Evaluation of numerical uncertainties on the modeling of dry masonry structures submitted to out-of-plane loading, using the NSCD method in comparison with experimental test

Abstract

International audienceMasonry structures are one of the most common housing type built all around the world. Nonetheless computational methodologies implemented in classical engineering soft-ware seem not to be adapted to fine analysis of masonry structures. The Non-Smooth Contact Dynamics method developed by JJ Moreau and M Jean (the Dis-crete Element Method implemented in the software LMGC90) can perform the modeling of divided media and thus seem particularly well adapted to this type of computation. This work aims to better understand the behavior of the algorithm used in the LMGC90 soft-ware in the resolution of this kind of problems. The impact on the local and global behaviors of structures are considered and discussed. Both the notion of reliability of model and the no-tion of quality of the simulation are focused on. This work is particularly based on the comparison between experimental and numerical re-sults obtained with the LMGC90 software. The test consists in the modeling of a simple dry masonry structure placed on a tilting table. Three interaction laws are used to model the Sig-norini-Coulomb condition. The stability of the wall modeled with rigid bodies is studied re-garding with the influence of numerical parameters calibrating the Gauss-Seidel algorithm used to resolve such a multi-contact problem. Local behaviors are also considered as well as CPU effectiveness