Analysis of interfacial bonding characteristics of CFRP-concrete under fatigue loading

Zhu, Juntao; Wang, Xinling; Kang, Xian-Dong; Li, Ké

doi:10.1016/j.conbuildmat.2016.06.071

Cited by 21 publications

(29 citation statements)

References 25 publications

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“…When fatigue failure occurs, strain at the free end changes only slightly from that before fatigue. e effective bonding length of the interface under fatigue load can be determined by the distribution curves of BFRP grid strain along the bonding length during the fatigue process [43]. e length of effective force transmission area can be used to characterize the effective bonding length of an interface l e .…”

Section: Evolution Of Interface Strain and Effective Bonding Lengthmentioning

confidence: 99%

Experimental Investigation of the Fatigue Behavior of Basalt Fiber Reinforced Polymer Grid‐Concrete Interface

Wen

Wan

Liu

et al. 2020

Advances in Materials Science and Engineering

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Fatigue behavior is an important factor for mechanical analysis of concrete members reinforced by basalt fiber reinforced polymer (BFRP) grid and polymer cement mortar (PCM) and plays a critical role in ensuring the safety of reinforced concrete bridges and other structures. In this study, on the basis of the static loading test results of concrete specimens reinforced by BFRP grid and PCM, a series of fatigue tests with different loading levels were conducted on interfaces between BFRP grid and concrete to investigate the fatigue behavior of BFRP grid-concrete interfaces. The test results indicate that with high loading level, the fatigue failure mode of interface is interfacial peeling failure while it transforms to the fatigue fracture of the BFRP grid under low loading level. The fatigue life (S-N) curves of BFRP grid-concrete interface are obtained and fitted in stages according to different failure modes, and the critical point of the two failure modes is pointed out. The relative slip evolution of interface during fatigue is further revealed in different stages with two failure modes, and the law of interface strain is studied with the increase of fatigue times. The relation of effective bonding length of interface and fatigue times is also described.

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Section: Evolution Of Interface Strain and Effective Bonding Lengthmentioning

confidence: 99%

Experimental Investigation of the Fatigue Behavior of Basalt Fiber Reinforced Polymer Grid‐Concrete Interface

Wen

Wan

Liu

et al. 2020

Advances in Materials Science and Engineering

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“…Nair, Cai, Kong, and Hou (2019) used a new FRP-wrapped balsa wood bridge deck to replace the damage deck of a bridge and carried out corresponding experiment to evaluate this composite system, expecting to providing evaluation guidelines for this specially configured FRP-wood deck system. In general, all these researches on the behavior of strengthened structures or members by CFRP further promote the application of CFRP in the field of maintenance and reinforcement in civil engineering (Aidoo, Harries, & Petrou, 2006;Zhu, Wang, Kang, & Li, 2016). However, there are still two problems of analyzing structures strengthened with CFRP to be resolved, as summarized below:…”

Section: Introductionmentioning

confidence: 99%

Stressing State Characteristics of Reinforcement Concrete Box-Girders Strengthened With Carbon Fiber Reinforced Plastic

Xiao

Shi

Liu

et al. 2019

Journal of Civil Engineering and Management

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This paper investigates structural performance of five reinforcement concrete (RC) box-girders under a combination loading of bending, shear and torsion, applying the structural stressing state theory. The measured strain data is modeled as generalized strain energy density (GSED) to characterize the structural stressing state mode. Then the Mann-Kendall (M-K) criterion is innovatively applied to detect the leap characteristics of RC box-girders' stressing state from the E'-T curves, deriving the new definition of structural failure load. Furthermore, the reinforcement effects of different Carbon Fiber Reinforced Plastic (CFRP) wrapping schemes on the behaviors of experimental RC box-girders are revealed through comparing strain modes of stirrup and longitudinal reinforcement. Finally, the method of numerical shape function is applied to reasonably expand the limited strain data for further exploring the strain distribution of cross section and analyzing the stressing state characteristics of the RC box-girders. The research results provide a new angle of view to conduct structural analysis and a reference to the improvement of reinforcement scheme.

