INVESTIGADORES
HUESPE Alfredo Edmundo
congresos y reuniones científicas
Título:
A Mixture Continuum Approach for Three-Dimensional Analysis of Reinforced Concrete Members using Embedded Crack Finite Elements
Autor/es:
O. MANZOLI; J. OLIVER; A.E. HUESPE; G. DIAZ
Lugar:
Venice (Italy)
Reunión:
Congreso; 8th. World Congress on Computational Mechanics (WCCM8); 2008
Institución organizadora:
IACM
Resumen:
As well known, modeling reinforced concrete behavior requires an approach able todescribe the formation and propagation of multiple cracks in non-homogenous solidscomposed of concrete and steel bars.Embedded strong discontinuity finite elements have recently acquired importantcontributions, mainly related to the increase in robustness and stability. The developmentof an effective technique to track multiple discontinuity paths in two and three dimensionalsolids, based on an analogous thermal problem, also stands out [1, 2]. With these advances,this finite element class currently shows the necessary maturity to represent the complexcrack growth process in reinforced concreteIn this context, as an alternative to the explicit representation of the rebars, the mixturetheory [3] is a suitable option for modeling reinforcement at a macroscopic level, so thatthe steel bars can be embedded in the solid elements, permitting the use of coarser meshes.Using this theory, the effects of the fibers (steel bars) can be added to the matrix (concrete)behavior. For long fibers, as in the case of steel reinforcement bars, a parallel model isemployed, assuming that all constituents share the same strain field. Thus, the compositestress field can be obtained by the sum of stresses supplied by the constitutive model ofeach constituent, weighted according to volumetric fraction. These constitutive models aretaken from available phenomenological models based on standard continuum theories. TheContinuum of Strong Discontinuity Approach (CSDA) is used to model material failure ofthe composite. This methodology, which combines CSDA with the mixture theory, wasfirst proposed by Linero [4] for two-dimensional analyses of reinforced concrete memberswith two orthogonal bundles of fibers.