Bond–slip model for CFRP strips near-surface mounted to concrete

Zhang, Shishun; Teng, Jinguang; Yu, Tao

doi:10.1016/j.engstruct.2013.05.032

Cited by 76 publications

(40 citation statements)

References 22 publications

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“…The FRP is modelled as an elastic isotropic brittle material, and the steel reinforcement including tension bars, compression bars and stirrups is modelled as an elastic-perfectly plastic material. The interfacial behaviour between longitudinal steel bars and concrete is simulated using the bond-slip model given in CEB- FIP 29] while that between NSM FRP strips and concrete is simulated using the bond-slip model proposed by Zhang et al [31]. The latter means that the FE model is only applicable to RC beams strengthened in flexure with NSM CFRP strips although applicability to other forms of FRP reinforcement can be easily enabled by replacing Zhang et al's bond-slip model [31] with an appropriate model.…”

Section: Simplified Fe Approach For End Cover Separationmentioning

confidence: 99%

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Teng

Zhang

Chen

2016

Engineering Structures

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Abstract:As an alternative to externally bonded FRP reinforcement, near-surface mounted (NSM) FRP reinforcement can be used to effectively improve the flexural performance of RC beams. In such FRP-strengthened RC beams, end cover separation failure is one of the common failure modes. This failure mode involves the detachment of the NSM FRP reinforcement together with the concrete cover along the level of the steel tension reinforcement. This paper presents a new analytical strength model for end cover separation failure in RC beams strengthened in flexure with NSM FRP strips (i.e. rectangular FRP bars with a sectional height-to-thickness ratio not less than 5), which was formulated on the basis of extensive numerical results from a parametric study undertaken using an efficient finite element approach. The proposed strength model consists of an approximate analytical equation for the debonding strain of the FRP reinforcement at the critical cracked section and a conventional section analysis to relate this debonding strain to the moment acting on the same section (i.e. the debonding strain). Once the debonding strain is known, the load level at end cover separation of an FRP-strengthened RC beam can be easily determined for a given load distribution. Predictions from the proposed strength model are compared with those of two existing strength models of the same type and available test results, which shows that the proposed strength model is in close agreement with test results and is far more accurate than the existing strength models.

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Section: Simplified Fe Approach For End Cover Separationmentioning

confidence: 99%

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Teng

Zhang

Chen

2016

Engineering Structures

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“…The values of the parameters that define the different local bond-slip laws, as well as the properties of materials and characteristics of specimens have been chosen according to previous experimental campaigns found in the literature [13][14][15][16]25,26], with the aim to simulate conditions as realistically as possible.…”

Section: Parameters Usedmentioning

confidence: 99%

“…Focusing specifically on the characterization of the local bond behavior of NSM FRP-to-concrete joints, several bond-slip laws have been proposed in the literature, with different shapes and stages. Some examples are the models proposed by Sena et al [13], Borchert et al [14], Zhang et al [15], and Seracino et al [16]. The effect of their differences on the structural bond response and design implications is not always straightforward, thus, development of numerical tools that allow obtaining and comparing the response for different models is of main interest.The aim of this paper is to study the effect of the shape of the local bond-slip law on the global bond behavior of NSM FRP strengthening systems.…”

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confidence: 99%

Characterization and Simulation of the Bond Response of NSM FRP Reinforcement in Concrete

2020

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The near-surface mounted (NSM) technique with fiber reinforced polymer (FRP) reinforcement as strengthening system for concrete structures has been broadly studied during the last years. The efficiency of the NSM FRP-to-concrete joint highly depends on the bond between both materials, which is characterized by a local bond–slip law. This paper studies the effect of the shape of the local bond–slip law and its parameters on the global response of the NSM FRP joint in terms of load capacity, effective bond length, slip, shear stress, and strain distribution along the bonded length, which are essential parameters on the strengthening design. A numerical procedure based on the finite difference method to solve the governing equations of the FRP-to-concrete joint is developed. Pull-out single shear specimens are tested in order to experimentally validate the numerical results. Finally, a parametric study is performed. The effect of the bond–shear strength slip at the bond strength, maximum slip, and friction branch on the parameters previously described is presented and discussed.

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“…For NSM CFRP bars, NSM GFRP bars and NSM steel bars the bond stress-slip model by De Lorenzis [38] was used. For the CFRP strips, the bond stress-slip model by Zhang et al [39] was used. The stress-strain model by Popovics [40] was used to create the size-dependent stress-strain relationship for concrete.…”

Section: Materials Modelsmentioning

confidence: 99%

Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements

Shukri

Jumaat

2016

Construction and Building Materials

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Bond–slip model for CFRP strips near-surface mounted to concrete

Cited by 76 publications

References 22 publications

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Characterization and Simulation of the Bond Response of NSM FRP Reinforcement in Concrete

Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements

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