The motionequation of the system under horizontal seismic ground motion can be obtained by means ofvirtual displacement principle.Finally,the seismic response of the structure is computed.

• 引入容器的变形假设和确定的液动压力假设，应用虚位移原理可获得体系在水平地震作用下的运动方程，而后考察其地震动响应。