Title: Fe-analysis of spacing of localized zones in reinforced concrete bars under tension using elasto-plasticity with non-local softening

Author(s): Ł. Widulinski, J. Bobinski, J. Tejchman

Publication: KILW

Volume: 55

Issue: 2

Appears on pages(s): 257-281

Keywords: bond-slip, reinforced concrete, crack, elasto-plasticity, FEM, non-locality, reinforcement

DOI:

Date: 4/1/2009

Abstract:
The paper presents quasi-static 3D FE-simulations of strain localization in a reinforced concrete bar subject to tension. The material was modeled with smeared continuum crack model using an elasto-plastic constitutive law. A Rankine criterion with isotropic softening and associated flow rule was adopted in a tensile regime of concrete. The behavior of reinforcement was described with an elasto-perfect plastic constitutive model. To ensure the mesh-independency, the model was enhanced in a softening regime by a non-local term to include a characteristic length of micro-structure. The FE-analyses were carried out with a different characteristic length, non-local parameter, reinforcement ratio, distribution of the tensile strength, bond between concrete and reinforcement, softening curve, softening rate and energy fracture.