ABSTRACT

Full-capacity large-scale liquefied natural gas (LNG) tanks comprise a steel inner tank and a concrete outer tank. The space between the walls of these two tanks is filled with expanded perlite and a resilient blanket as an insulation layer. It is well known that interactions between the outer tank, insulation, inner tank, and liquid occur under seismic loads. In this study, to investigate the effect of insulation on an LNG tank, a scale model of the tank was constructed, and shaking table tests were conducted with and without insulation at different liquid levels. A comparison of the displacement, acceleration, and axial strain of the tank walls at different test conditions indicates that the insulation exerts good damping effects on the responses of the inner tank wall. Additionally, it has a certain restraining effect on the acceleration of the outer tank wall. However, its damping effect on the displacement and axial strain of the outer tank wall is negligible; in fact, it can even amplify them. Furthermore, most of the maximum seismic responses occur at the full liquid level, for which the effects of the insulation on the tank are more evident than at other liquid levels.

摘要

全容量大型液化天然气（LNG）罐由钢制内罐和混凝土外罐组成。这两个罐壁之间的空间充满了膨胀珍珠岩和作为绝缘层的弹性毯子。众所周知，外罐、绝缘层、内罐和液体之间的相互作用会在地震载荷下发生。在这项研究中，为了研究绝缘对 LNG 罐的影响，构建了罐的比例模型，并在不同液位下进行了有和没有绝缘的振动台试验。不同试验条件下罐壁位移、加速度和轴向应变的比较表明，绝缘对罐内壁的响应具有良好的阻尼作用。此外，对外罐壁的加速度有一定的抑制作用。但其对罐外壁位移和轴向应变的阻尼作用可以忽略不计；事实上，它甚至可以放大它们。此外，大多数最大地震响应发生在满液位，因此绝缘对储罐的影响比其他液位更明显。