Experimental study on fatigue performance of RC beams strengthened with CFRP under variable amplitude overload and hot-wet environment

Chen, Zhanbiao; Huang, Peiyan; Yao, Guowen; Guo, Xinyan; Yang, Yi; Wen, Liu; Wu, Bo

doi:10.1016/j.compstruct.2020.112308

Cited by 19 publications

(10 citation statements)

References 30 publications

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“…Three types of fatigue loading procedures, 44 including constant, alternating and incremental amplitude fatigue loading, are shown in Figure 4. Since the frequency below 15 Hz was indicated to have little effect on the fatigue life of concrete structures, 38 all fatigue loading frequencies were set as 10 Hz in uniform considering acceptable experiment cost. Fatigue loading was controlled by force, and specimens were loaded to P 1min at a rate of 0.1 kN/s after preloading whose value was P 0 = 1 kN.…”

Section: Experimental Programmentioning

confidence: 99%

“…36,37 Furthermore, from the tests on RC beams under coupling action of hot-wet environment and variable amplitude overload, it is concluded that a relatively high load level exacerbates the crack propagation of tensile rebars, which results in earlier fracture of rebars and further failure of strengthened beams. 38 From the above literature review, the loading mode is critical to fatigue behavior of concrete beams strengthened with FRP, especially to the inferfacial properties of FRP sheets and concrete, but existing research has basically focused on the structural fatigue performance in one single loading mode, which lacks comparison between different loading modes. Therefore, in order to have a better understanding on this fatigue behavior of CFRP-concrete interface and to obtain quantitative description of fatigue performance, especially for the strengthened beams under the variable loading, bending fatigue tests on plain concrete beams strengthened with FRP were conducted by various loading modes in this study.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, studies on damaged concrete beams and strengthened beams have shown that the fatigue life degrades dramatically on an increase of loading amplitude 36,37 . Furthermore, from the tests on RC beams under coupling action of hot‐wet environment and variable amplitude overload, it is concluded that a relatively high load level exacerbates the crack propagation of tensile rebars, which results in earlier fracture of rebars and further failure of strengthened beams 38 …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interfacial properties of CFRP sheets and concrete subjected to variable amplitude fatigue loading

Yuan

Luo

Liu

et al. 2021

Structural Concrete

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In order to better understand the interfacial fatigue behavior of concrete and fiber-reinforced polymer (FRP), bending fatigue tests were conducted on plain concrete beams strengthened with carbon FRP (CFRP) sheets under variable amplitude cyclic loading which deteriorates structural performance in actual projects more dramatically than constant amplitude loading. The test parameters were four types of loading modes including static loading, constant amplitude cyclic loading, alternating amplitude cyclic loading and incremental amplitude cyclic loading. Miner damage rule, modified Miner damage rule and Corten-Dolan cumulative damage rule were used to predict the fatigue life of specimens. The relationship between loads and deflections, the relationship between strains and cycle times and the crack propagation were analyzed. The results have shown that the fatigue life of specimens under variable amplitude cyclic loading, especially alternating one, is shorter than that of specimens under constant one, and the modified Miner damage rule is more suitable to predict fatigue life. The crack lengths on the lateral faces of beams recorded by digital image correlation (DIC) method developed more slowly than those at the bottom sides recorded by strain gauges. A proposed damage model describing the relationship between the crack lengths and fatigue life for specimens under alternating amplitude fatigue loading is consistent with the experimental results well. K E Y W O R D Scarbon fiber reinforced polymer (CFRP), concrete reinforcement, crack length, interfacial properties, variable amplitude fatigue loading

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Section: Experimental Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interfacial properties of CFRP sheets and concrete subjected to variable amplitude fatigue loading

Yuan

Luo

Liu

et al. 2021

Structural Concrete

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“…La fibra de carbono no pierde eficacia en sus propiedades ante un ambiente húmedo y caliente, sin embargo, las propiedades de los adhesivos epoxídicos utilizados en los materiales PRF se degradan significativamente en un entorno húmedo y caliente. La resistencia de la unión de los adhesivos disminuye rápidamente cuando se acerca a temperaturas con transiciones vítreas [27] .…”

Section: Uso De Prfcunclassified

Uso de PRFC para mejorar las propiedades mecánicas del concreto: una revisión

Pérez

Chunga

Rafael

2021

CULCYT

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El polímero reforzado con fibra de carbono (PRFC) hoy en día se ha vuelto una alternativa de material de fortalecimiento para las estructuras en la construcción porque mejora las propiedades mecánicas del concreto y aunque es un proceso de fabricación de costo elevado, origina un gran beneficio para la estructura de concreto armado (CA). El objetivo de este trabajo ha sido revisar la investigación notable publicada en revistas indexadas de los años 2012 a 2021 (41 artículos de Scopus, 7 de EBSCO, 2 de Science Direct y 1 de Redalyc), sobre el uso del polímero reforzado con fibra de carbono en elementos estructurales, como reforzamiento interno o externo, que beneficia a la estructura en su periodo de vida, al impacto ambiental que este produce, al costo del material y al manejo del material in situ.

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“…Pedro et al [ 15 ] concluded that moisture diffuses into the interface via an adsorption process and accelerates the degradation of adhesive properties. Other researchers [ 16 , 17 , 18 ] have also unanimously concluded that humidity leads to a faster performance degradation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Humidity on Fatigue Performance of CFRP: A Molecular Simulation

Chen

et al. 2020

Polymers

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The study on durability of carbon fiber reinforced plastics (CFRP) in complex environments is critical because of its wide applications. Herein, mechanical behavior of carbon fiber reinforced epoxy composites in the fatigue process were investigated under different humidity via molecular dynamics (MD) simulation method. Transversely isotropic atom based models were established to simulate the structure of CFRP at the atomistic level. Owing to the weak performance in vertical fiber direction, mechanical behavior in a 90° orientation was investigated. Mean stress and energy were both employed to describe the evolution of mechanical performance while mean squared displacement (MSD), radius of gyration (Rg), and free volume were performed to describe the evolution of structural change during the fatigue process. The results show that the humidity led to a weakened interfacial adhesive performance. Free volume became larger under cyclic load, which caused the water molecules to diffuse into the inside of epoxy resin. The distance between the matrix and fiber became larger in the dry system while it reduced because of the diffusion of water molecules in wet system. The rate of performance degradation decreased with the increase in humidity because of poor initial performance at high humidity.

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Experimental study on fatigue performance of RC beams strengthened with CFRP under variable amplitude overload and hot-wet environment

Cited by 19 publications

References 30 publications

Interfacial properties of CFRP sheets and concrete subjected to variable amplitude fatigue loading

Interfacial properties of CFRP sheets and concrete subjected to variable amplitude fatigue loading

Uso de PRFC para mejorar las propiedades mecánicas del concreto: una revisión

Influence of Humidity on Fatigue Performance of CFRP: A Molecular Simulation

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