A MULTILEVEL APPROACH TO SEISMIC RISK ANALYSIS OF RESIDENTIAL BUILDINGS INCORPORATING TERRITORIAL EXPOSURE

Italy’s high seismicity threatens a significant proportion of traditional building stock in Italy, particularly in small and medium-sized urban centers constructed before seismic codes were established. Many of these buildings, dating back to medieval or Renaissance periods, are masonry or stone structures with architectural and cultural value. Traditional seismic analysis primarily focuses on structural capacity, with little importance given to critical aspects such as accessibility during emergencies. This paper introduces a multilevel approach combining seismic susceptibility, evaluated through the Informed Vulnerability Index for Structures (In.V.I.S.), with territorial exposure analysis. The In.V.I.S. index, derived from the CARTIS methodology, offers a rapid and comprehensive structural resistance analysis. Coupling this with territorial exposure enables the evaluation of both physical susceptibility and accessibility during seismic events. The proposed methodology facilitates large-scale, multi-domain analysis, addressing the interplay between building susceptibility and access both pre- and post-event. By integrating these dimensions, the approach provides deeper insights into seismic risks and supports the development of more effective mitigation strategies, especially for small and medium-sized urban centers. As proof of concept, the approach is applied to a set of residential buildings located in two municipalities in northern Tuscany, demonstrating its ability to capture the interconnectedness of structural capacity and emergency accessibility.