Computers and Concrete

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Damage prediction in the vicinity of an impact on a concrete structure: a combined FEM/DEM approach

  • Rousseau, Jessica (Universit Joseph Fourier/INPG/CNRS Laboratoire Sols, Solides, Structures) ;
  • Frangin, Emmanuel (Universit Joseph Fourier/INPG/CNRS Laboratoire Sols, Solides, Structures) ;
  • Marin, Philippe (Universit Joseph Fourier/INPG/CNRS Laboratoire Sols, Solides, Structures) ;
  • Daudeville, Laurent (Universit Joseph Fourier/INPG/CNRS Laboratoire Sols, Solides, Structures)
  • Received : 2007.11.01
  • Accepted : 2008.04.01
  • Published : 2008.08.25
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Abstract

This article focuses on concrete structures submitted to impact loading and is aimed at predicting local damage in the vicinity of an impact zone as well as the global response of the structure. The Discrete Element Method (DEM) seems particularly well suited in this context for modeling fractures. An identification process of DEM material parameters from macroscopic data (Young's modulus, compressive and tensile strength, fracture energy, etc.) will first be presented for the purpose of enhancing reproducibility and reliability of the simulation results with DE samples of various sizes. The modeling of a large structure by means of DEM may lead to prohibitive computation times. A refined discretization becomes required in the vicinity of the impact, while the structure may be modeled using a coarse FE mesh further from the impact area, where the material behaves elastically. A coupled discrete-finite element approach is thus proposed: the impact zone is modeled by means of DE and elastic FE are used on the rest of the structure. The proposed approach is then applied to a rock impact on a concrete slab in order to validate the coupled method and compare computation times.

Keywords

References

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