On damaged interfaces in masonry buildings: a multi-scale approach

Maria Letizia Raffa (1) , Frédéric Lebon (2)

1 M&S - Matériaux et Structures
2 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]

The aim of the present work is to propose a new micro-mechanical deductive approach to predict effective mechanical properties of micro-cracked brick/mortar interface in masonry structures. This model, based on a previous study proposed by Rekik and Lebon (2010), represents an innovative and analytically consistent way to describe meso-scale damaging phenomenon localized at the interface between deformable solids. The focal point is to assume the existence of a new material layer between brick and mortar, called interphase. This multi-scale method combines standard homogenization technique (law of mixtures, classical bounds, numerical, random), continuum damage mechanics (CDM) and asymptotic technique in order to obtain the brick/mortar interface constitutive law. In this work it will be shown that only soft behavior interface is considered. It has been found that the variable orientation of micro-cracks induces an evolution of the material simmetry. Moreover, the angle influence on interface's stiffness appears only at higher order terms of the asymptotic expansion.

Domaines: Mécanique des solides [physics.class-ph]; Mécanique des solides [physics.class-ph]

Maria Letizia Raffa, Frédéric Lebon. On damaged interfaces in masonry buildings: a multi-scale approach. 2nd International Conference on Protection of Historical Constructions, May 2014, Antalya, Turkey. 6 p. ⟨hal-01007453⟩