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Computers and Concrete Volume 33, Number 3, March 2024 , pages 301-308 DOI: https://doi.org/10.12989/cac.2024.33.3.301 |
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An implicit damage-plastic model for concrete |
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Gustavo Luz Xavier da Costa
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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. | ||
| Key Words | ||
| concrete; damage; finite element; plasticity | ||
| Address | ||
| Civil Engineering Department, COPPE, Federal University of Rio de Janeiro, ZIP Code 21941-972, Rio de Janeiro - RJ, Brazil | ||