Fragility curves of as-built and retrofitted masonry buildings in Italy

The serious consequences of seismic events in Italy in recent decades have highlighted the need to develop risk mitigation strategies. To evaluate the effectiveness of possible retrofit interventions, vulnerability assessments for as-built cases and retrofitted scenarios have to be carried out. In this work, fragility curves of as-built and retrofitted ordinary masonry buildings built before 1919 are elaborated. In particular, the seismic interventions herein evaluated are strengthening of masonry (MSN1, MSN2), interventions to improve connections (TR), and interventions of floor stiffening (FLR). This paper describes the methodologies to elaborate such fragility curves proposed by the research units of UniPD (University of Padova), UniGEa and UniGEb (University of Genova), developed within the DPC-ReLUIS agreement (Department of Civil Protection - Network of University Laboratories for Earthquake Engineering). The fragility curves obtained by each research unit are presented, and the results are compared with each other.