考虑保温层的LNG储罐隔震力学模型及响应研究

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摘要为研究LNG储罐的隔震响应及保温层对基底隔震效果的影响，以全容式LNG储罐为研究对象，提出了考虑保温层的LNG储罐基底隔震简化力学模型，并结合有限元分析平台ADINA计算LNG储罐的地震响应。通过对比简化模型与数值仿真计算出的基底剪力、基底弯矩和晃动波高得出：简化力学模型计算出的基底剪力和基底弯矩偏大，晃动波高偏小；隔震模型的差异率小于抗震模型，在LNG储罐的抗震与隔震设计时，采用简化力学模型计算基底剪力和基底弯矩能够保证设防要求，但建议抗震设计时，将简化模型计算出的晃动波高扩大1-1.5倍，隔震设计时，将简化模型计算出的晃动波高扩大2-2.5倍。此外，保温层会影响LNG储罐的基底隔震效果，在进行基底隔震设计时需要考虑保温层的影响。

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	罗东雨1
	孙建刚2
	柳春光1
	崔利富2
	王振2

关键词 ： LNG储罐, 保温层, 简化力学模型, 数值仿真, 基底隔震

Abstract：To study the isolation response of LNG storage tank and the influence of insulation layer on base isolation effect, the base isolation simplified mechanical models of 16×104m3full-capacity LNG storage tank considering insulation were proposed, and the seismic responses of the tank were calculated by simplified mechanical model and finite element analysis platform ADINA.Compared the base shear, bending moment and sloshing wave height of the two methods, the following conclusions were obtained: The base shear and bending moment calculated by the simplified mechanical models are larger than those of by numerical simulation, but the sloshing wave height is smaller; the difference rate of the isolated model is smaller than that of the seismic model, In the seismic and isolation design of LNG storage tank, the simplified mechanical model could be used to calculate the base shear and bending moment, which can ensure the fortification requirements.However, it is suggested that the sloshing wave height calculated by the seismic and isolation model should be expanded by 1-1.5 times and 2-2.5 times, respectively.In addition, insulation has an influence on the base isolation effect of LNG storage tanks, it is necessary to consider the effect of insulation on the base isolation design of LNG storage tank.

Key words： LNG storage tank insulation simplified mechanical model Numerical simulation base isolation

收稿日期: 2019-06-28 出版日期: 2020-11-28

引用本文:

罗东雨1，孙建刚2，柳春光1，崔利富2，王振2. 考虑保温层的LNG储罐隔震力学模型及响应研究[J]. 振动与冲击, 2020, 39(23): 255-262.
LUO Dongyu1, SUN Jiangang2, LIU Chunguang1, CUI Lifu2, WANG Zhen2. Study on isolation simplification model and isolation response of LNG storage tank considering thermal insulation layer. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(23): 255-262.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I23/255

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