Computers and Concrete

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An implicit damage-plastic model for concrete

  • Received : 2023.04.13
  • Accepted : 2023.10.04
  • Published : 2024.03.25
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Abstract

This paper proposes a numerically-based methodology to implicitly model irreversible deformations in concrete through a damage model. Plasticity theory is not explicitly employed, although resemblances are still present. A scalar isotropic damage model is adopted and the damage variable is split in two: one contributing for stiffness degradation (cracking) and other contributing for irreversible deformations (plasticity). The proposed methodology is thermodynamically consistent as it consists in a damage model rewritten in different terms. Its Finite Element coding is presented, indicating that minor changes are necessary. It is also demonstrated that nonlinear algorithms are unnecessary to model concrete cracking and plasticity. Experimental data from direct tension and four-point bending tests under cyclic loading are compared to the proposed methodology. A numerical case study of a low-cycle fatigue is also presented. It can be concluded that the model is simple, feasible and capable to capture the essentials concerning cracking and plasticity.

Keywords

Acknowledgement

The author would like to acknowledge National Agency of Petroleum, Natural Gas and Biofuels (ANP) and Funding Authority for Studies and Projects (FINEP) for the funding of a research scholarship through PRH-9.1, as well as Brazilian National Council for Scientific and Technological Development (CNPq) and Coordination for the Improvement of Higher Education Personnel (CAPES) for their support to this work.

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