Mitigation of the Seismic Impact on Storage Gas Tanks by Using Isolation System

The paper presents the studies carried out on a big storage gas tank for seismic vulnerability assessment and retrofit through isolation system. This Gasometer, constructed in early eighties, consists steel cylinder of 70 m height 44 diameter. bearing structure is composed by classical frame closed with curved plates. Inside tank, piston-fender rubber sealing system allow variation container volume control pressure. latter represents half mass its position can vary along height. Gasometer as-it-is state assessed execution Incremental Dynamic Analyses, placing particular attention definition possible limit states. Subsequently, base system, adopting Double Curved Surface Sliders, proposed numerically assessed. results comparison between retrofitted supplies important information about effectiveness risk mitigation tanks.