Micro-mechanical model accounting for creep and damage of masonry

International audience ; The main objective of this paper is to predict numerically the viscoelastic behaviour of damaged masonry accounting for the creep of its both components (bricks and mortar). Creep functions of bricks and mortar joints are assumed to follow the Generalized Maxwell (GM) model. The proposed semi-numerical model is based on two steps. The first one estimates the creep behavior of the microcracked mortar by coupling the brittle Griffith's theory to the Ponte-Castañeda & Willis homogenization scheme. The second step consists to apply the finite elements method to predict the local behaviour of a loaded masonry wall. The proposed model is validated with analytical solution available for homogeneous panel submitted to vertical compressive load. Two cases are considered for comparison purpose: masonry with elastic bricks and viscoelastic ones.