Controlling analysis of friction pendulum system for the seismic isolation of liquid storage tanks

Based on Haroun-Housner model of cylindrical liquid storage steel tanks, die continuous liquid mass is lumped respectively as convective mass, impulsive mass and rigid mass. The corresponding stiffness associated with the lumped mass is calculated depending upon the properties of the tank wall and the liquid mass. The mechanical model and the governing equation of motion of the liquid storage steel tanks isolated with friction pendulum bearings are presented under earthquake ground motions. And the governing equations of motion are solved by using New-mark ' s step-by-step method assuming linear variation of acceleration over small time interval. Earthquake response of the liquid storage tanks isolated with the friction pendulum bearing (FPB) is investigated under the earthquake ground motions. It is observed that FPB is quite effective for reducing the earthquake response of tanks.