Evaluating and Proposing Models of Predicting IC Debonding Failure

Said, Hemdan; Wu, Zhishen

doi:10.1061/(asce)1090-0268(2008)12:3(284)

Cited by 92 publications

(67 citation statements)

References 17 publications

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“…Algunos modelos, (14) y (19), se basan en la definición de unas condiciones para los esfuerzos actuantes más intuitivas desde el punto de vista de proyecto. En este artículo, se presenta un método de dimensionamiento del refuerzo basado en la definición de un diagrama de interacción cortante-momento flector asociado a su desprendimiento prematuro.…”

Section: Design Methods For Flexural Strengthening With Fiber Reinforcunclassified

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Dimensionamiento del refuerzo a flexión con laminados de polímeros reforzados con fibras (FRP) evitando su desprendimiento prematuro

Oller¹,

Bernat²,

Bellido³

2013

Inf. constr.

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RESUMENLa investigación experimental de elementos de hormigón reforzados a flexión mediante la adhesión de laminados de polí-meros reforzados con fibras (FRP) muestra que en la mayor parte de ensayos, el laminado se desprende de forma prematura iniciándose normalmente el fallo en las regiones más solicitadas debido al efecto de las fisuras intermedias. Desde los inicios de esta técnica de refuerzo, se han desarrollado modelos para evitar este tipo de rotura, la mayoría de los cuales presentan una dispersión considerable comparando sus resultados con los experimentales. En este artículo se presenta un análisis comparativo de diferentes formulaciones existentes a partir de una base de datos de ensayos recopilada por los autores. Posteriormente, se propone un método de dimensionamiento basado en un diagrama de interacción cortante-flexión asociado al desprendimiento del refuerzo, que depende de la máxima fuerza rasante transmitida entre fisuras adyacentes. Finalmente, se compara este método con el resto de modelos analizados, obteniéndose resultados muy satisfactorios en relación a la predicción de la carga última. 605-3 SUMMARY

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Section: Design Methods For Flexural Strengthening With Fiber Reinforcunclassified

“…Said y Wu (19) proponen un límite de la deformación del laminado a partir del cual, y suponiendo que el desprendimiento del laminado suele ocurrir una vez ha plastificado la armadura, deducen un momento último resistente asociado al fallo prematuro debido a las fisuras intermedias.…”

Section: Said Y Wu (19)unclassified

Dimensionamiento del refuerzo a flexión con laminados de polímeros reforzados con fibras (FRP) evitando su desprendimiento prematuro

Oller¹,

Bernat²,

Bellido³

2013

Inf. constr.

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“…(6)(7)(8)(9)(10) show the relationships of load-tensile strain in the CFRP laminates of series A2, B2, B1e, B2e and B2i respectively. The tensile strains in CFRP laminates of the strengthened beams at initial debonding  fd,tested are listed in Table 3 and Table 4, and illustrated in Fig.…”

Section: Test Resultsmentioning

confidence: 99%

“…In light of the maximum FRP tensile strain corresponding to the ultimate experimental load of each tested beam in the database and considering the effect of concrete compressive strength, Said and Wu [9] proposed a critical value for FRP tensile strain on the debonding failure.…”

Section: Fig (12)mentioning

confidence: 99%

“…This failure mode of debonding is properly termed as intermediate crack-induced debonding. The prevalent Code provisions [1][2][3][4][5][6] and proposed models [7][8][9][10] for the design of externally bonded FRP systems often take the method by limiting the tensile strain or stress in the FRP laminates to mitigate debonding. Based on the tests results of flexurally FRP-strengthened RC beams failed cause of intermediate crack-induced debonding failure, this paper carried out a comprehensive comparison of the Code provisions and models and evaluated their validity and accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Debonding-Related Strain Limits for Externally Bonded FRP Sheets in Flexurally Strengthened Reinforced Concrete Beams

Li¹,

Zhang²,

Guo³

2013

TOCIEJ

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Debonding problems of externally bonded fiber reinforced polymer (FRP) sheets in flexurally FRP-strengthened reinforced concrete (RC) beams have been a concern and a research challenge since their application of this strengthening technique. Intermediate crack induced debonding is the most common failure mode which is that the debonding initiates at the critical flexural-shear or flexural cracks and propagates towards the direction of moment decrease. To mitigate debonding failure, most Codes and proposed models take the method by limiting the allowable tensile strain in FRP laminates. This paper presents experimental tests of concrete beams flexurally strengthened with externally bonded CFRP sheets to investigate debonding initiation and tensile strain of FRP laminates. The allowable tensile strain of FRP sheets in flexurally FRP-strengthened RC beams proposed by prevalent Code provisions and models was assessed based on the data obtained from experimental programs. It has beenshown that the allowable tensile strains provided by these provisions and models have a great difference with that of experimental results and exhibit a high level of dispersion. Furthermore, the FRP laminates of most tested RC beams were debonded before reaching the proposed allowable tensile strain. The Code provisions and models are inadequate to effectively prevent intermediate crack induced debonding failure in flexurally FRP-strengthened RC members. This is known to be a critical issue in engineering design and application of RC beams flexurally strengthened by FRP sheets.

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Externally Bonded Reinforced Concrete Structures

Ludovico

Ceroni

Lignola

et al. 2012

Wiley Encyclopedia of Composites

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Fiber-reinforced polymer (FRP) materials have been emerged as very effective and reliable materials for the repair, strengthening, and retrofitting of existing reinforced concrete (RC) structures. After a brief introduction on the variety of FRP materials and strengthening techniques for applications on civil structures, the basic principles for designing different strengthening configurations with these materials are herein presented and discussed. First, the bond mechanism, at the base of the structural performance of each type of external strengthening with FRP materials, is discussed both for externally bonded reinforcements (EBR) usually applied in the shape of sheets and plates and for near surface-mounted (NSM) reinforcements usually applied in the shape of bars or strips. Then, flexural, shear, and confinement applications are examined in detail and the basic mechanical principles of performing safety verifications are illustrated with reference to both provisions from current international design guidelines and innovative theories from up to date scientific literature. Finally, an overview on the potentialities of FRP materials for seismic strengthening is presented

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Evaluating and Proposing Models of Predicting IC Debonding Failure

Cited by 92 publications

References 17 publications

Dimensionamiento del refuerzo a flexión con laminados de polímeros reforzados con fibras (FRP) evitando su desprendimiento prematuro

Dimensionamiento del refuerzo a flexión con laminados de polímeros reforzados con fibras (FRP) evitando su desprendimiento prematuro

Debonding-Related Strain Limits for Externally Bonded FRP Sheets in Flexurally Strengthened Reinforced Concrete Beams

Externally Bonded Reinforced Concrete Structures

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Evaluating and Proposing Models of Predicting IC Debonding Failure

Cited by 92 publications

References 17 publications

Dimensionamiento del refuerzo a flexi&#243;n con laminados de pol&#237;meros reforzados con fibras (FRP) evitando su desprendimiento prematuro

Dimensionamiento del refuerzo a flexi&#243;n con laminados de pol&#237;meros reforzados con fibras (FRP) evitando su desprendimiento prematuro

Debonding-Related Strain Limits for Externally Bonded FRP Sheets in Flexurally Strengthened Reinforced Concrete Beams

Externally Bonded Reinforced Concrete Structures

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Product

Resources

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Dimensionamiento del refuerzo a flexión con laminados de polímeros reforzados con fibras (FRP) evitando su desprendimiento prematuro

Dimensionamiento del refuerzo a flexión con laminados de polímeros reforzados con fibras (FRP) evitando su desprendimiento prematuro