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本文研究储液罐在地面水平振动时的辐射阻尼。为了与现行规范相适应,提出了两个质点的数学模型。上部结构的梁式基本周期按项忠权提出的公式计算,并由此导出了储液罐的结构刚度系数。文中所考虑的地基阻抗系数按Veletsos的动力方法计算,是激振频率的函数。数值计算表明:考虑土与结构相互作用影响后储液罐与液体耦联振动的阻尼比由2％增加到3.08％—28.42％,软弱地基上的辐射阻尼远大于结构阻尼。
This article investigates the radiation damping of the tank when it is horizontally vibrated on the ground. In order to adapt to the current specifications, two mathematical models of particles were proposed. The basic cycle of the superstructure beam is calculated according to the formula proposed by Xiang Zhongquan, and the structural rigidity coefficient of the liquid storage tank is derived from this. The impedance coefficient of the foundation considered in this paper is calculated by the Veletsos dynamic method and is a function of the excitation frequency. The numerical calculation shows that the damping ratio of the fluid-storage coupled vibration with soil-structure interaction increases from 2% to 3.08%- 28.42%, and the radiation damping on the soft foundation is much larger than the structural damping.