石油战略储备对保障国民经济和国防有着不可估量的作用，建造在沿海软土地基上的大型储油罐，因罐液晃动周期长，地震波成份丰富，其抗震性能是极为重要的设计指标。.本项目研究饱和土桩基上带隔板的大型储罐动力学特性及其地震响应，将系统划分为两部分：下部的饱和土—群桩基础子系统和上部的储罐—液体—隔板子系统。对于下部子系统，计入施工对土的扰动影响，用双剪切模型分析群桩基础的动力阻抗，用复Chebyshev多项式拟合阻抗函数，建立适用于时域分析的递归集总参数模型。对于上部子系统，将复杂流体域沿隔板划分成若干个具有连续边界条件的子域，用叠加法得各子域内流体速度势的解，用等效弹簧—质量模型替代罐内的液体和隔板简化分析和计算过程。综合两个子系统得到整个系统的常微分控制方程，数值积分得时域解。以液面波高、罐底剪力和力矩为指标，优化隔板参数提升储罐的抗震性能。用剪切土箱消减土体的边界效应，实验验证分析方法的正确性。

Oil strategic reserve has an immeasurable effect on national economy and national defense. Due to the long sloshing period of liquid in the tank and the abundant components of seismic waves, the seismic performance of the large-size storage tank built on the soft coastal soil foundation is an important design index. .This project studies the dynamic properties and seismic response of the large-size storage tank on saturated soil. The system is divided into two parts: the lower saturated soil-pile group subsystem and the upper tank-liquid-baffle subsystem. For the lower subsystem, considering the soil disturbance effect from construction the double shear model is used to study the dynamic impedance of pile group. The impedance function is fitted by the complex Chebyshev polynomials. The recursive lumped parameter model is developed for the time-domain analysis. For the upper subsystem, the complicated liquid domain is divided into a series of regular sub-domains with continuous boundary conditions along the baffles. The solution of the velocity potential in each sub-domain is obtained by using the superposition method. The equivalent spring-mass model is used to replace the liquid and baffles in the tank to simplify the analysis and calculation process. Synthesizing two subsystems obtains the ordinary differential control equation of the whole system. The time-domain solution is obtained by using numerical integration. The wave height of the liquid surface, the shear force on the tank bottom and overturning moment are taken as the design index to optimize the baffle parameters for improving the seismic performance of the tank. Using the shear soil box to reduce the boundary effect of the soil, the correctness of the analytical method is verified by the experiments.