Numerical investigation for the fatigue performance of reinforced concrete beams strengthened with external prestressed HFRP sheet

Zhou, Chuwei; Ai, Jun; Petrů, Michal; Liu, Yao

doi:10.1016/j.conbuildmat.2019.117601

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…However, using prestressed laminates tended to increase damage to the CFRP/concrete interface, increasing thereby the possibility of debonding failure. Similar conclusions were made by Wang et al [58] upon FEA of RC beams strengthened in flexure with prestressed hybrid FRP (HFRP), consisting of hybrid carbon and glass FRP (C/GFRP), under fatigue loading. It was stated that applying too much prestressing could lead to a large reversed arch and premature fracture of C/GFRP composites.…”

Section: Numerical Parametric Studies On the Frp/concrete Bondsupporting

confidence: 80%

On Bond-slip of EB-FRP/Concrete Interface in Shear Under Fatigue Loading: Review and Synthesis of Experimental Studies and Models

Fathi¹,

El-Saikaly²,

Chaallal³

2022

J. Civ. Eng. Constr.

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Reinforced concrete (RC) structures subjected to cyclic fatigue loading are prone to progressive damage. Among the types of structural damage, those leading to shear deficiencies can result in sudden rupture of structures without warning. Hence, RC structures deficient in shear urgently need retrofitting. The use of externally bonded (EB) fiber-reinforced polymer (FRP) composites presents many advantages and is a very promising technology for shear strengthening of RC structures. This paper encompasses a wide range of research findings related to the interaction between concrete and FRP under fatigue loading. The behavior of the bond between FRP and concrete plays a major role in the failure mode of FRP shear-strengthened structures especially under fatigue. Therefore, it is of interest to characterize the FRP/concrete interaction using appropriate models with respect to the influencing parameters. The paper will first discuss existing design guidelines and considerations related to the fatigue behavior of RC structures. A thorough review of available literature on EB-FRP/concrete bond in shear under cyclic fatigue loading will then be presented, with a focus on proposed bond-slip models and finite element studies of the FRP/concrete interface under fatigue loading.

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Section: Numerical Parametric Studies On the Frp/concrete Bondsupporting

confidence: 80%

On Bond-slip of EB-FRP/Concrete Interface in Shear Under Fatigue Loading: Review and Synthesis of Experimental Studies and Models

Fathi¹,

El-Saikaly²,

Chaallal³

2022

J. Civ. Eng. Constr.

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“…It was shown that under fatigue loading, the steel bar is at relatively low stress levels and most of the fatigue deformation is within the elastic phase [15], and the influence of corrosion on the elastic modulus of the steel bar are relatively small and can be neglected [16]. Therefore, it is assumed that the fatigue elastic modulus of a corroded steel bar remains unchanged.…”

Section: Fatigue Constitutive Model Of Corroded Steel Barmentioning

confidence: 99%

“…In this direction, the relationship between the force and displacement of the spring element is nonlinear. The bond-relative slip relationship for the nonlinear spring element is shown in Equation (15), and for uncorroded steel bars, the relationship is determined according to the local bond stress-slip relationship between uncorroded steel bars and concrete proposed by Houdle and Mirga [24], as shown in Equation ( 16):…”

Section: Numerical Simulation Modelmentioning

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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“…There are problems such as high intensity, long cycle time, and difficulty in obtaining fast and accurate test results in a short period of conducting a large number of tests. With the continuous development of numerical simulation technology, more and more researchers have started to use numerical simulation methods to study the fatigue performance of RC beams [10][11][12]. Jin et al [13] simulated the bond-slip behavior of longitudinal reinforcement by establishing a three-dimensional mesoscale numerical model and investigated the mechanical properties of carbon fiber reinforced polymer (CFRP)-reinforced RC beams with impact damage.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Performance Prediction of RC Beams Based on Optimized Machine Learning Technology

et al. 2022

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The development of fatigue damage in reinforced concrete (RC) beams is affected by various factors such as repetitive loads and material properties, and there exists a complex nonlinear mapping relationship between their fatigue performance and each factor. To this end, a fatigue performance prediction model for RC beams was proposed based on the deep belief network (DBN) optimized by particle swarm optimization (PSO). The original database of fatigue loading tests was established by conducting fatigue loading tests on RC beams. The mid-span deflection, reinforcement strain, and concrete strain during fatigue loading of RC beams were predicted and evaluated. The fatigue performance prediction results of the RC beam based on the PSO-DBN model were compared with those of the single DBN model and the BP model. The models were evaluated using the R2 coefficient, mean absolute percentage error, mean absolute error, and root mean square error. The results showed that the fatigue performance prediction model of RC beams based on PSO-DBN is more accurate and efficient.

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Numerical investigation for the fatigue performance of reinforced concrete beams strengthened with external prestressed HFRP sheet

Cited by 13 publications

References 28 publications

On Bond-slip of EB-FRP/Concrete Interface in Shear Under Fatigue Loading: Review and Synthesis of Experimental Studies and Models

On Bond-slip of EB-FRP/Concrete Interface in Shear Under Fatigue Loading: Review and Synthesis of Experimental Studies and Models

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

Fatigue Performance Prediction of RC Beams Based on Optimized Machine Learning Technology

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