软土场地大型LNG储罐考虑桩土相互作用的地震响应分析

在通用有限元软件ANSYS平台上建立了桩-土-LNG储罐相互作用体系的三维整体有限元模型，分析了在IV类软土场地上考虑桩土相互作用对LNG储罐地震响应的影响。结果表明，LNG储罐的基底剪力峰值、倾覆力矩峰值和内罐壁等效应力最大值均有不同程度的减小，而最大晃动波高增大。另外还讨论了不同保温层刚度对LNG储罐地震响应的影响，通过对比发现，保温层刚度对储罐的地震响应具有重要的影响，随着保温层刚度在一定范围内的增加，基底剪力峰值、倾覆力矩峰值和最大晃动波高变化较小，但内罐壁等效应力最大值减小明显。

Seismic Response Analysis of Large LNG Storage Tank Considering the Pile-soil Interaction in the soft site

Based on the finite element analysis program ANSYS, the three-dimension integral finite element model of pile-soil-LNG storage tank interaction system was established, the effect of considering the pile-soil interaction on the seismic performance of LNG storage tank was analyzed in the soft site of class IV. Analysis results show that the peak shear force, peak overturning moment and the maximal Von Mises equivalent stress for the inner steel wall of the LNG storage tank were reduced by different degrees, but the maximum sloshing wave height of the liquid was increased. In addition, the effect of different insulation layer stiffness on the seismic response of LNG storage tank was also analyzed, by contrast, the variation of insulation layer stiffness had important influence on the seismic response of LNG storage tank. With the increase of insulation layer stiffness in a certain range, the peak shear force, peak overturning moment and the maximum sloshing wave height have minor changes, but the maximal Von Mises equivalent stress for the inner steel wall was reduced significantly.