Finite element modeling for fatigue life prediction of RC beam strengthened with prestressed CFRP based on failure modes

Guo, Xinyan; Wang, Yilin; Huang, Peiyan; Chen, Zhanbiao

doi:10.1016/j.compstruct.2019.111289

Cited by 18 publications

(8 citation statements)

References 21 publications

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“…The method is based on the theory of Miner's rule, called "Cumulative damage of reinforcement". The basic expression of the theory is shown as Equation ( 8) [22]. The theory was adopted by many other studies [23,24].…”

Section: Simulation Of the Welded Deteriorated Zone Of The Steel Barmentioning

confidence: 99%

“…In this study, the variation law of concrete strength resulting from fatigue can be calculated using the model of Zhu (2012) [21], which is suitable for concrete bearing a fatigue load for a long time. The model of the variation law for the compressive behavior of concrete can be determined by Equations ( 19)- (22). The variation law of elastic modulus can be expressed in Equation (22) [28].…”

Section: Strength Of Concretementioning

confidence: 99%

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Research on the Flexural Behavior of a Coastwise RS-OCT Beam That Has Endured Long-Term Fatigue Load for Years

Hou,

Hu,

Zhang

et al. 2023

JMSE

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Retrofitted super-span old T-shaped concrete beams (RS-OCT beams) are commonly used in highway bridges in coastal cities and offshore zones in China. The realization of a practical ultimate state for this beam under a bending load is still lacking. In this study, a flexural experiment on an original RS-OCT beam subjected to a long-term vehicle cyclical load was conducted in a laboratory. Several interesting phenomena were discovered. Notably, a butt-weld joint typically exists on longitudinal reinforced bars, which may be vulnerable to bending. The RS-OCT beam simultaneously suffered from the double function of atmospheric environment and fatigue during service. Based on the time-dependent and fatigue theories of materials, finite element analysis was performed using the ABAQUS software. The flexural behavior of the RS-OCT beam at various time periods was simulated. Subsequently, the flexural bearing capacities of the beams were calculated. The safety reservation of the RS-OCT beam at various time stages was related to the change in material properties and upgrading of the loading level. The latter plays a dominant role in the service state.

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Section: Simulation Of the Welded Deteriorated Zone Of The Steel Barmentioning

confidence: 99%

Section: Strength Of Concretementioning

confidence: 99%

Research on the Flexural Behavior of a Coastwise RS-OCT Beam That Has Endured Long-Term Fatigue Load for Years

Hou,

Hu,

Zhang

et al. 2023

JMSE

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“…The effect of prestressing CFRP on the fatigue behavior of flexural strengthened RC beams was analyzed in a FE study by Guo et al [57]. Various prestressing levels (0%, 10%, 15%, and 22%) were modelled by applying initial stress values to the CFRP laminates.…”

Section: Numerical Parametric Studies On the Frp/concrete Bondmentioning

confidence: 99%

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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“…A large number of experimental and theoretical studies have found that prestressing CFRP can efficiently utilize the tensile capacity of material. Moreover, the cracking loading and ultimate capabilities of strengthened structures enhance significantly [ 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Full-Scale Damaged Hollow RC Beams Strengthened with Prestressed SCFRP Plate under Four-Point Bending

Zeng

Guo

et al. 2022

Polymers

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The advantages of using prestressed carbon fiber reinforced polymer (CFRP) for strengthening and retrofitting structures have been reported in recent years. In this regard, most of the studies on prestressed CFRP technique have been carried out in the laboratory test with small-scale and no damage (reinforced concrete) RC beam. However, the real structures that need to be retrofitted in service are often degraded or damaged due to early cracking. This paper aims at studying the effect of prestressed CFRP method on full-scale and damaged RC beams. The damaged levels of four full-scale damaged hollow RC beams taken from an old bridge were evaluated. One damaged beam was tested to check the residual capacity, and the other three were strengthened with prestressed composite strengthened CFRP and steel-carbon fiber reinforced polymer (SCFRP). The flexural behavior of non-strengthened and prestressed strengthened beams was investigated. During the experiments, the failure modes, deflection, yield and ultimate load, strains of concrete, steel reinforcements, and SCFRP were measured and analyzed. The results showed that the stiffness at the elastic stage was increased by 64.9%, 66.9%, and 67.1% after strengthened by SCFRP with 30%, 40%, and 60% prestressing level. Moreover, the ultimate load of damaged hollow RC beams were improved by 19.53%, 21.82%, and 31.9%, respectively. The flexural behavior of the severely damaged RC beam with strength reduction coefficient of 0.65 can be recovered after being strengthened by SCFRP with 40% prestressing levels. Meanwhile, SCFRP-concrete interface debonding failure occurred when the prestressing level exceed 60%, and the characteristics of brittle failure became more evident with increased prestressing level of the SCFRP.

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Finite element modeling for fatigue life prediction of RC beam strengthened with prestressed CFRP based on failure modes

Cited by 18 publications

References 21 publications

Research on the Flexural Behavior of a Coastwise RS-OCT Beam That Has Endured Long-Term Fatigue Load for Years

Research on the Flexural Behavior of a Coastwise RS-OCT Beam That Has Endured Long-Term Fatigue Load for Years

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

Flexural Behavior of Full-Scale Damaged Hollow RC Beams Strengthened with Prestressed SCFRP Plate under Four-Point Bending

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