ABSTRACT
This chapter describes the numerical and operational modal analyses performed for the study of the structure and the methodology for the validation of the implemented Finite Element Models (FEM). The modal analysis of a preliminary FEM was executed in order to have an idea of the dynamic behavior of the structure and to guide the design of the on-site sensors positions. Seismic events occurred in Umbria and in Emilia helped to increase the interest to study the behavior of ancient masonry buildings and to design heavy interventions of recovery for the existing assets. The masonry structures represent a remarkable testing ground not only for the technicians that commonly work on the urban context, but also for researchers who try to "standardize" proper analyses procedures, like the ones used for reinforced concrete and steel constructions. Several experimental investigations and assessment methods have been proposed for masonry arch bridges, which constitute a significant proportion of European road and rail infrastructures.
