The present study investigates the risk analysis of industrial plant. The work done during the doctorate activity is inserted within a research activity very broad and interdisciplinary which seeks to quantify the industrial seismic risk.

The main objective is the definition of a clear classification of industrial constructions from the structural engineering perspective. The study represents a useful support for QRA analysts in seismic areas, because it ensures a simulated design of constructions and processes even when data are not available. After an introduction on the methodology for a quantitative seismic risk analysis a large study of typical industrial equipment has been conducted both in terms of industrial process, to know the service condition, and in terms of geometric and structural characteristic.

Among the various structural equipment presents in a industrial plant has decided to focus attention on the atmospheric storage steel tanks. This choice was determined by different factors. First of all, they are components that are intrinsic hazard due to the fact that very often contain hazardous materials. Moreover, a large database of post earthquake damage exists and finally are present in many industrial plants. For this reasons a seismic fragility analysis of this structure has been made in terms of limit states relevant for industrial risk analysis (Elephant Foot Buckling and base sliding). An MatLab algorithms to integrate equations of motions have been formulated. Advanced FEM analysis have been carried out and a comparison between simplified procedures proposed by Eurocode 8 and used to develop seismic fragility of tanks has been discussed.