Experimental Analysis of Interface Between CFRP and Concrete Using Cylindrical Specimens

Santos, Antônio Carlos; Bittencourt, Túlio Nogueira; Gettu, Ravindra

doi:10.1142/9789812704863_0014

Cited by 6 publications

(11 citation statements)

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“…4 can represent f(s) in Eq. 1 and fit with the experimental results quite well (Santos et al 2003, Dai et al 2005. Figure 2 shows one example.…”

Section: Frp-concrete Interfaces With Long Bond Length (Dai Et Al 2005)supporting

confidence: 59%

“…Due to the important roles of interface bond in maintaining the composite performances of retrofitted members, the interface properties of FRP externally bonded to concrete should be studied extensively from both mechanical and durability viewpoints (Buyukozturk et al 2004). Many researchers have applied direct pullout tests to evaluate overall and local bond characteristics of FRP-concrete joints subjected to shear (Chajes et al 1996, Täljsten 1997, Neubauer and Rostásy 1997, Maeda et al 1997, Bizindavyi and Neale 1999, Brosens and Van Gemert 1999, Miller et al 1999, Sato et al 2000, Yoshizawa et al 2000, Lorenzis et al 2001, Nakaba et al 2001, Kanakubo 2003, Santos 2003, Dai and Ueda 2003, Yao et al 2004, Xiao et al 2004). This broad array of studies gave birth to various bond strength, anchorage length and local bond stress-slip models (see the review in Teng 2001, Teng et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Unified Analytical Approaches for Determining Shear Bond Characteristics of FRP-Concrete Interfaces through Pullout Tests

Dai¹,

Ueda²,

Sato³

2006

ACT

147

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The pullout test is a conventional test method for calibrating interfacial shear bond characteristics of Fiber Reinforced Polymer (FRP)-concrete interfaces. However, due to the small bending stiffness of FRP sheets/strips and the highly non-linear interface fracturing mechanism, a well-recognized analytical approach to the accurate interpretation of the pullout test results remains to be achieved despite extensive studies particularly when the aim is to calibrate a local bond stress-slip model, which is necessary for developing bond strength and anchorage length models avoiding the use of empirical formulations. This paper introduces a newly developed non-linear bond stress-slip model for analyzing full-range strain distributions in FRP and shear bond stress distributions in the interface bond layer during pullout tests, along with a new anchorage length model and bond strength model that were developed accordingly. Compared with other existing bond models, the bond model described here has two advantages besides its simplicity: (1) it incorporates the most important interface parameter, the so-called interfacial fracture energy, in all analytical processes and links it successfully with all other important bond parameters; (2) it is a general and unified approach that allows for the first time consideration of the effects of the adhesive bond layer in non-linear analysis of FRP-concrete interfaces. Further, a unified bond stress versus slip expression is formulated to show the differences in local bond stress-slip relationships at the loaded and free ends in pullout tests, so that the effects of the bond length used in a pullout test on the calibration of the interfacial bond stress-slip model can be clarified. The reliability of all proposed models is verified through a comprehensive comparison of the experimental and analytical results.

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“…4 can represent f(s) in Eq. 1 and fit with the experimental results quite well (Santos et al 2003, Dai et al 2005. Figure 2 shows one example.…”

Section: Frp-concrete Interfaces With Long Bond Length (Dai Et Al 2005)supporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Unified Analytical Approaches for Determining Shear Bond Characteristics of FRP-Concrete Interfaces through Pullout Tests

Dai¹,

Ueda²,

Sato³

2006

ACT

147

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show abstract

“…Second, the FRP sheets have rather small bending stiffnesses, so that the strains observed on the surface of FRP sheets have a larger scatter due to local deformations. Third, the interface between FRP composites and concrete easily exceeds the peak shear bond stress, even if there is a low tensile stress level in FRP sheets, so that the interfacial τ–s relationship is highly nonlinear48.…”

Section: Bond Modeling and Fundamental Applications In Retrofittingmentioning

confidence: 99%

Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

Ueda¹,

Dai²

2004

Progress Structural Eng Maths

116

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SUMMARYThe success of most of strengthening or retrofitting technologies for concrete structures by using external bonded FRP sheets highly depends on the interface bond between FRP sheets and concrete substrates. This paper reviews current studies on evaluating the bond properties of FRP sheet-concrete interfaces, and in particular, focuses on several newly developed bond models for describing the bond characteristics of FRP sheet-concrete interfaces under various loading conditions. This paper also gives several examples that apply those interfacial bond models to the design of different retrofitting cases. Analytical solutions are discussed that consider the local interfacial delamination and slip behaviour, which can improve the prediction of strength and deformation performances, as well as clarify the failure mechanisms of concrete members upgraded with FRP composites. Moreover, the improvement in structural performances of retrofitted concrete members is discussed by relating them to the optimum microscopic properties of the interface bond and the properties of retrofitting materials.

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“…Santos et al [25] proposed a direct tensile test on concrete cylinder specimens (150 mm × 300 mm) for analysis of the bond strength of FRP-to-concrete joints (see Section: Methodology). They tested and corroborated this methodology.…”

Section: Introductionmentioning

confidence: 99%

“…The authors demonstrated the reproducibility of the test. The main advantages of this test are the inexistence of large eccentricities, good reproducibility, the use of cylindrical specimens (a very common geometry in civil engineering), and one test allows obtaining three simultaneous interface tests [25]. Its main disadvantage is that the concrete specimens have a circular surface, while structural elements in which the debonding occurs are usually non-circular.…”

Section: Introductionmentioning

confidence: 99%

Size effect on the methodology with cylinder specimens for FRP-to-concrete debonding analysis

Borges

Santos

2021

Rev. IBRACON Estrut. Mater.

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This is a study about the size effect on the methodology with concrete cylinder specimens for analysis of the debonding phenomenon at the interface between concrete and carbon fiber reinforced polymer (FRP). The influence of the concrete specimen size variation is analyzed by maintaining the same geometry in adhered FRP. Direct tensile experiments were performed with three dimensions of cylindrical concrete specimens (diameter × height) for analysis of size effect: 50 mm × 100 mm, 100 mm × 200 mm, and 150 mm × 300 mm. Ten different geometries of the composite material were tested. Two failure modes were observed in the experiments: debonding between the two materials and tensile failure in concrete specimens. In experiments with interface failure, the size of concrete specimens has no significant influence on maximum force, shear stress to peak, and stiffness in debonding between concrete and FRP. However, the use of smaller specimens for analysis of interface collapse is limited because the concrete reaches its normal stress capacity with a lower tensile force, and therefore, the failure often occurs in the concrete.

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Experimental Analysis of Interface Between CFRP and Concrete Using Cylindrical Specimens

Cited by 6 publications

References 0 publications

Unified Analytical Approaches for Determining Shear Bond Characteristics of FRP-Concrete Interfaces through Pullout Tests

Unified Analytical Approaches for Determining Shear Bond Characteristics of FRP-Concrete Interfaces through Pullout Tests

Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

Size effect on the methodology with cylinder specimens for FRP-to-concrete debonding analysis

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