大型非锚固储液罐水平地震响应数值分析

Horizontal Seismic Response Numerical Analysis of Large Unanchored Storage Tank

基于ANSYS14.0软件建立了3万m3大型非锚固储液罐流固耦合有限元模型,并进行了抗震设计等级下水平地震作用应力和位移响应的数值分析。分析表明:在水平地震作用下,罐壁靠近底部区域出现了明显的"象足"变形;应力与应变响应的结果显示,发生"象足"变形的区域等效应力小于屈服强度,而轴向压应力超过规范设计临界应力,说明"象足"变形为局部屈曲破坏;对于大体积非锚固储液罐,水平地震作用下相对于小体积储罐底板竖向提离的位移较小。

A finite element model of a thirty thousand cubic meter large unanchored storage tank considering fluid solid coupling theory based on ANSYS14. 0 software and numerical analysis of stress and deformation response was investiga- ted under horizontal ground motion according to seismic design level. The results indicate that under horizontal ground motion, elephant foot deformation occurs near the bottom of the tank＇s wall and in elephant foot deformation region, e- quivalent stress is smaller than material yield stress. However, the axial compress stress in such region exceeds the criti- cal stress in design code. As a result, it indicates that elephant foot deformation belongs to local buckling failure. For large volume unanchored storage tanks, vertical uplifting deformation of bottom plane is small compared with small vol- ume tanks.