摘要
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 influence of seismic action on the structural dynamical characteristic of large - scale LNG storage tank, the analysis of vibration mode and seismic response for LNG storage tank of 2×10^4m^3 were carried out based on the ANSYS software. The dynamical response characteristics of storage tank under the horizontal, vertical seismic actions and interac- tion among them were obtained. The result shows that with the increase of mode order the mode vibration shape extends from the vault to the tank wall, as well as under the horizontal seismic action the maximum displacement deformations of the horizontal and vertical directions and the equivalent stress of storage tank are all bigger than those under the vertical seismic action. However, the storage tank with thermal insulation layer, the occurring positions of the displacement deformation and the equivalent stress under the horizontal and vertical seismic actions are basically the same with under the horizontal seismic action. All the influences of seismic action, the horizontal seismic action is the main factor influencing the structural dynamical characteristic of large - scale LNG storage tank. For the large - scale LNG storage tanks built in seismically active areas, the strength check under the horizontal seismic action should be taken as the factor evaluating the seismic performance of storage tank.
出处
《低温与超导》
CAS
北大核心
2015年第9期37-43,共7页
Cryogenics and Superconductivity
基金
甘肃省科技重大专项计划项目(1203GKDA001)资助
关键词
大型LNG储罐
地震作用
响应分析
动力特性
Large - scale LNG storage tank, Seismic action, Response analysis, Dynamical Characteristic
