Experimental and numerical modal analysis of a historical masonry bridge

This paper presents the experimental test campaign and the calibration of the finite element model of a historical masonry bridge almost completely built with travertine blocks. The bridge has undergone very complex vicissitudes related mainly to exceptional river floods; it was partially rebuilt twice and other strengthening works were carried out over the time. To determine the mechanical characteristics of the materials, a campaign of experimental tests was planned encompassing onsite measurements of stresses and modulus of elasticity as well as laboratory measurements on specimens taken from the structures. Vibration tests were also carried out to evaluate the modal properties of the bridge. The acquired experimental data were used to calibrate a refined 3D model that has been developed also including the soil deposit. A very good consistency was achieved between experimental and theoretical behaviors.