Design and analysis of seismic isolation for 15×10~4 m~3 vertical storage tank

In order to study the factors of seismic isolation design for 15×104 m3 vertical storage tank,the finite element numerical simulation is used to analyze the effects of isolation stiffness,floating roof quality,reservoir fluid density,tank wall thickness,tank wall material elastic modulus,and liquid storage tank height to radius ratio of the tanks on sloshing frequency and liquid-solid coupling ffrequency.Comparison with the time-history analysis results show that: the liquid-solid coupling vibration frequency is sensitive to isolation stiffness.When the isolation stiffness is lower,the liquid-solid coupling stiffness declines and the base shear force becomes small.Isolation stiffness of the tanks hardly affects the frequency of liquid sloshing.In a certain range of the isolation period,the wave height has no amplification effect.In isolation design,the effects of the floating roof can be neglected.The ratio of the storage tank liquid height to the radius of the tank greatly affects the frequency of the liquid-solid coupling and the shaking frequency.The isolation has the design optimization segmentally.The effects of reservoir fluid density,tank wall thickness,material elastic modulus can be neglected.For shaking table test,other materials may be considered to replace the steel and the analysis results do not be affected.