Storage tanks represent one of the most critical components in industrial facilities and building plants, when considering the occurrence of seismic events. The release of dangerous materials, due to their collapse, can be a safety issue in terms of both human life and environmental impact. This paper carries out a seismic performance assessment of a liquid-storage tank installed in an industrial steel moment-resisting frame building. The seismic performance is gauged in terms of fragility curves, which are provided for different limit states affecting the liquid-storage tank. Nonlinear dynamic analyses are performed using two different modelling approaches: the first explicitly accounts for the tank-structure interaction; the other considers the tank as only modelled as a seismic mass. The results discuss the importance of the modelling assumptions to estimate the seismic demand on liquid-storage tanks and corresponding fragility models for different intensity measures. Absolute acceleration floor response spectra are also analysed in detail, concerning the demand characerization. Finally, the study indicates that the intensity measure adopted for secondary components (i.e. peak floor acceleration) is not necessarily optimal threfeore future developments should produce updated fragility curves for non-structural elements, using better performing intensity measures.

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