UN PRIMO INVENTARIO DEI DANNI IN EDIFICI PREFABBRICATI A SEGUITO DEL SISMA DELL’EMILIA DEL 2012

The 2012 Emilia (Italy) earthquakes hit a highly industrialized area including several thousands of precast RC buildings. Due to the lack of specific design and detailing for earthquake resistance, these buildings suffered from severe damages and even partial or total collapses in many cases. The present study reports a preliminary data inventory of damages from field surveys concerning 1133 prefabricated industrial buildings. The damage distributions were related first with the epicentral distance. Then, making use of available shakemaps of the mainshocks, empirical vulnerability curves of buildings with different damage grades were developed. It was found that about 90% of severely damaged to collapsed buildings are located at epicentral distances smaller than 14 km and experienced a Pseudo-Spectral Acceleration for a period of 1 second (PSA at 1 s) larger than 0.13g. For 90% of the buildings with slight to moderate damages, the minimum epicentral distance is smaller than 23 km and the maximum PSA at 1 s did not exceed 0.07g. Finally, it has been underlined that 10% of the undamaged buildings are located within 9 km from the closest epicentre and suffered from a maximum PSA at 1 s greater than 0.21g.