High-cycle fatigue of bond in reinforced high-strength concrete under push-in loading characterized using the modified beam-end test

Baktheer, Abedulgader; Spartali, Homam; Hegger, Josef; Chudoba, Rostislav

doi:10.1016/j.cemconcomp.2021.103978

Cited by 23 publications

(10 citation statements)

References 56 publications

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“…The beam splice test may provide the most realistic conditions, but due to the high costs associated with beam fabrication, this method may be impractical for assessing a large number of parameters governing the bond behavior. [2][3][4] Failure of bond between concrete and rebar usually occurs in one of these two modes: (1) bar pullout failure, which occurs when shear stress in concrete keys between the rebar ribs exceed the shear strength limit of concrete; and (2) splitting failure of concrete, which occurs when the tensile hoop stress exceeds the tensile strength of concrete before the concrete keys between two adjacent ribs are sheared off. Splitting usually occurs in the form of radial cracks in the cross-section or between the bars, and longitudinal cracks parallel to the reinforcement in the case of rather small net covers, which allow the radial cracks to extend up to concrete surface.…”

Section: Introductionmentioning

confidence: 99%

“…Among these methods, the pullout test has been subject to criticism for creating unrealistic stress conditions, that is, compression, around the bar while in reality, the concrete surrounding the bar is in tension. The beam splice test may provide the most realistic conditions, but due to the high costs associated with beam fabrication, this method may be impractical for assessing a large number of parameters governing the bond behavior 2–4 …”

Section: Introductionmentioning

confidence: 99%

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Residual bond‐slip behavior in reinforced concrete members exposed to elevated temperatures

Ghajari

Yousefpour

2022

Structural Concrete

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Many reinforced concrete (RC) structures survive fire events, after which investigation of their residual performance becomes essential. The elevated temperatures experienced by structural members during a fire negatively impact the mechanical properties of concrete and steel, as well as their mutual bond. This paper investigates the bond behavior in RC members exposed to elevated temperatures to help designers check the safety of RC structures after a fire. Thirteen modified beam-end specimens were designed and fabricated with two diameters of longitudinal bar (14 and 22 mm), two concrete strengths (30 and 50 MPa) and two confinement levels (0.8% and 1.6%). After being exposed to a variety of heating regimes and naturally cooling down to room temperature, the specimens were tested by applying a monotonic pull-out force to their eccentric longitudinal bar.The results showed that after short-term exposure to 400, 600, and 700 C, the residual bond strength may decrease by 23%, 58%, and 65%, respectively. The equations for the pull-out failure proposed in the fib Model Code 2010 were found to yield realistic results in terms of upper and lower bounds for the bond behavior under monotonic loading, and the dependency of the residual bond strength on the square root of the residual compressive strength of the concrete was confirmed. Results were used to develop recommendations for the evaluation of the residual bond strength and of the development length in RC members exposed to elevated temperatures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Residual bond‐slip behavior in reinforced concrete members exposed to elevated temperatures

Ghajari

Yousefpour

2022

Structural Concrete

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“…50 Due to the complexity of the interacting dissipative mechanisms in the bond layer in combination with a wide range of fatigue loading scenarios, an objective characterization of bond fatigue (3) based solely on experiments is practically impossible. 51 In addition to the narrow range of validity of empirically obtained properties, the high cost of comprehensive fatigue testing explains the sparsity of research on bond fatigue. The existing literature reports only a limited number of studies using pull-out and beam-end test setups to investigate this phenomenon.…”

Section: Observed Mechanisms Of Bond Fatiguementioning

confidence: 99%

Stress configuration‐based classification of current research on fatigue of reinforced and prestressed concrete

Baktheer,

Goralski,

Hegger

et al. 2024

Structural Concrete

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The limited understanding of the fatigue behavior of reinforced and prestressed concrete members is one of the reasons why many structures do not reach their expected service life. Without a deeper theoretical understanding of the fatigue phenomena in the various fatigue process zones, reliable fatigue life predictions are not possible. This paper provides a classification of the major fatigue process zones and mechanisms in reinforced and prestressed concrete members, accompanied by a brief review of recent developments in design rules, experimental characterization, and modeling approaches specific to each fatigue process zone and mechanism. The limitations of current approaches to fatigue characterization and modeling are also discussed, highlighting the need for further research in this area.

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“…The constitutive behavior describing cyclic damage in the process zone is embedded in the definition of the interface elements. It has been defined using the thermodynamics-based uniaxial interface model proposed in [ 46 , 53 , 54 ]. The model assumes that the development of cyclic load is dominated by a cumulative level of the inelastic relative displacement within the interface.…”

Section: Cumulative Damage-plasticity Based Constitutive Lawmentioning

confidence: 99%

“…This model can be implemented as a time-stepping algorithm, as described in [ 46 ]. The damage accumulation under both monotonic and cyclic loading is described through the modified flow potential by [ 46 , 54 ].…”

Section: Cumulative Damage-plasticity Based Constitutive Lawmentioning

confidence: 99%

Modeling Cyclic Crack Propagation in Concrete Using the Scaled Boundary Finite Element Method Coupled with the Cumulative Damage-Plasticity Constitutive Law

et al. 2023

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Many concrete structures, such as bridges and wind turbine towers, fail mostly due to the fatigue rapture and bending, where the cracks are initiated and propagate under cyclic loading. Modeling the fracture process zone (FPZ) is essential to understanding the cracking behavior of heterogeneous, quasi-brittle materials such as concrete under monotonic and cyclic actions. The paper aims to present a numerical modeling approach for simulating crack growth using a scaled boundary finite element model (SBFEM). The cohesive traction law is explored to model the stress field under monotonic and cyclic loading conditions. In doing so, a new constitutive law is applied within the cohesive response. The cyclic damage accumulation during loading and unloading is formulated within the thermodynamic framework of the constitutive concrete model. We consider two common problems of three-point bending of a single-edge-notched concrete beam subjected to different loading conditions to validate the developed method. The simulation results show good agreement with experimental test measurements from the literature. The presented analysis can provide a further understanding of crack growth and damage accumulation within the cohesive response, and the SBFEM makes it possible to identify the fracture behavior of cyclic crack propagation in concrete members.

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High-cycle fatigue of bond in reinforced high-strength concrete under push-in loading characterized using the modified beam-end test

Cited by 23 publications

References 56 publications

Residual bond‐slip behavior in reinforced concrete members exposed to elevated temperatures

Residual bond‐slip behavior in reinforced concrete members exposed to elevated temperatures

Stress configuration‐based classification of current research on fatigue of reinforced and prestressed concrete

Modeling Cyclic Crack Propagation in Concrete Using the Scaled Boundary Finite Element Method Coupled with the Cumulative Damage-Plasticity Constitutive Law

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