A NUMERICAL MODEL FOR QUASI-BRITTLE MATERIALS

Abstract eng:
Complex analysis of massive historical structures that takes into account all geometrical details is still not computationally feasible. Instead, either coupled or uncoupled multi-scale homogenization analysis is often performed whereas the latter one in particular has proved its potential when searching for a reliable estimate of the response of large, generally three-dimensional, structures. In such a case the macroscopic analysis is carried out independently such that the driving material parameters of the macroscopic constitutive model are found from a detailed numerical analysis on the mesoscale. This step constitutes the most important part of the uncoupled multi-scale approach and its success is highly influenced by the proper representation of the material response on the level of individual phases, bricks and mortar. An extension of the constitutive models currently implemented in the ATENA finite element code is proposed. Particular attention is paid to the synthesis of an orthotropic damage model for the description of tensile failure with a new constitutive model capable of representing the material failure in shear and confining pressure. Several simple problems including tension and hydrostatic compression are solved to test the model capability.

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