PSI - Issue 78

Caterina Carbone et al. / Procedia Structural Integrity 78 (2026) 1175–1182

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5. Conclusions In this work seismic vulnerability of different classes of Italian RC buildings was investigated by statistical processing post-earthquake damage data available on web-gis Da.D.O. platform and collected in the aftermath of three strong seismic events: the 2009 L’Aquila earthquake, the 2012 Emilia seismic sequence and the 2016 -2017 Central Italy seismic sequence. National design seismic codes were reviewed to define the main design characteristics on inspected buildings of different ages. Every damage database was critically analysed to extract the only data useful for subsequent statistical elaborations. A global damage level was assigned to each surveyed building accounting for damage detected to vertical structures and infills/partitions. Ground motion was locally estimated by extrapolating PGA values from INGV ShakeMap suitably considering the date of survey with the dates of the main shocks in case of seismic sequence. Damage datasets were integrated with exposure datasets, properly filtered based on experienced seismic motion, to account for the negative evidence of damage. Consistent with exposure data macro-categories of buildings were defined according to age of construction and number of storeys. Cumulative lognormal distribution was selected to describe the probability of reaching or exceeding the different damage levels while the multinomial distribution was adopted to categorize buildings of every macro-category according to sustained damage and experimented seismic action. Height of buildings confirm to be an important parameter influencing seismic vulnerability of RC buildings; at low-damage levels it is more influent than age of construction on seismic vulnerability. Globally, obtained fragility curve reflect the upgrade of seismic regulations and improvement in construction techniques. In future, it would be useful to explore the performance of RC buildings with masonry infills designed according to NTC2008 to evaluate if the advancement in seismic design codes led to a significative reduction of seismic vulnerability.

Fig. 5. Fragility curves for RC buildings for different damage levels, accounting for age of construction and number of storeys.

Acknowledgements This study was supported by the Consorzio POROTON Italia, whose financial and technical assistance is gratefully acknowledged.