Download big ben cracked bell9/11/2023 ![]() The complexity is due to the choice of the adequate type of intervention for that particular type of structure, the performance and the cost of it. Their aim is to avoid further damage (or even the full collapse) to the structure due to aftershocks or to other external sources (e.g. In fact, timely provisional interventions are often required in post-seismic scenarios. demolition, shoring, installation of metal rods, and hoops, etc.). In the first phase of a post-earthquake emergency, one of the most critical problems of authorities and technicians is securing damaged structures by means of temporary interventions (e.g. due to accumulated damage in masonry or due to damage on the structure that exposes vulnerabilities). It is not rare that aftershocks may cause more damage than the main shock itself on this typology (e.g. ![]() Masonry heritage structures are among the most vulnerable typologies when seismic swarms strike the territory. Finally, an investigation on the state of connections and of the building itself is carried out via FE model updating. Furthermore, a comparative study is made with similar cases of undamaged masonry towers up to the 6th mode. The dynamic tests were carried out in pre-intervention and post-intervention conditions in order to understand the sensitivity of dynamic measurements to safety interventions. The dynamic response of the structure was evaluated through operational modal analysis using ambient vibrations, a consolidated non-destructive procedure that estimates the dynamic parameters of the bell-tower. ![]() This paper presents the case-study of the bell tower of the Santa Maria Maggiore cathedral, located in Mirandola (Italy). façade tilting, out-of-plane overturning of panels…). In a few structures, partial collapse mechanisms were observed (e.g. After the seismic events of the 20th and 29th of May 2012 in Emilia (Italy), most of the monumental and historic buildings of the area were severely damaged.
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