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The effect of seismic uplift on the shell stresses of liquid-storage tanks

机译：地震抬升对储液罐壳体应力的影响

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Previous theoretical studies have shown that tank uplift, that is, separation of the tank base from the foundation, generally reduces the base shear and the base moment. However, there is a paucity of experimental investigations concerning the effect of uplift on the tank wall stresses, which is the principal parameter that controls the seismic design of liquid-storage tanks. This paper reports a series of shake table experiments on a polyvinyl chloride model tank containing water. A comparison of the seismic behaviour of the tank with and without anchorage is described. Stochastically generated ground motions, based on a Japanese design spectrum, and three tank aspect ratios (liquid-height/radius) are considered. Measurements were made of the stresses at the outer shell of the tank, the tank wall acceleration and the horizontal displacement at the top of the tank. While the top displacement and the tank shell acceleration increased when uplift was allowed, axial compressive stresses decreased by between 35% and 64% with tank uplift. The effect of uplift on the hoop stresses was variable depending on the aspect ratio. A comparison of experimental values with a numerical model is provided. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：先前的理论研究表明，储罐隆起，即储罐底部与基础的分离，通常会降低基础剪力和基础矩。但是，关于升力对罐壁应力的影响的实验研究很少，这是控制储液罐抗震设计的主要参数。本文报道了在装有水的聚氯乙烯模型罐上进行的一系列振动台实验。描述了具有和不具有锚固的储罐的地震行为的比较。根据日本设计范围，随机产生的地面运动和三个水箱的纵横比（液体高度/半径）被考虑。测量了储罐外壳处的应力，储罐壁加速度和储罐顶部的水平位移。当允许提升时，虽然顶部位移和油箱壳体加速度增加，但随着油箱提升，轴向压缩应力降低了35％至64％。隆起对环向应力的影响随纵横比而变化。提供了实验值与数值模型的比较。版权所有（c）2015 John Wiley＆Sons，Ltd.

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