Edifici storici in zona sismica: per una programmazione degli interventi, tra economia e sicurezza

The severe seismic events which struck Italy in the latest years have confirmed the notable vulnerability of masonry buildings to seismic actions, definitely showing the importance of a territorial control. In this paper, the results of a simplified seismic analysis of 30 masonry buildings with artistic-historical value are presented. Starting from a critical analysis of the real crack pattern of each building, a speditive methodology is here proposed, which matches the results of the kinematic analysis carried out on the buildings, (able to describe the most dangerous mechanisms for historical masonry buildings: local collapse mechanisms ) with the results of the SIVARS approach (which conversely supplies a safety index connected only to the in-plane mechanisms). The results obtained with this combined procedure are able to focus the most dangerous mechanisms in the analysed building population, giving an intervention priority list by mechanisms rather than by buildings. This allows to optimize the budget in order to raise the minimum safety factor of the whole buildings population, not focusing on the single buildings.