The Theory of Critical Distances to assess failure strength of notched plain concrete under static and dynamic loading

Pelekis, Iason; Susmel, Luca

doi:10.1016/j.engfailanal.2017.07.018

Cited by 17 publications

(21 citation statements)

References 38 publications

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“…This explains why its value is seen to be directly linked with the relevant size of the microstructural heterogeneity characterising the material under investigation [32,33]. As far as unreinforced concrete is concerned, some experimental evidence suggests that L is of the order of the average interaggregate distance [18,34].…”

Section: Fundamentals Of the Tcd Under Mode I Static Loadingmentioning

confidence: 99%

“…This section briefly summarises the key features of the TCD when this powerful design approach is used to perform the static assessment of engineering materials containing stress raisers of all kinds and subjected to Mode I loading. In the next section, by taking full advantage of the work we did in the recent past [18,22,26,37,38], the TCD will be generalised so that it can be used also to design notched unreinforced concrete subjected to in-service static/dynamic Mixed-Mode loading.…”

Section: Fundamentals Of the Tcd Under Mode I Static Loadingmentioning

confidence: 99%

“…As far as the inherent strength is concerned, since the mechanical response of unreinforced concrete under quasi-static loading can be modelled as being predominantly brittle [6], the hypothesis can be formed that, for cementitious materials as well, 0 is invariably equal to UTS. This hypothesis can then be extended also to those situations involving dynamic loading [18]. In other words, the assumption can be made that, under dynamic forces and moments as well, the inherent material strength of unreinforced concrete can directly be taken equal to its dynamic strength, f.…”

Section: Assessing Notch Strength Of Concrete Under Static/dynamic Mixed-mode Loadingmentioning

confidence: 99%

“…Focussing attention on f, according to the large number of experimental results collected and re-analysed by Malvar and Crawford [5], the tensile dynamic strength of unreinforced concrete is seen to increase as the local strain rate increases. This monotonic trend can be modelled by employing two simple power laws [5,18], with an evident change in the exponent occurring as the strain rate approaches 1 mm/mm•s -1 [5]. Similarly, the dynamic fracture toughness as well is seen to increase linearly (in a log-log schematisation) as the local strain rate increases [39,40].…”

Section: Assessing Notch Strength Of Concrete Under Static/dynamic Mixed-mode Loadingmentioning

confidence: 99%

“…While much theoretical and experimental work has been done to quantify and model the static/dynamic behaviour of unreinforced concrete, surprisingly, the detrimental effect of finite radius geometrical features (here termed notches) has so far received just little attention [18]. This lack of systematic research work is certainly surprising especially in light of the fact that, in the near future, additive manufacturing will bring into the concrete engineering discipline unprecedented design freedoms, with this allowing complex forms to be incorporated into innovative structural components [19].…”

Section: Introductionmentioning

confidence: 99%

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Estimating static/dynamic strength of notched unreinforced concrete under mixed-mode I/II loading

Alanazi

Susmel

2020

Engineering Fracture Mechanics

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The Theory of Critical Distances (TCD) is a powerful design tool capable of estimating the strength of notched/cracked materials, with this being done by directly post-processing the linear-elastic stress fields ahead of the stress raisers being assessed. In the present study, an advanced formulation of the TCD is devised to specifically predict static and dynamic strength of notched unreinforced concrete subjected to Mixed-Mode I/II loading. The reliability and accuracy of the design approach being proposed was checked against a large number of experimental results generated by testing plain concrete containing notches of different sharpness, with these experiments being run not only under various degrees of Mode mixity, but also under different values of the nominal displacement rate (i.e., in the range 0.002-35 mm/s). The predictions made by this advanced version of the TCD were seen to fall mainly within an error interval of ±30%, that is, within an error band as wide as the band characterizing the intrinsic scattering of the calibration data. This suggests that that the TCD philosophy can effectively be extended also to the assessment of notched plain concrete subjected to in-service static/dynamic Mixed-Mode loading, with the relevant stress fields being determined by modelling concrete as a linear-elastic, homogeneous and isotropic material.

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Section: Fundamentals Of the Tcd Under Mode I Static Loadingmentioning

confidence: 99%

Section: Fundamentals Of the Tcd Under Mode I Static Loadingmentioning

confidence: 99%

Section: Assessing Notch Strength Of Concrete Under Static/dynamic Mixed-mode Loadingmentioning

confidence: 99%

Section: Assessing Notch Strength Of Concrete Under Static/dynamic Mixed-mode Loadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimating static/dynamic strength of notched unreinforced concrete under mixed-mode I/II loading

Alanazi

Susmel

2020

Engineering Fracture Mechanics

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Mechanical behaviors and failure characteristics of coal-rock combination under quasi-static and dynamic disturbance loading: a case based on a new equipment

Jing,

Wen,

Jiang

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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The dynamic disasters of deep mining coal and rock mass are frequent and easy to be instable. Aiming at the deformation of coal-rock roadway under the coupled static and dynamic load, a new equipment which can simulate the actual situation dynamic environment is used to carry out the coupled static-dynamic loading test of coal-rock combination. The failure law and mechanical behavior of combination are studied. Test results show that weak structure significantly affects mechanical response of coal-rock combination. The coal part with lower strength firstly reaches the crack initiation stress. The strength of the combination is dominated by the coal part. The post-peak stage of the stress–strain curve under the coupled static and dynamic load presents a stepped reduction, which shows yield process. The dynamic load level has a significant effect on the mechanical behaviors of the combination. The elastic modulus decreases under dynamic loading. The peak stress of the combination is positively correlated with the dynamic load level in a certain range, and the peak strain was negatively correlated. The energy accumulation and dissipation are closely related to the failure of the samples. The strain energy is more concentrated in the area where the failure occurs first. The AE energy under dynamic load is developed from the traditional “four-stages” characteristic under static load to three stages. The interval release stage appears because of the appearance of intermittent disturbance load makes the AE energy of the sample change intermittently. The dynamic instability of samples accompanies a sudden increase in AE energy rate, hysteresis loop area and strain. Compared with the shear failure of single lithology sample, the failure mode of the combinations is mainly tensile, and it turns into tensile-shear failure under dynamic load. The fragmentation of samples is different under different failure modes. The fragmentation index can characterize the failure mode and crack propagation characteristics of coal-rock combination. The research provides reference for large deformation dynamic disasters of surrounding rock.

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Water–Cement Ratio on High-Cycle Fatigue in the Theory of Critical Distances of Plain Concrete

Shah

Kueh

Tamin

et al. 2022

Iran J Sci Technol Trans Civ Eng

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The Theory of Critical Distances to assess failure strength of notched plain concrete under static and dynamic loading

Cited by 17 publications

References 38 publications

Estimating static/dynamic strength of notched unreinforced concrete under mixed-mode I/II loading

Estimating static/dynamic strength of notched unreinforced concrete under mixed-mode I/II loading

Mechanical behaviors and failure characteristics of coal-rock combination under quasi-static and dynamic disturbance loading: a case based on a new equipment

Water–Cement Ratio on High-Cycle Fatigue in the Theory of Critical Distances of Plain Concrete

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