| The goal of this paper is the development of an objectivity algorithm for tensile failure of concrete elements based on the smeared cracking formulation for RC Girder with sand cushion. The algorithm has been implemented into LS-DYNA for hexahedron solid elements and correctly accounts for crack directionality effects. Thus enabling the control of energy dissipation will be associated with each failure mode regardless of mesh refinement.[*]The advantage of the proposed technique is that mesh size sensitivity on failure is removed leading to results、 which converge to a unique solution for girder with sand cushion、 as the mesh is refined. The proposed algorithm has been validated by a full-scale prototype test with sand cushion using different cases of mesh refinement.[*]Here、 in order to establish a modification method for material properties of concrete so as to rationally analyze using coarse mesh、 an equivalent fracture energy concept for concrete element with sand cushion is proposed and the applicability was conducted comparing numerical analysis results and experimental results. |
