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<p>The nonlinear behaviour of Reinforced Concrete (RC) structures may cause severe problems, such as the collapse of loads below the bearing capacity level. Several nonlinear theories have been created to study the behaviour of the materials, such as the classic fracture and damage mechanics. One of the most recent theories is the Lumped Damage Mechanics (LDM), which uses some concepts of fracture mechanics and classical damage (the damage variable), adopting inelastic hinges to lump the inelastic effects on the edges of the element. Another important approach to damage estimation is the uncoupled damage, which aims to simplify this analysis. This approach uses an elastic-linear analysis combined with damage model failure criteria to evaluate the damage condition in structures. This paper proposed an uncoupled damage analysis, based on the Griffith criterion, for RC structures with different geometries, loads and static conditions. The analysis was carried out in a set of structures using the proposed method, and the results were statistically compared with the ones using LDM and the experimental ones. The uncoupled damage analysis presented quite close results for isostatic structures with higher efficiency. It was observed that the classic nonlinear LDM approach took 270 times longer to finish the same simulation. The model was also able to recover the damage level for a collapsed canopy, serving as an initial diagnosis tool. For hyperstatic structures, the proposed model led to results that were in agreement with the ones obtained by both nonlinear LDM and experimental observations. For the highest load step evaluated, the model suffered a loss of accuracy due to the redistribution of internal forces. However, for all load steps, it was possible to define that the samples were statistically equal. Therefore, it is possible to conclude that the uncoupled approach can estimate the damages with high precision and the critical regions of structures, especially for an initial diagnosis analysis, with a simple application and implementation, helping engineers in practice verify the integrity of structures.</p>

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Damage prediction model for reinforced concrete structures

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Rafael N. Cunha,
  • Rainara S. Gomes,
  • Wayne S. Assis,
  • David L. N. F. Amorim

摘要

The nonlinear behaviour of Reinforced Concrete (RC) structures may cause severe problems, such as the collapse of loads below the bearing capacity level. Several nonlinear theories have been created to study the behaviour of the materials, such as the classic fracture and damage mechanics. One of the most recent theories is the Lumped Damage Mechanics (LDM), which uses some concepts of fracture mechanics and classical damage (the damage variable), adopting inelastic hinges to lump the inelastic effects on the edges of the element. Another important approach to damage estimation is the uncoupled damage, which aims to simplify this analysis. This approach uses an elastic-linear analysis combined with damage model failure criteria to evaluate the damage condition in structures. This paper proposed an uncoupled damage analysis, based on the Griffith criterion, for RC structures with different geometries, loads and static conditions. The analysis was carried out in a set of structures using the proposed method, and the results were statistically compared with the ones using LDM and the experimental ones. The uncoupled damage analysis presented quite close results for isostatic structures with higher efficiency. It was observed that the classic nonlinear LDM approach took 270 times longer to finish the same simulation. The model was also able to recover the damage level for a collapsed canopy, serving as an initial diagnosis tool. For hyperstatic structures, the proposed model led to results that were in agreement with the ones obtained by both nonlinear LDM and experimental observations. For the highest load step evaluated, the model suffered a loss of accuracy due to the redistribution of internal forces. However, for all load steps, it was possible to define that the samples were statistically equal. Therefore, it is possible to conclude that the uncoupled approach can estimate the damages with high precision and the critical regions of structures, especially for an initial diagnosis analysis, with a simple application and implementation, helping engineers in practice verify the integrity of structures.