of FRP RC beams so as to balance the performance, serviceability and economic viability of structures.

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Section: Introductionmentioning

confidence: 99%

A practical method for determining shear crack induced deformation in FRP RC beams

Imjai

Guadagnini

Garcia

et al. 2016

Engineering Structures

View full text Add to dashboard Cite

show abstract

“…However, although the morphological characteristics of FRP have close correlation with its mechanical properties, they have not been deeply studied using scanning electron microscopy (SEM) technique. Nowadays, in order to understand failure sequences of FRP composites and epoxy adhesives it has been correlated to the mechanical behavior of composites materials when they are used in retrofitting any concrete or steel element [1][2][3][4][5][6][7] . In addition, majority of researches that have focused on FRP composites and epoxy adhesive mechanical behavior did not explore the morphology of materials.…”

Section: Introductionmentioning

confidence: 99%

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

2017

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Morphological characteristics analysis before and after tensile tests were studied using scanning electron microscopy (SEM) technique to follow the failure evolution on carbon fiber reinforced polymer (CFRP) and epoxy resins. Micrograph analysis of CFRP plate before tensile test shows some intrinsic manufacturing defects, which can influence the mechanical properties of the material. Micrograph analysis after tensile test shows that cracks propagation start in manufacturing defects, which lead the carbon fiber to be pulled out instead of breaking. Thus, cracks propagate through interfacial zones affecting the sharing force between matrix and carbon fiber. For the epoxies materials, the microscopy analysis showed that although epoxies adhesive have different phase distribution before tensile test, failure surfaces are described by fine granular particles covalent bonded with matrix, and the material fails in a brittle manner when the strength outstripped these bonds. Failure process for each material correlating the mechanical properties with the morphological characteristics of materials was discussed.

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“…De acordo com a literatura, esta dispersão pode ser explicada porque o concreto é um material heterogêneo, sendo assim a tensão de ruptura varia de um corpo de prova para o outro e, como não é possível ensaiar o mesmo corpo de prova que foi rompido, para determinar a resistência à flexão simples sob carga centrada, a relação entre tensões varia ainda mais de uma amostra para a outra. Talvez, devido a este problema, alguns autores optam por aplicar tensões mais baixas, com ciclos pré-estabelecidos, e apresentam medidas de deformação sem ruptura dos corpos de prova [16,19,23].…”

Section: Figura 8: Resultados Do Ensaio De Fadigaunclassified

Estudo do comportamento mecânico do concreto com borracha de pneu

et al. 2016

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RESUMOEste estudo trata da análise das propriedades mecânicas do concreto, elaborado a partir da substituição de parte do agregado miúdo por borracha de pneu triturado. Foram realizados testes experimentais em corpos de prova submetidos à compressão axial, flexão simples sob carga centrada e fadiga. As medições foram feitas em três traços de concreto: 1) concreto sem borracha (denominado na presente pesquisa por concreto de referência); 2) concreto com borracha e consumo de cimento igual ao de referência; e 3) concreto com borracha e acréscimo de cimento até a obtenção da resistência do concreto de referência. Os resultados obtidos mostram que a adição de borracha provoca redução na resistência mecânica do concreto, o que pode reduzir as aplicações deste novo material. A presença da borracha também conferiu um menor módulo de elasticidade ao concreto, o que pode ser desejável em situações envolvendo ações de impacto, forças dinâmicas e fadiga. Além dessa vantagem, a aplicação da borracha de pneu no concreto contribui na reciclagem de um material poluente e que normalmente é descartado no meio ambiente. Palavras-chave: concreto; borracha de pneu; propriedades mecânicas. ABSTRACTThis study discusses the mechanical properties of concrete, elaborated from the partial replacement of fine aggregate by crushed rubber. It was made experimental tests in specimens submitted to axial compression, Young's modulus (stiffness), three-point bending flexural and fatigue. The measurements were performed on three mixtures: 1) concrete without rubber (denominated as reference concrete), 2) concrete with rubber and the consumption of cement equal of reference and 3) concrete with rubber and the addition of cement on the mixture until it obtains the same strength of the reference concrete. The results have indicated that adding rubber in concrete decreases the strength, which could reduce the application of this new material. The rubber also decreased the elastic modulus; this could improve the behavior of materials in situations involving impact actions, dynamics loads and fatigue. Furthermore, this new composite contributes on rubber tire recycling processes.

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Structural behaviour of RC beams externally strengthened with FRP sheets under fatigue and monotonic loading

Cited by 76 publications

References 42 publications

A practical method for determining shear crack induced deformation in FRP RC beams

A practical method for determining shear crack induced deformation in FRP RC beams

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

Estudo do comportamento mecânico do concreto com borracha de pneu

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