筒仓-贮料-地基相互作用系统地震响应研究

Study on Seismic Response of Silo-Stock-Foundation Interaction System

为揭示筒仓-贮料-地基系统在动力作用下的相互响应机理,开展小型振动台筒仓试验,研究了地震荷载作用下筒仓复合结构加速度、位移和土压力的响应规律,并通过数值模拟对筒仓-贮料-地基相互作用系统的地震响应规律进行了分析.结果表明:筒仓仓顶加速度峰值随贮料增加呈先增大后减小的趋势,贮料与筒仓的相对运动对筒仓系统具有减震作用.同一工况筒仓母线上的位移形态相近,位移峰值随着贮料量的增大而增大,沿高度方向上下相差较大.在地震波作用下,土压力上下浮动,但整体上呈现出逐渐上升的趋势,直至稳定在某一数值.研究成果可为地震作用下筒仓结构的安全运营提供一定的理论依据.

In order to reveal the mutual response of silo-stock-foundation system under dynamic action,a small vibration table silo test was carried out.The rules of acceleration,displacement and earth pressure of the silo composite structure under seismic load were studied,and the seismic response of silo-stock-foundation interaction system was analyzed by numerical simulation.Results show that:The peak acceleration of the silo top has a tendency to increase first and then decrease with the increase of the storage material.The relative movement of the storage material and the silo has a shock absorption effect on the silo system.The displacement patterns on the busbar of the same working condition are similar,and the displacement peak increases with the increase of the storage amount,and the difference between the upper and lower sides is larger.Under the action of seismic waves,the earth pressure fluctuates up and down,but the overall trend shows a gradual increase until it stabilizes at a certain value.The research can provide some theoretical basis and reference values for the safe operation of silo structure under earthquake actions.