Résumé
The DEMMEFI (Discrete Element Method, Finite Element Method, FIre) research project focuses on developing a numerical tool for post-fire diagnosis of stone masonry structures, with a particular interest in assessing the restoration feasibility for historic buildings like the Notre-Dame de Paris cathedral. This paper presents the validation process of micro-scale thermomechanical behaviour laws integrated into Finite Element Method (FEM) and hybrid FEM/Discrete Element Method (DEM) models, using experimental data from masonry walls subjected to thermal and mechanical loading. Through a methodology involving experimental data analysis, numerical simulations, and model refinement, the study evaluates the effectiveness of the ENDO3D (for 3D anisotropic damage) model in accurately predicting cracking schemes and deflection in masonry structures under fire conditions. Additionally, insights into the influence of key parameters on temperature propagation and out-of-plane deflection are discussed. The findings underscore the importance of these factors in numerical modelling, enabling further work to refine models and ultimately macro-scale simulations of stone masonry structures. This research contributes to advancing engineering practices for the preservation and restoration of cultural heritage sites constructed from stone masonry.