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Artículo

A micromorphic model for steel fiber reinforced concrete

Oliver, J.; Mora, D. F.; Huespe, Alfredo EdmundoIcon ; Weyler, R.
Fecha de publicación: 07/2012
Editorial: Elsevier
Revista: International Journal Of Solids And Structures
ISSN: 0020-7683
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ingeniería Civil

Resumen

A new formulation to model the mechanical behavior of high performance fiber reinforced cement composites with arbitrarily oriented short fibers is presented. The formulation can be considered as a two scale approach, in which the macroscopic model, at the structural level, takes into account the mesostructural phenomenon associated with the fiber–matrix interface bond/slip process. This phenomenon is contemplated by including, in the macroscopic description, a micromorphic field representing the relative fiber–cement displacement. Then, the theoretical framework, from which the governing equations of the problem are derived, can be assimilated to a specific case of the material multifield theory. The balance equation derived for this model, connecting the micro stresses with the micromorphic forces, has a physical meaning related with the fiber–matrix bond slip mechanism. Differently to previous procedures in the literature, addressed to model fiber reinforced composites, where this equation has been added as an additional independent ingredient of the methodology, in the present approach it arises as a natural result derived from the multifield theory. Every component of the composite is defined with a specific free energy and constitutive relation. The mixture theory is adopted to define the overall free energy of the composite, which is assumed to be homogeneously constituted, in the sense that every infinitesimal volume is occupied by all the components in a proportion given by the corresponding volume fraction. The numerical model is assessed by means of a selected set of experiments that prove the viability of the present approach.
Palabras clave: High Performance Fiber Reinforced Concrete (Hpfrc) , Failure of Hpfrc , Short Reinforcement Fibers
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/18784
DOI: http://dx.doi.org/10.1016/j.ijsolstr.2012.05.032
URL: http://www.sciencedirect.com/science/article/pii/S0020768312002429?via%3Dihub
Colecciones
Articulos(INTEC)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Citación
Oliver, J.; Mora, D. F.; Huespe, Alfredo Edmundo; Weyler, R.; A micromorphic model for steel fiber reinforced concrete; Elsevier; International Journal Of Solids And Structures; 49; 21; 7-2012; 2990-3007
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