Herein, the seismic performance of elevated liquid storage tanks is evaluated through development of fragility curves. The fragility curves are developed under recorded earthquake ground motions, suitably selected for Himalayan region in Himachal Pradesh, India. Effects of various parameters such as, slenderness ratio of the tank, stiffness of the steel staging (tower) are studied. The effectiveness of base isolation technique to enhance the seismic performance of elevated liquid storage tanks is also investigated. Here, two arrangements of the base isolation system [i.e. (i) isolators placed at the bottom of the tank and (ii) isolators placed at the bottom of the supporting tower] are considered and their effectiveness are compared. The effect of soil structure interaction on the seismic performance of elevated liquid storage tank (fixed-base) is also studied for different subsoil conditions. It is observed that the placement of isolation system plays crucial role in enhancing the seismic performance of the tank. However, effect of the tower stiffness is negligible on the effectiveness of the isolation system. Nevertheless, the soil structure interaction has significant influence on the seismic performance of fixed-base tanks.a

Base Isolation System; Seismic Performance; Seismic Performance Enhancement; Slenderness Ratio; Soil Structure Interaction; Steel Staging; Subsoil Conditions; Tower Stiffness