Le béton numérique

Roelfstra, P. E.; Sadouki, H.; Wittmann, Folker H.

doi:10.1007/bf02472402

Cited by 136 publications

(49 citation statements)

References 6 publications

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“…Notice that this is possible since the cohesive element methodology here does not require an a priori definition of the possible fracture planes, since cracks are constrained to propagate following the interelement boundaries [29,36,41,7].…”

Section: Meso-structure Generationmentioning

confidence: 99%

“…Thus, different meso-scale models have been tested by several authors for the simulation of concrete behavior and fracture. A first class of models has recourse to the finite-element approach, in which concrete is represented either as a mixture of aggregates in a matrix with an interfacial transition zone between them or using a damage formulation [29,41,6,7,39,24,19]. A second class to simulate concrete behavior involves lattice models [35,2], where the mechanical properties of the lattice beams aim to represent the concrete mesostructure [17,12].…”

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: Meso-structure Generationmentioning

confidence: 99%

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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“…Roelfstra et al (1985) were the first using this approach for concrete and later, Bazant et al (1990) proposed the random particle model. More recently, interface elements were introduced in meso-scale concrete models by , López et al (2008) and Du et al (2013), among others.…”

Section: Introductionmentioning

confidence: 99%

Meso-scale fracture simulation using an augmented Lagrangian approach

Labanda

Giusti

Luccioni

2016

International Journal of Damage Mechanics

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A cohesive zone model implemented in an augmented Lagrangian functional is used for simulation of meso-scale fracture problems in this paper. The method originally developed by Lorentz is first presented in a rigorous variational framework. The equivalence between the stationary point of the one field problem and the saddle point of mixed formulation is proved by solving the double inequality of the mixed functional. An adaptation to simulate fracture phenomenon in the meso-scale via mesh modification is also presented as an algorithm to insert zero-thickness interface elements based on Lagrange multipliers, boarding the non-trivial task of the field interpolation for different crack paths (plain and tortuous). A suitable tool to study the matrix fracture and debonding phenomena in composites with strongly different component stiffnesses that avoids ill-conditioning matrices associated with intrinsic cohesive zone models is obtained. The method stability is discussed using a simple patch test. Some numerical applications to fracture problems taking into account the meso-structure and, particularly, the study of transverse failure of longitudinal fiber reinforced epoxy and the fracture in concrete specimens are included in the paper. Comparing the numerical results with the experimental results obtained by other researchers, the paper introduces a discussion about the influence of coarse-aggregate volume in meso-scale fracture mechanism in concrete L-shape specimens.

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“…They include deformation of crystals, formation of defects, aggregation of crystallites, heat release, local rise in temperature and pressure, phase transformations, amorphization, break of chemical bonds, acceleration of the processes of diffusion, formation of active centers. In the course of activation of concrete (including silicate) mixtures), important is reaching optimum granulometric composition from the point of view of the best laying to achieve maximum density [6]. In addition to the increase in strength of the finished product, rheological properties of construction mixtures after processing (activation) also change [7].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%