Continuum damage model for concrete

Jani Vilppo, Reijo Kouhia, Juha Hartikainen, Kari Kolari, Alexis Fedoroff, Kim Calonius

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

A thermodynamically consistent constitutive model for concrete which can correctly predict the failure stress states and failure modes in general multiaxial stress states is presented. The model is based on proper expressions for the specific Gibbs free energy and the complementary form of the dissipation potential. Damaging of the material is described by a symmetric positive definite second order damage tensor. Invariant theory is used in construction of the potential functions which guarantees that the proper symmetry behaviour is satisfied and no artificial symmetrization operations need not to be done. Especially, the failure surface is formulated in such a way that it will mimic the behaviour of the well-known Ottosen’s four parameter failure surface. While testing the model against the experimental results found in literature, the results were in good agreement in uniaxial tensile and compressive loadings as well as in biaxial compression. Besides the correct failure stress states, the model predicts the correct failure modes of concrete: axial splitting along the direction of uniaxial compression and tensile damaging normal to the direction of tension, which is extremely important in analysing complex loading paths. The predictions of the proposed model are compared to the Concrete Damaged Plasticity (CDP) model available in the commercial finite element software Abaqus in uniaxial and equibiaxial cases. The CDP model is calibrated against the uniaxial test results. However, for the CDP model the strain in the loading direction in the biaxial case starts to deviate from the experimental results already before the peak stress, while the present model yields accurate prediction.

Original languageEnglish
Title of host publicationProceedings for the 6th fib International Congress, 2022
Subtitle of host publicationConcrete Innovation for Sustainability
EditorsStine Stokkeland, Henny Cathrine Braarud
Pages260-269
Number of pages10
ISBN (Electronic)978-2-940643-15-8
Publication statusPublished - 2022
MoE publication typeA4 Article in a conference publication
Event6th fib International Congress on Concrete Innovation for Sustainability, 2022 - Oslo, Norway
Duration: 12 Jun 202216 Jun 2022

Publication series

Seriesfib Symposium Proceedings
ISSN2617-4820

Conference

Conference6th fib International Congress on Concrete Innovation for Sustainability, 2022
Country/TerritoryNorway
CityOslo
Period12/06/2216/06/22

Keywords

  • anisotropic damage
  • axial splitting
  • concrete
  • constitutive equations
  • dissipation potential
  • elastic-brittle material
  • failure modes
  • Ottosen’s 4-parameter criterion
  • the specific Gibbs free energy

Fingerprint

Dive into the research topics of 'Continuum damage model for concrete'. Together they form a unique fingerprint.

Cite this