Cracking analysis of reinforced concrete structures

Giry, Cédric; Oliver-Leblond, Cécile; Dufour, Frédéric

doi:10.1080/19648189.2014.881756

Cited by 14 publications

(11 citation statements)

References 16 publications

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“…In principle, any model can be used as long as it provides a precise description of local fields. In this contribution, the SBNL damage model applied to the Mazars criterion is chosen. The next step is to assess the crack path either by using for instance a topological search or the global tracking algorithm .…”

Section: Semi‐discrete Approachmentioning

confidence: 99%

“…In order to improve the description of the continuous fields, an evolution of nonlocal interactions should be introduced in computations. In the present contribution, the method proposed in Refs is used. This regularization method, called the SBNL, is characterized by a regularization that takes into account the stress state of the material.…”

Section: Semi‐discrete Approachmentioning

confidence: 99%

“…Those models are able to predict the initiation and the propagation of the cracking and account for size effects. Furthermore, if needed, crack properties (path and opening) can be estimated in a post‐processing phase with a good agreement compared with experimental results . Consequently, continuous damage models are preferred in this contribution.…”

Section: Introductionmentioning

confidence: 97%

“…Consequently, continuous damage models are preferred in this contribution. In this work, the stress‐based nonlocal (SBNL) regularization technique is used to provide a realistic damage field based on the Mazars criterion to represent microcracking and macrocracking during failure. This technique provides sharp strain profiles upon complete failure which allows to deal with multiple close localized cracks without overlapping of their strain profiles .…”

Section: Introductionmentioning

confidence: 99%

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An original semi‐discrete approach to assess gas conductivity of concrete structures

Dandachy

Briffaut

Dufour

et al. 2016

Num Anal Meth Geomechanics

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Summary For civil engineering structures with a tightness role, structural permeability is a key issue. In this context, this paper presents a new proposition of a numerical modelling of leakage rate through a cracked concrete structure undergoing mode I cracking. The mechanical state of the material, considered in the framework of continuum mechanics based on finite element modelling, is described by means of the stress‐based nonlocal damage model which takes into account the stress state and provides realistic local mechanical fields. A semi‐discrete method based on the strong discontinuity approach to estimate crack opening is then considered in the post‐treatment phase. Using a Poiseuille's like relation, the coupling between the mechanical state of the material and its dry gas conductivity is performed. For validation purposes, an original experimental campaign is conducted on a dry concrete disc loaded in a splitting setup. During the loading, gas conductivity and digital image correlation analysis are performed. The comparison with the 3D experimental mechanical global response highlights the performance of the mechanical model. The comparison between crack openings measured by digital image correlation and estimated by the strong discontinuity method shows a good agreement. Finally, the results of the semi‐discrete approach coupled with the gas conductivity compared with experimental data show a good estimation of the structural conductivity. Consequently, if the mechanical problem is well modelled at the global scale, then the proposed approach provides good estimation of gas conductivity. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Semi‐discrete Approachmentioning

confidence: 99%

Section: Semi‐discrete Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An original semi‐discrete approach to assess gas conductivity of concrete structures

Dandachy

Briffaut

Dufour

et al. 2016

Num Anal Meth Geomechanics

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“…This results in a more realistic representation of the evolution of stresses in these situations. For more information about this model and the computation scheme used for this research the reader is referred to [21][22][23].…”

Section: Regularization Modelmentioning

confidence: 99%

Simulation of dynamic behavior of quasi-brittle materials with new rate dependent damage model

Pereira

Weerheijm²,

Sluijs³

2016

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

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Abstract. In concrete often complex fracture and fragmentation patterns develop when subjected to high straining loads. The proper simulation of the dynamic cracking process in concrete is crucial for good predictions of the residual bearing capacity of structures in the risk of being exposed to extraordinary events like explosions, high velocity impacts or earthquakes.As it is well known, concrete is a highly rate dependent material. Experimental and numerical studies indicate that the evolution of damage is governed by complex phenomena taking place simultaneously at different material scales, i.e. micro, meso and macro-scales. Therefore, the constitutive law, and its rate dependency, must be adjusted to the level of representation. For a proper phenomenological (macroscopic) representation of the reality, the constitutive law has to explicitly describe all phenomena taking place at the lower material scales. Macro-scale inertia effects are implicitly simulated by the equation of motion.In the current paper, dynamic crack propagation and branching is studied with a new rate-dependent stress-based nonlocal damage model. The definition of rate in the constitutive law is changed to account for the inherent meso-scale structural inertia effects. This is accomplished by a new concept of effective rate which governs the dynamic delayed response of the material to variations of the deformation (strain) rate, usually described as micro-inertia effects. The proposed model realistically simulates dynamic crack propagation and crack branching phenomena in concrete.

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