Dynamic Identification and Non-Destructive Characterization of a Greek Heritage Building

This paper describes a study carried out on the masonry bell tower of “Annunziata” (Corfu, Greece) , which shows a high damaged scenario and, consequently, a high vulnerability to dynamic and seismic forces. It presents the experimental investigations and results useful to define the finite element model of the tower. The monitoring system consists of several elements properly connected: in total twenty-four accelerometers have been positioned, eight for each of the three floors, according to the orthogonal directions x and y. This configuration has been also determined by the many operative problems about the position of the instrumentation due to the limited accessibility of the structure, both for the main access and to reach the top. It is important to emphasize that the data obtained are not connected to external events detected during the acquisitions, so it is possible to identify with a certain confidence the first six frequencies of the tower and their corresponding mode shapes.