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“…Compared with thorough research studies on the static bond properties of the CFRP–concrete interface, limited studies have been conducted on the interfacial bond behavior under fatigue loading. The available experimental and theoretical studies involved in bond fatigue performance are mainly focused on the issues of fatigue life prediction [ 18 , 19 , 20 ], fatigue crack propagation behavior [ 20 , 21 , 22 , 23 ], and fatigue bond–slip performance [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Existing research studies have revealed that fatigue loading would produce degradation in the bond properties of a CFRP–concrete interface, which should be noted in the fatigue design of externally bonded CFRP systems [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…The available experimental and theoretical studies involved in bond fatigue performance are mainly focused on the issues of fatigue life prediction [ 18 , 19 , 20 ], fatigue crack propagation behavior [ 20 , 21 , 22 , 23 ], and fatigue bond–slip performance [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Existing research studies have revealed that fatigue loading would produce degradation in the bond properties of a CFRP–concrete interface, which should be noted in the fatigue design of externally bonded CFRP systems [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Ko et al [ 27 ] conducted double-shear pull-out tests (taking sheet layers and loading hysteresis as test variables) to explore the bond stress–slip relationship between CFRP sheets and concrete under cyclic loading, and proposed a bond stress–slip model for the interface under cyclic loading, which considered seven empirical parameters; namely, the maximum bond shear stress and its corresponding slip, the characteristic constant of bond–slip curve, the unloading stiffness, the ultimate slip, the friction stress, and the negative friction stress.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang [ 29 ] developed a bond stress–slip model (which was expressed as a function of the loading/unloading linear slip, the stiffness of the unloading branch in slip, and the number of fatigue load cycles) for CFRP plates that were externally bonded to concrete under fatigue loading based on double-lap pull-out test results. Zhu et al [ 30 ] carried out beam tests in order to investigate the fatigue behavior of the CFRP–concrete interface bond, considering the effects of loading amplitude and concrete strength, and developed a nonlinear bond–slip model for CFRP sheets that are bonded to concrete under fatigue loading based on test results.…”

Section: Introductionmentioning

confidence: 99%

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Bond–Slip Relationship for CFRP Sheets Externally Bonded to Concrete under Cyclic Loading

Cao

Yang

et al. 2018

Materials

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The objective of this paper was to explore the bond–slip relationship between carbon fiber-reinforced polymer (CFRP) sheets and concrete under cyclic loading through experimental and analytical approaches. Modified beam tests were performed in order to gain insight into the bond–slip relationship under static and cyclic loading. The test variables are the CFRP-to-concrete width ratio, and the bond length of the CFRP sheets. An analysis of the test results in this paper and existing test results indicated that the slope of the ascending segment of the bond–slip curve decreased with an increase in the number of load cycles, but the slip corresponding to the maximum shear stress was almost invariable as the number of load cycles increased. In addition, the rate of reduction in the slope of the ascending range of the bond–slip curve during cyclic loading decreased as the concrete strength increased, and increased as the load level or CFRP-to-concrete width ratio enhanced. However, these were not affected by variations in bond length if the residual bond length was longer than the effective bond length. A bilinear bond–slip model for CFRP sheets that are externally bonded to concrete under cyclic loading, which considered the effects of the cyclic load level, concrete strength, and CFRP-to-concrete ratio, was developed based on the existing static bond–slip model. The accuracy of this proposed model was verified by a comparison between this proposed model and test results.

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Analysis of interfacial bonding characteristics of CFRP-concrete under fatigue loading

Cited by 21 publications

References 25 publications

Experimental Investigation of the Fatigue Behavior of Basalt Fiber Reinforced Polymer Grid‐Concrete Interface

Experimental Investigation of the Fatigue Behavior of Basalt Fiber Reinforced Polymer Grid‐Concrete Interface

Stressing State Characteristics of Reinforcement Concrete Box-Girders Strengthened With Carbon Fiber Reinforced Plastic

Bond–Slip Relationship for CFRP Sheets Externally Bonded to Concrete under Cyclic Loading

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