考虑SSI效应储油罐的子结构实验方法与数值模拟

提出了应用振动台子结构试验方法来研究考虑土-结构相互作用（SSI）效应储罐的抗震性能,该方法将土体简化为双自由度八参量集总参数模型进行模拟,储罐作为试验子结构应用振动台加载,两部分联机完成振动台子结构试验。该方法能完成大比例尺储罐试验,具有传统试验方法难以比拟的优势。然后,通过数值模拟分析了SSI效应对储罐动力响应的影响。分别研究了不同储液高度和不同地基刚度对储罐位移和加速度响应的影响。研究结果表明：考虑SSI效应时,罐体位移响应和加速度响应均有所减小,土质越软,效果越明显;随着储液高度的增高,位移、加速度反应呈现减小趋势。

Substructure Testing Method and Numerical Simulation of Storage Tank Considering Interaction between Soil and Structure

Substructure testing method with shaking table was proposed for investigating the seismic performance of storage tank considering the soil-structure interaction （SSI）, and numerical simulations were conducted to investigate the influence of SSI on the dynamic performance of storage tank before actual tests. Based on the assumption of elastic semi-infinite foundation, one 2 degrees of freedom 8 parameters soil model was used for simulating the SSI. With the substructure testing method, the soil model was chosen to be the numerical substructure simulated in a computer, and the storage tank was the experimental substructure loaded with shaking table. The proposed substructure testing method for storage tanks has greater advantages than ordinary testing methods. The numerical simulations were conducted for investigating the influence of the SSI on the storage tank with respect to different foundation stiffness and liquid height. The results show that when considering the SSI, both the displacement and acceleration responses of the tank under El Centro ground motion were reduced. The response amplitudes corresponding to softening type soil model is less than the hardening type. The response amplitudes decrease with the increase of the liquid height.