Effects of pre-existing damage and cyclic overloading on the flexural behaviour of RC beams strengthened with prestressed CFRP plates

Xie, Jianhe; Li, Jianglin; Lu, Zhongyu; Liu, Di; Huang, Peiyan

doi:10.1016/j.engstruct.2021.113078

Cited by 15 publications

(5 citation statements)

References 57 publications

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“…As a result, the deterioration seriously compromises human safety in addition to compromising the structure's ability to be used [14,15,16]. Since it is essential to improve both the durability and security of these structures, retrofitting damaged or strengthening weak reinforced concrete structures with shear weaknesses has grown to be a significant problem in the construction industry [17,18,19]. Ayatar,2018[20] suggested utilizing precast panels manufactured with ECC materials rather than conventional concrete materials as an infill technique for crucial frame constructions.…”

Section: Introductionmentioning

confidence: 99%

Simulation of shear strengthening fire-exposure high strength lightweight reinforced concrete beams using basalt fiber-reinforced polymer grid and engineered cementitious composites jacket

Shareef,

Kadhum

2024

Preprint

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This research investigated a new composite strengthening technique consisting of a basalt fibre-reinforced polymer (BFRP) grid in compensation with engineered cementitious composites (ECC) matrix and their efficiency in promoting the capacities of deteriorated lightweight high strength concrete beams under fire. The experimental test was conducted utilizing a total of eight high strength lightweight concrete beams, including a control beam (non-exposed fire) that were instrumented, fire-exposed beams according to ISO 834 heating curve for one hour and strengthened beams specimens with BFRP grid and ECC jacket were prepared and tested for 30mm and 20 mm layer thickness, respectively. However, this work depends on various parameters, such as the LWC beams covers, thickness of jacketing, and constant fire duration for an hour. Additionally, finite element studies using ABAQUS/Standard software were used to develop analytical estimations for verifying the tested beams. This was done to ensure that the model proceeded as expected by comparing the experimental results with an absolute percentage error of less than 15% .Further, crack failure mode, stress distribution, shear capacity, and time-temperature distribution from the finite element models correspond well with the obtained data of the experimental beams in this investigation. Therefore, the simulation results demonstrated that ultimate load mid-span deflection curves, which represent the overall behavior of the finite element models, correspond well with the test data.

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Section: Introductionmentioning

confidence: 99%

Simulation of shear strengthening fire-exposure high strength lightweight reinforced concrete beams using basalt fiber-reinforced polymer grid and engineered cementitious composites jacket

Shareef,

Kadhum

2024

Preprint

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“…Song et al [9] proposed a fatigue evaluation model for prestressed CFRP-strengthened corroded RC beams, which was used to evaluate the damage mode, fatigue life, fatigue strength and post-fatigue ultimate load capacity of prestressed CFRPstrengthened corroded RC beams, and showed that the reinforcement design factors for corroded RC beams under cyclic fatigue loading are in the order of stiffness, fatigue life, fatigue strength and ultimate load capacity. Xie et al [10] studied the flexural behavior of prestressed CFRP-strengthened corroded RC beams through experiments, and the experimental results showed that the coupling effect of corrosion and cyclic loading significantly reduced the flexural stiffness of the strengthened beams but had little effect on the ultimate load of the strengthened beams, indicating the effectiveness of the prestressed reinforcement system.…”

Section: Introductionmentioning

confidence: 99%

Deformation Performance of CFRP-Strengthened Corroded Reinforced Concrete Beams after Fatigue Loading

Zhang

2023

Applied Sciences

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To study the deformation performance of CFRP-strengthened corroded RC (reinforced concrete) beams under fatigue loading, a numerical analysis method based on the fatigue damage failure process was used, and the fatigue constitutive models of each material were used as the basis. The finite element software ABAQUS was used to model and analyze the CFRP-strengthened corroded RC beams, and the degradation of bond performance between rusted reinforcement and concrete was considered in the simulation. Then, the flexural stiffness calculation method of CFRP-strengthened corroded RC beams was analyzed. Based on the validation of the finite element model, a regression analysis was performed on the mid-span deflection data of the simulated beam to establish a formula for calculating the mid-span deflection of CFRP-strengthened corroded RC beams under fatigue loading. Finally, the collected experimental data were compared with the calculation results using the mid-span deflection formula, which was validated to confirm its accuracy and reliability. The research results show that the mean, standard deviation and coefficient of variation of the ratio of experimental to calculated values were 0.95, 0.09 and 0.10, respectively, indicating that the calculated values of the proposed mid-span deflection formulation are in good agreement with the experimental values, which proves the correctness and high accuracy of the proposed formula for calculating the mid-span deflection. The formula can provide a theoretical basis for the evaluation of the deformation performance of CFRP-strengthened corroded RC beams under fatigue loading.

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“…A total of 81% tensile strength of the prestressed CFRP plate could be utilized, although the debonding of CFRP plate was not completely avoided. Xie et al [ 33 ] conducted an experimental study on the reliability of prestressed CFRP plates in anchor systems, assessing the effects of existing damage in reinforced concrete beams before strengthening and overloading after strengthening. Results indicated that the coupling action of corrosion- and cyclic overload-induced damage remarkably reduced the flexural stiffness but did not greatly impact upon the ultimate load of the strengthened beams.…”

Section: Introductionmentioning

confidence: 99%

Case Study on Prestressed CFRP Plates Applied for Strengthening Hollow-Section Beam Removed from an Old Bridge

Liu

Bao

et al. 2023

Polymers

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With the wide application of carbon fiber reinforced polymer (CFRP) plate, used for strengthening existed concrete structures, the prestressing technology of CFRP plate is becoming a hot topic, in order to sufficiently develop its high-strength peculiarity. In this paper, a full-scale hollow-section beam with length of 16 m taken from an old bridge which was in service for about 20 years was first examined for existed cracks and repaired by filling epoxy adhesive, and then the beam was strengthened with prestressed CFRP plates. The CFRP plates were tensioned and fixed with flat-plate anchorages at ends and bonded with adhesive on the bottom surface of the beam. The strengthened beam was experimentally studied using a four-point test to measure the concrete strain along the height of the mid-span section and the mid-span deflection. The finite element model of the strengthened beam was verified by the comparison of test results and used for an extending study of parametric analysis considering the effect of the length and amount of CFRP plates. Results indicated that with an increase in the length and amount of CFRP plates, the mid-span deflection of the beam decreases with the increased cracking resistance and bearing capacity, while the ultimate failure mode transfers from the under-reinforcement to the over-reinforcement.

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Effects of pre-existing damage and cyclic overloading on the flexural behaviour of RC beams strengthened with prestressed CFRP plates

Cited by 15 publications

References 57 publications

Simulation of shear strengthening fire-exposure high strength lightweight reinforced concrete beams using basalt fiber-reinforced polymer grid and engineered cementitious composites jacket

Simulation of shear strengthening fire-exposure high strength lightweight reinforced concrete beams using basalt fiber-reinforced polymer grid and engineered cementitious composites jacket

Deformation Performance of CFRP-Strengthened Corroded Reinforced Concrete Beams after Fatigue Loading

Case Study on Prestressed CFRP Plates Applied for Strengthening Hollow-Section Beam Removed from an Old Bridge

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