Seismic risk assessment of existing masonry buildings. A comparison between different methods

As evidenced by many earthquakes occurred from the past to more recent ones, Italy is a country strongly affected by seismic risk. Consequently, the scientific community has always focused its efforts in understanding how to reduce seismic risk and how to prioritize the re-quired interventions. To this, it should be added that, due to limited economic resources, nowadays a new design strategy is pursued, consisting in reducing the seismic risk for as many existing buildings as possible, rather than allocating all the available economic re-sources for few buildings for increasing their safety level up to the new buildings one. In this paper, the seismic risk assessment of a case study, an existing masonry building, is performed according to two methods: the conventional method reported in the Italian M.D. 65/2017 for seismic risk classification of existing buildings, requiring the pushover curves of the building investigated; a probabilistic approach based instead on the fragility curves, de-rived from a macro-seismic analysis of masonry buildings stocks available in Da.D.O. data-base. Finally, the study also shows the results in terms of EALs obtained with parametric fragility curves by varying some buildings characteristics.