The present paper aims at further discussing the mechanics of masonry under compression and at proposing a homogenisation tool that is able to reproduce the results of advanced non-linear finite element computations, at a marginal fraction of the cost. For this purpose, a homogenisation approach previously developed by the authors [
], is extended to the case of masonry under compression. The proposed simplified approach provides results almost equal to very complex non-linear finite element analysis of a masonry representative volume.
It has been generally accepted that the difference in elastic properties of the unit and mortar is the precursor of failure. Uniaxial compression of masonry leads to a state of tri-axial compression in the mortar and of compression/biaxial tension in the unit. Nevertheless, the problem of reproducing the experimental response of the masonry composite from the behaviour of masonry components is rather difficult due to the number of influencing parameters and the complex micro-structure. Models such as the one proposed in the paper allow to better understand the failure of masonry under compression.
Validation of non-linear micro-mechanical homogenization model: (a) failure criterion for masonry; (b) uniaxial tensile loading; (c) uniaxial compressive loading.