Vulnerability Curves of Existing Italian Industrial Steel Buildings Designed Without Seismic Criteria

The Italian earthquakes of the last 15 years highlighted the significant seismic vulnerability of industrial buildings, which represent structural typologies at high risk due to their noteworthy exposure. The paper concerns a parametric study on a class of Italian existing industrial steel buildings designed before 1980 without anti-seismic criteria. The choice of the specific class of warehouses is based on field surveys carried out filling the CARTIS-GL form in the municipality of Cercola, within the district of Naples. These buildings, having different geometrical dimensions, represent one of the most common steel industrial structures widespread in the Italian territory in those years. Five families of structural models, placed into different geographical areas, are designed with the calculation methods of the reference time. The seismic behaviour of the investigated industrial buildings is investigated through non-linear static analyses. The results allow to plot vulnerability curves to be compared to seismic fragility curves derived from literature research. The comparison among curves is useful to estimate the effectiveness of the literature studies, as well as to evaluate the seismic damages suffered by investigated structures under different earthquake levels.