Effect of loading rate on the strength of concrete subjected to uniaxial tension

Rossi, Pierre; Mier, J.G.M. van; Toutlemonde, François; Maou, F Le; Boulay, Claude

doi:10.1007/bf02473042

Cited by 138 publications

(53 citation statements)

References 3 publications

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“…Whereas, experimental results have shown that energy dissipation increases with the loading rate [33,3]. Although, there is a general agreement on this phenomenological behavior, it is still not clear which should be the mechanisms or physics which govern it.…”

Section: A Rate-dependent Cohesive Lawmentioning

confidence: 98%

“…One of the biggest limitations is how to attach properly the specimen to the testing machine. Therefore, some authors have used, for high strain rates, an indirect method employing the Hopkinson bar [33,3]. In this case, a compressive wave, sent to the specimen, travels through the sample until it finds the free boundary and reflects back already as a tensile wave.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the meso-structure in dynamic fracture simulation of concrete under tensile loading

Snozzi

Caballero²,

Molinari

2011

Cement and Concrete Research

115

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We investigate the dynamic behavior of concrete in relation to its composition within a computational framework (FEM). Concrete is modeled using a meso-mechanical approach in which aggregates and mortar are represented explicitly. Both continuum phases are considered to behave elastically, while nucleation, coalescence and propagation of cracks are modeled using the cohesive-element approach. In order to understand the loading-rate sensitivity of concrete, we simulate direct tensile-tests for strain rates ranging 1-1000 s −1. We investigate the influence of aggregate properties (internal ordering, size distribution and toughness) on peak strength and dissipated fracture energy. We show that a rate independent constitutive law captures the general increase of peak strength with strain rate. However, a phenomenological rate-dependent cohesive law is needed to obtain a better agreement with experiments. Furthermore, at low rates, peak strength is sensitive to the inclusions' toughness, while the matrix dominates the mechanical behavior at high rates.

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Section: A Rate-dependent Cohesive Lawmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Influence of the meso-structure in dynamic fracture simulation of concrete under tensile loading

Snozzi

Caballero²,

Molinari

2011

Cement and Concrete Research

115

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“…Among all the properties of UHTCC, the tensile response is the most important. Concrete is strain rate dependent in terms of its tensile strength, tensile elastic modulus, and ultimate tensile strain (Reinhardt, 1985;Rossi et al, 1994;Ross et al, 1995;Malvar and Ross, 1998;Xiao et al, 2001;Yan et al, 2005). The respective properties of UHTCC will largely determine its suitability in seismic and protective engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Rate dependence of ultra high toughness cementitious composite under direct tension

2016

J. Zhejiang Univ. Sci. A

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Ultra high toughness cementitious composite (UHTCC) usually shows strain hardening and multiple cracking under static tension loads. In practice, structures could be exposed to high strain rates during an earthquake. Whether UHTCC can maintain its unique properties and provide high structural performance under seismic loading rates largely determines whether it can successfully fulfil its intended function. To determine the rate dependence of UHTCC, uniaxial tensile tests with strain rates ranging from 4×10 −6 s −1 to 1×10 −1 s −1 were conducted with thin plates. The experimental results showed that UHTCC had significant strain hardening and excellent multiple cracking properties under all the rates tested. The ultimate tensile strain lay in the range of 3.7% to 4.1% and was almost immune to the change in strain rates. The rate of 1×10 −3 s −1 seemed to be a threshold for dynamic increase effects of the first crack tensile strength, elastic modulus, ultimate tensile strength, and energy absorption capability. When the strain rate was higher than the threshold, the dynamic increase effects became more pronounced. The energy absorption capability was much higher than that of concrete, and the average ultimate crack widths were controlled below 0.1 mm under all rates. Several fitting formulas were obtained based on the experimental results.

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“…Concrete testing has been conducted under various loading rates at the material and structural levels [1][2][3][4][5][6]. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Failure Behavior of RC Structures Under Impact Loads Based on Rigid-Body-Spring Models

Hwang¹,

Bolander²,

Lim³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract:In this study, the dynamic behavior of reinforced concrete (RC) beams under impact loads is simulated considering the rate dependency of concrete mechanical properties. The mechanical properties (e.g. strength, elastic modulus, and fracture energy) of concrete increase under high rates of loading. This increase is often depicted in terms of a dynamic increase factor (DIF) curve. Generally, the DIF value rapidly increases in the regime of high strain rates, greater than 1 s -1 . The rate dependency of concrete has to be considered in the simulation of concrete under impact load. Herein, a three-dimensional dynamic model, comprised of rigid-body-spring elements fitted with rheological units, is validated through comparison with existing experimental results. The validated model is used to simulate the failure of RC beams, which changes under high loading rates. It is shown that the severity of diagonal shear failure increases with loading rate. With further development, the model can be used to understand the behavior of RC structures subjected to various forms of impact loading.

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Effect of loading rate on the strength of concrete subjected to uniaxial tension

Cited by 138 publications

References 3 publications

Influence of the meso-structure in dynamic fracture simulation of concrete under tensile loading

Influence of the meso-structure in dynamic fracture simulation of concrete under tensile loading

Rate dependence of ultra high toughness cementitious composite under direct tension

Failure Behavior of RC Structures Under Impact Loads Based on Rigid-Body-Spring Models

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