Some aspects of DE/FE combined method: Model identification and combined method: Coupling DEM and FEM
Résumé
This study deals with impacts on reinforced concrete structures. Its aim is to predict local damage in the vicinity of the impact as well as the global response of the structure. The Discrete Element Method (DEM) seems particularly convenient for the modeling of fractures. The chosen Discrete Elements (DE) are rigid spheres of different sizes. The identification of the DEM material parameters from macroscopic data (Young’s modulus, compressive and tensile strength, fracture energy…) will be presented in the first part. The modeling of a large structure by means of DE may lead to prohibitive calculation durations. A refinement is required in the vicinity of the impact whereas the structure can be modelled by means of a coarse FE mesh far away from the impact area, where the material behaves elastically. Thus a coupled discrete-finite element approach is proposed: the impact zone is modeled by means of DE and elastic FE are used for the rest of the structure. The proposed approach will be described. Finally, an application of this coupling method will be shown by means of the response of a concrete slab impacted by a rocky block.
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