WIT Press

Structural Issues In Seismic Risk Assessment Of Existing Oil Storage Tanks


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G. Fabbrocino, I. Iervolino & G. Manfredi


Large regions in many countries are exposed to earthquakes, thus seismic risk evaluation is a relevant issue and requires specific knowledge development and integration between different skills. Failure of critical constructions can have direct and indirect influence on public safety; in fact, pollution or damages due to explosions can be related to collapse of industrial facilities. In the present paper, after a review of available data concerning industrial plants in Italy with specific reference to their exposure to earthquake actions, the main aspects related to structural design and seismic evaluation of existing facilities for oil storage are discussed and the main features of probabilistic procedures able to give fragility curves of structures and components to be used in seismic risk assessment are outlined. 1 Introduction Italian large industrial facilities are often located in seismic areas. In particular, many existing plants consist of large steel tanks with short relative distance and piping systems for oil distribution. Seismic performance assessment of such layouts is critical, thus traditional force-stress approaches are generally unsatisfactory and probability based procedures have to be used. The latter are aimed to establish reliable correlations between dynamic behaviour and failure probability of each structural element due to their logical and physical connections with quantitative methods as Failure Modes and Effect Analysis