A detailed numerical framework for seismic analysis of liquid storage tanks considering soil-structure interaction (SSI) is presented. Lumped mass model for the tank and finite element approach for the soil domain are adopted. Effects of SSI on seismic performance of ground supported and elevated liquid storage tanks, with fixed base and base isolated conditions, are studied under near-field and far-field ground motions. Effect of SSI on fixed base tanks is found to be similar under different types of ground motions. Nevertheless, effectiveness of isolation systems with different stiffness characteristics depends on soil type, tank slenderness ratio, and ground motion types.

Base Isolation; Far-Field Earthquak; Elaminated Rubber Bearing; Lead Rubber Bearing (Nz System); Liquid Storage Tank; Near-Field Earthquake; Seismic Response; Soil-Structure Interaction (Ssi).