SEISMIC RESPONSE OF THE SPHERICAL LIQUID STORAGE TANK
Junwen Zhou 1* and Ming Zhao 1
1 Department of civil engineering, Tongji University, No.1239, Siping Road, Yangpu District, Shanghai, China
The seismic safety of liquid storage tanks has earned a great attention in the lifeline engineering and academic field. A model incorporating with liquid-structure interaction is developed to investigate the seismic response of spherical liquid storage tanks which is widely used in the petrochemical industry. The proposed approach is based on numerical method with the inside liquid considered by finite element for different liquid depth. The results show the influence of the liquid levels on the natural frequencies and indicate that the liquid sloshing has a significant effect on the dynamic characteristics of the structure. With an increase of the liquid level, the natural frequency of the tank system decreases. The seismic response of the spherical tank under horizontal earthquake is obtained with respect to the displacement of the structure, the stress of the tank wall and the column, the tensile stress of the connecting bar, the shear force and the axial force of columns. It illustrates that the liquid-structure interaction is important for the seismic design of liquid storage tanks.
Liquid storage tank; Seismic response; Liquid-structure interaction