Study on Base Isolation Design of Cylindrical Storage Tank

In high-pressure gas facilities, such as oil refineries, there is a growing demand for enhanced performance to maintain functional integrity during anticipated seismic events. In this study, to ensure this functionality, a base-isolated structure for a flat-bottomed cylindrical tank is modeled, taking the sloshing phenomenon into account. The fundamental effectiveness of the base isolation and the ideal properties of the isolation layer are examined by formulating the equations of motion and conducting time-history response analyses. Therefore, the stored liquid was modeled based on Housner's theory, and the analyses were performed using input ground motions with different periodic characteristics. The results confirmed that long-period ground motion significantly increases the sloshing response, and that enlarging the tank diameter is effective in reducing the response acceleration of the sloshing liquid.