Microplane theory represents an efficient and realistic numerical tool for the analysis of engineering materials that require models accounting for anisotropy (inherent, induced, or both), manifested in soils, rocks and other quasi-brittle materials. An important family of microplane models focused on the study of the behaviour of concrete has passed through a long period of evolution and actually posses a robust and powerful formulation. However, the use of this theory to represent the behaviour of geotechnical materials is still lacking its complete implementation within a strong constitutive framework like the theory of elastoplasticity. Many fundamental features related with such implementation will be discussed throughout this paper and some important conclusions from our ongoing research will be presented.
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