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The localized strain softening behaviour of concrete has been modelled by two approaches i the stiffness degrading model based on the total stressstrain constitutive relationship, and ii the tangent softening model based on the incremental stressstrain relationship. The models are implemented using a new softening initiation criterion proposed for application in multidimensional finite element analysis. Parametric analyses on plain concrete beams, tested experimentally by other researchers, have been carried out to investigate the required numerical efforts, the mesh objectivity, and the energy dissipation characteristics of the structures. The stiffness degrading model is very stable even when applied with relatively coarse finite element meshes. However, the computational demand of this model is relatively high. The combination of a total stressstrain constitutive relationship to compute the element responses, and an incremental relationship to formulate the stiffness matrix, appears to be computationally efficient and stable, provided that adequately refined finite element mesh is used to model the structure.
Engineering Computations: International Journal for Computer-Aided Engineering and Software – Emerald Publishing
Published: Mar 1, 1993
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