Seismic Risk Assessment of an Industrial Steel Building Part 2: Fragility and Failure Probabilities

This paper describes the probabilistic framework used to assess the seismic risk of an existing industrial steel building, in the framework of performance-based earthquake engineering. The risk assessment is based on incremental dynamic inelastic analyses, carried out on structural models described in a companion paper. Seismic hazard at the site of interest and the associated selection of ground motion acceleration records, on the basis of design earthquakes from disaggregation, are addressed first. Subsequently, fragility curves, related to the structural behaviour only, are obtained for different limit states of industrial interest. The results of the application of this framework are represented by the probabilities of failure for different limit states, which represents a basis for further evaluation regarding expected loss assessment.