The annular area of the cylindrical oil storage tank is the part which is received the structural damage from the earthquake force. The design method of the foundation in this area is only to check the bearing pressure from the tank structure to the foundation. However, the deformation of annular plate and foundation are important value at the large earthquake. The safety of this area must be decided by the interaction of foundation and tank structure. This study examined the effect of foundation structure and material on the annular area of the tank by the finite element method. The result from this examination is showing that the crushed stone under the annular area of the tank is important to resist the earthquake force from tank structure.

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