Fracture Analyses of Concrete Structures by the Modified Distinct Element Method

Meguro, Kimiro; Hakuno, Motohiko

doi:10.2208/jscej.1989.410_113

Cited by 48 publications

(33 citation statements)

References 3 publications

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“…The slab is thus modeled as a continuous material with an elastic-brittle constitutive behavior. Yet, similar to what is classically done for concrete (Meguro and Hakuno, 1989;Kusano et al, 1992;Camborde et al, 2000;Hentz et al, 2004), the response of this layer to the dynamic propagation of failure in the WL is also computed with the DE method. In that case, however, the considered elements (grains of size r) have no physical meaning and should only be regarded as entities of discretization similar to the mesh size in FE models.…”

Section: Motivation and Objectivesmentioning

confidence: 99%

Modeling of crack propagation in weak snowpack layers using the discrete element method

Gaume¹,

Herwijnen²,

Chambon

et al. 2015

The Cryosphere

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Abstract. Dry-snow slab avalanches are generally caused by a sequence of fracture processes including (1) failure initiation in a weak snow layer underlying a cohesive slab, (2) crack propagation within the weak layer and (3) tensile fracture through the slab which leads to its detachment. During the past decades, theoretical and experimental work has gradually led to a better understanding of the fracture process in snow involving the collapse of the structure in the weak layer during fracture. This now allows us to better model failure initiation and the onset of crack propagation, i.e., to estimate the critical length required for crack propagation. On the other hand, our understanding of dynamic crack propagation and fracture arrest propensity is still very limited.To shed more light on this issue, we performed numerical propagation saw test (PST) experiments applying the discrete element (DE) method and compared the numerical results with field measurements based on particle tracking. The goal is to investigate the influence of weak layer failure and the mechanical properties of the slab on crack propagation and fracture arrest propensity. Crack propagation speeds and distances before fracture arrest were derived from the DE simulations for different snowpack configurations and mechanical properties. Then, in order to compare the numerical and experimental results, the slab mechanical properties (Young's modulus and strength) which are not measured in the field were derived from density. The simulations nicely reproduced the process of crack propagation observed in field PSTs. Finally, the mechanical processes at play were analyzed in depth which led to suggestions for minimum column length in field PSTs.

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Section: Motivation and Objectivesmentioning

confidence: 99%

Modeling of crack propagation in weak snowpack layers using the discrete element method

Gaume¹,

Herwijnen²,

Chambon

et al. 2015

The Cryosphere

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“…For a two-dimensional analysis, potential element shapes are [5,3,4], Meguro and Hakuno [13], and Thornton [20] in their respective studies. Ting et al [21] employed elliptical elements for their studies of granular materials.…”

Section: Choice Of Element Shapementioning

confidence: 99%

“…Since then, it has been extensively used in analyzing failure in discontinuous media. Thornton and Kafui [20] employed a DE model to study the breakup of agglomerates of circular and spherical particles, while Meguro and Hakuno [13] used a similar model to study the fracture of concrete structures. Trent [22] developed a DE model to study wave propagation through granular materials.…”

Section: Introductionmentioning

confidence: 99%

A discrete element approach to evaluate stresses due to line loading on an elastic half-space

2006

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A new approach to computing sub-surface stresses in an elastic half-space subjected to a line loading is presented. The approach is based on the discrete element method (DEM) in which the material continuum is replaced by a set of convex, rigid, interacting elements connected through visco-elastic fibers. A Hertzian pressure profile with, and without surface traction is applied to a semi-infinite domain created by gluing together discrete elements. Stresses are calculated from the inter-element joint forces that develop due to relative motion of the elements. Newton's laws are employed to simulate the motion of each element. The stress distribution obtained from the discrete element model compares very well with that obtained from continuum elasticity models. The paper illustrates the applicability of the DEM to analysis of contacts at the microlevel and serves as a foundation to further studies in fracture and fatigue of bearing materials.

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“…The details of the method for determining the various parameters in the DEM are given in Meguro and Hakuno (1989). The parameters for the ground model used in this study are shown in Table 1.…”

Section: Parametersmentioning

confidence: 99%

Simulation Analysis of Volcanic Eruption by the Modified Distinct Element Method.

Yamamoto¹,

Hakuno

1991

J,Phys,Earth

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Fracture Analyses of Concrete Structures by the Modified Distinct Element Method

Cited by 48 publications

References 3 publications

Modeling of crack propagation in weak snowpack layers using the discrete element method

Modeling of crack propagation in weak snowpack layers using the discrete element method

A discrete element approach to evaluate stresses due to line loading on an elastic half-space

Simulation Analysis of Volcanic Eruption by the Modified Distinct Element Method.

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