Seismic analysis of base-isolated cylindrical liquid tanks considering fluid-structure interaction

It has been observed that in many earthquakes, the foregoing systems considerably affect on the whole system response reduction. However, in exceptional cases of ground motion by long-period shaking, the base-isolation systems could have adverse effects due to excessive liquid surface displacement. Therefore, the numerical seismic response of liquid storage tanks isolated by bilinear hysteretic bearing elements is investigated under long-period ground motion in the present research. For this purpose, finite shell elements for the tank wall and internal boundary elements for the liquid region are employed. Lastly, fluid–structure equations of motion are coupled with governing equation of base-isolation system, to show the whole system behavior through using several parameters such as the tank geometry aspect ratio (height to radius) and the flexibility of the isolation system

Keywords:

Liquid storage tank , Base-isolation , Boundary elements , Finite elements , Fluid–structure interaction