Numerical modeling of the fracture process in reinforced concrete by means of the continuum strong discontinuity approach. part i: formulation
Reinforced concrete structures generally refers to beams, co- lumns and walls which are constituted by complex lattices of steel bars embedded in a concrete matrix, exhibiting multiple cracks due to high external loads. This paper presents the for- mulation of a numerical model aimed at describing t...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | Colombia |
| Institución: | Universidad Nacional de Colombia |
| Repositorio: | Repositorio UN |
| Idioma: | español |
| OAI Identifier: | oai:repositorio.unal.edu.co:unal/29641 |
| Acceso en línea: | https://repositorio.unal.edu.co/handle/unal/29641 http://bdigital.unal.edu.co/19689/ http://bdigital.unal.edu.co/19689/2/ http://bdigital.unal.edu.co/19689/8/ |
| Access Level: | acceso abierto |
| Palabra clave: | Ingeniería Civil Ingeniería de Transporte mecánica computacional mecánica de la fractura discontinuidades fuertes teoría de mezclas concreto reforzado Civil Engineering Transport Engineering computational mechanics fracture mechanics strong discontinuity mixture theory reinforced concrete |
| Sumario: | Reinforced concrete structures generally refers to beams, co- lumns and walls which are constituted by complex lattices of steel bars embedded in a concrete matrix, exhibiting multiple cracks due to high external loads. This paper presents the for- mulation of a numerical model aimed at describing the frac- ture process in reinforced concrete, from the volumetric ratio of concrete and steel. Crack formation and propagation in a composite material is described in the model by an enhanced strain field, such as that established in the continuum strong discontinuity approach and mixture theory. The composite material is constituted by a concrete matrix and one or two steel bar orthogonal packages. The steel and concrete are re- presented by a one-dimensional plasticity model and a scalar damage model having different tension and compression strength, respectively. The dowel action and the bond-slip effects between the bars and the matrix are described with additional models relating component material stress and strain. It is concluded that the proposed model can easily be implemented in the finite element method, due to several conventional nonlinear numerical process characteristics which remain. The model would also allow the problem to be analysed at macroscopic scale, thereby avoiding a finite e- lement mesh having to be constructed for each component material and its interaction effects and reducing computa- tional costs. |
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