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为研究地震作用对大型LNG储罐结构动力特性的影响,基于ANSYS有限元分析软件对2×104m3LNG储罐进行模态和地震作用下的响应分析,得到储罐在水平地震、竖向地震及水平和竖向地震共同作用下的动力响应特性。结果表明:随着模态阶数的增大,模态振型由拱顶向罐壁延伸;在水平地震作用下储罐水平最大位移变形量、竖直最大位移变形量及等效应力均大于竖向地震作用,而在水平地震作用下储罐水平位移变形、竖直位移变形及等效应力分布规律与水平和竖向地震共同作用相同,水平和竖直方向最大位移变形量及等效应力值近似相等,说明地震对大型LNG储罐结构动力特性影响中水平地震作用是主要的,因此在地震频发地区建设大型LNG储罐时应将水平地震作用下的强度校核结果作为评价储罐抗震性能的一项指标。
In order to study the effect of earthquake on the dynamic characteristics of large LNG storage tank structure, the response analysis of 2 × 104m3LNG storage tank under modal and seismic action was carried out based on ANSYS finite element analysis software. The seismic response of tank on horizontal seismic and vertical earthquake And vertical earthquake under the action of the dynamic response characteristics. The results show that with the increase of modal order, the mode shapes extend from the vault to the tank wall. Under horizontal earthquake, the horizontal maximum displacement deformation, vertical maximum displacement deformation and equivalent stress are all greater than Vertical seismic action, while the horizontal displacement, vertical displacement and equivalent stress distribution of tank under the action of horizontal earthquake have the same interaction with horizontal and vertical earthquake, the maximum horizontal displacement and vertical displacement and equivalent stress The results show that the earthquake is the main factor in the horizontal seismic response to the dynamic characteristics of a large LNG tank structure. Therefore, when building a large LNG storage tank in an earthquake-prone area, the strength check result under the horizontal earthquake should be used as the evaluation tank Seismic performance of an indicator.