Seismic vulnerability assessment and mechanical – based fragility analysis of a masonry clustered building in South Italy

The paper discusses the seismic behaviour assessment of a masonry clustered building, which is a prevalent typology in historical centres, particularly focusing on a case study located in a small town in Southern Italy. Following the introduction about the historical centre, the main architectural and structural features of the selected aggregate are outlined, based on the CARTIS Form, which was developed as part of the DPC – ReLUIS Italian research project. After establishing the characteristics of the building, its seismic assessment is conducted. Non-linear analyses reveal inadequate seismic behaviour in both longitudinal and transverse directions. A consolidating intervention which foresees the application of a seismic coating system is proposed. This integrated approach aims to improve both the seismic and energy performance of the aggregate. In the final part of the work, a comparison is made between the results obtained before and after the intervention. This includes the evaluation of the seismic safety index, as well as the examination of the fragility curves. The objective is to assess the effectiveness of the coating system on the structural units of the aggregate, thereby determining the overall improvement in seismic performance following the intervention.