Abstract In this study, a scale model of a liquefied natural gas (LNG) storage tank was designed to carry out a shaking table test, the main position of insulation layer on tank and the site effect were investigated under different ground motions. The test results show that there is an obvious interaction between the insulation layer and the liquid-solid coupling position of the storage tank, and the seismic response of the tank was related to the frequency of the ground motions, the site effect should be considered when analysing the seismic response of liquid-solid coupling structures. Based on the test results, a simplified mechanical model for the seismic design of LNG storage tanks that considered the insulation layer was constructed, and the simplified mechanical model was verified via a numerical simulation method. Moreover, based on the results of the 16 × 104 m3 LNG storage tank simplified mechanical model, the base shear and bending moment were reduced by 20%–25% on average, the acceleration and displacement of the inner tank wall were reduced by 40% on average after filling the insulation. In the seismic design of large scale LNG storage tanks, considering the damping effect of insulation is helpful to save design capital, and ignoring the damping effect of insulation will make the design conservative.

中文翻译：

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液化天然气储罐简化力学模型及地震反应分析

摘要 本研究设计了液化天然气(LNG)储罐的比例模型进行振动台试验，研究了储罐保温层的主要位置以及不同地震动下的场地效应。试验结果表明，保温层与储罐液固耦合位置存在明显的相互作用，储罐的地震响应与地震动频率有关，应考虑场地效应。分析液固耦合结构的地震反应。根据试验结果，构建了考虑保温层的LNG储罐抗震设计简化力学模型，并通过数值模拟方法对简化力学模型进行了验证。而且，根据16×104 m3 LNG储罐简化力学模型结果，基础剪力和弯矩平均降低20%~25%，罐内壁加速度和位移平均降低40%填充绝缘层后。在大型LNG储罐的抗震设计中，考虑保温的阻尼效应有助于节省设计资金，而忽略保温的阻尼效应会使设计趋于保守。