Nonlinear FE model updating for masonry constructions via linear perturbation and modal analysis

This paper describes the automated nonlinear model updating procedure for masonry structures implemented in the NOSA-ITACA code. The algorithm, aimed at matching numerical and experimental natural frequencies and mode shapes, combines nonlinear static analysis, linear perturbation and modal analysis and allows fine-tuning the free parameters of the model. The numerical method is applied to two simple case studies, which prove its effectiveness.