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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。
Based on the ANSYS14.0 software, the fluid-solid coupling finite element model of 30,000 m3 large non-anchor liquid storage tank was established, and the numerical analysis of stress and displacement response of horizontal seismic action under the seismic design grade was carried out. The analysis shows that under the action of horizontal earthquake, obvious “elephant foot” deformation occurs near the bottom of the tank wall. The results of stress and strain response show that the equivalent stress in the area where “elephant foot ” deformation occurs is less than the yield strength , While the axial compressive stress exceeds the critical design stress, indicating that the deformation of “elephant foot” is local buckling failure. For large non-anchored liquid storage tanks, Small displacement.