Damage analysis in steel fibre reinforced concrete under monotonic and cyclic bending by means of acoustic emission monitoring

Vrijdaghs, Rutger; Steen, Charlotte Van; Verstrynge, Els

doi:10.1016/j.cemconcomp.2020.103765

Cited by 50 publications

(17 citation statements)

References 42 publications

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“…As stated above, unloading curves are necessary to differentiate between elastic crack openings, plastic crack openings and to further determine residual stiffnesses, especially after the occurrence of the first crack. In the literature [ 22 , 23 , 39 , 41 , 42 , 43 ] different indicators are proposed to quantify damage development throughout a low-cycle or high-cycle fatigue test. Mechanical indicators that are often mentioned are the plastic part of the crack-opening, the residual stiffness (sometimes referred to as compliance) and the energy that is consumed to open the crack.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…For force-controlled, high-cycle fatigue tests, the damage energy can be interpreted as the portions of the load-CMOD curve enclosed by the hysteresis loops, as shown in Bode et al [ 46 ]. A second approach for such tests is to interpret the trapezoid enclosed by the upper and lower load levels and initial and residual stiffness as the damage energy, an approach taken, for example, in Gebuhr et al [ 41 ], De Smedt et al [ 43 ]. The latter approach is transferable to fatigue tests with a low number of load cycles, such as those investigated in this paper, since residual stiffnesses can also be determined here, thus enabling better comparability with high-cycle fatigue tests.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…Within the scope of the first area, the material behaviour is investigated experimentally with the aim of determining suitable indicators to describe damage development. For this purpose, as well as for calibrating and validating the numerical model, these indicators are needed to describe the development of the deterioration in the post-cracking phase [ 38 , 39 , 40 , 41 , 42 , 43 ]. For the determination of these damage indicators as well as for characterizing low- and high-cycle fatigue behaviour, unloading–reloading cycles are necessary.…”

Section: Introductionmentioning

confidence: 99%

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Damage Evolution of Steel Fibre-Reinforced High-Performance Concrete in Low-Cycle Flexural Fatigue: Numerical Modeling and Experimental Validation

et al. 2022

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This contribution aims to analyze the deterioration behaviour of steel fibre-reinforced high-performance concrete (HPC) in both experiments as well as numerical simulations. For this purpose, flexural tensile tests are carried out on beams with different fibre contents and suitable damage indicators are established to describe and calibrate the damage behaviour numerically using a phase-field model approach. In addition to conventional measurement methods, the tests are equipped with acoustic emission sensors in order to obtain a more precise picture of crack evolution by observing acoustic events. It is shown that, in addition to classical damage indicators, such as stiffness degradation and absorbed energy, various acoustic indicators, such as the acoustic energy of individual crack events, can also provide information about the damage progress. For the efficient numerical analysis of the overall material behaviour of fibre-reinforced HPC, a phenomenological material model is developed. The data obtained in the experiments are used to calibrate and validate the numerical model for the simulation of three-point bending beam tests. To verify the efficiency of the presented numerical model, the numerical results are compared with the experimental data, e.g., load-CMOD curves and the degradation of residual stiffness.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Damage Evolution of Steel Fibre-Reinforced High-Performance Concrete in Low-Cycle Flexural Fatigue: Numerical Modeling and Experimental Validation

et al. 2022

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“…3PBTs are executed as reported in EN 14651 41 on notched beams (

150 mm \times 150 mm \times 660 mm

). More details regarding the test setup and experimental data are described in De Smedt et al 42 The main results are illustrated in Figure 3, where the stress evolution is shown as a function of the CMOD, measured by an LVDT. A comparison is made between the average monotonic experimental curve and the cyclic experimental results.…”

Section: Experimental Testingmentioning

confidence: 99%

Sectional analysis of the cyclic behavior of steel fiber reinforced concrete

Vandecruys

Vrijdaghs

Verstrynge

2021

Structural Concrete

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Steel fiber reinforced concrete (SFRC) is known for improving the tensile post‐cracking fatigue behavior of concrete. This paper presents a method to obtain the cyclic tensile behavior of SFRC through sectional analysis, using a limited amount of input parameters. The analytical model is divided into two parts: a monotonic and cyclic model. The monotonic model calculates the uniaxial stress‐crack width curves or constitutive laws of SFRC that fulfill the beam's equilibrium with the smallest error. Afterwards, when the constitutive law is known, the cyclic model predicts the behavior during progressive load cycles. Two methods are used to implement the damage caused by cyclic loading: based on the experimental stiffness during cyclic direct tensile tests (DTTs) and based on a relation between the plastic crack width and the crack width at unloading. The latter option is preferred as no additional DTTs are needed. The proposed methodology therefore eliminates the need for challenging DTTs and only requires more feasible monotonic three‐point bending tests (3PBTs) for model calibration. The model is validated by means of DTTs and cyclic 3PBTs and its potential for extension to fatigue loading is shown.

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“…The properties of concrete mainly depend on the ingredients of the concrete mix and the used additives [ 6 , 7 , 8 ]. To prevent early age cracking, the concrete that is used to make floors is frequently modified with the addition of fibers [ 9 , 10 ], which are usually made of steel and polypropylene [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Steel and Polypropylene Fibers on the Properties of Horizontally Formed Concrete

Chajec

Sadowski

2020

Materials

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The article presents a comparative analysis of the impact of the addition of steel and polypropylene fibers on the properties of the concrete mixes and hardened concrete used in the concrete floor industry. The behavior of concrete intended for floors is different from conventional structural concrete because it is formed horizontally; until now, the effect of steel and polypropylene fibers on the properties of concrete formed horizontally has not yet been fully understood. Therefore, the aim of this article is to examine this issue and compare the behavior of concrete modified with steel and polypropylene fibers in concrete that is formed horizontally. The following properties of fresh concrete mixes were analyzed: consistency, the content of air-voids, and bulk density. Consequently, the following properties of hardened concrete were analyzed: compressive strength, bending tensile strength, and brittleness. It was confirmed that steel and polypropylene fibers have a different type of effect on the properties of fresh concrete mixes and hardened concrete. Finally, a combined economic and mechanical analysis was performed.

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Damage analysis in steel fibre reinforced concrete under monotonic and cyclic bending by means of acoustic emission monitoring

Cited by 50 publications

References 42 publications

Damage Evolution of Steel Fibre-Reinforced High-Performance Concrete in Low-Cycle Flexural Fatigue: Numerical Modeling and Experimental Validation

Damage Evolution of Steel Fibre-Reinforced High-Performance Concrete in Low-Cycle Flexural Fatigue: Numerical Modeling and Experimental Validation

Sectional analysis of the cyclic behavior of steel fiber reinforced concrete

The Effect of Steel and Polypropylene Fibers on the Properties of Horizontally Formed Concrete

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