油罐的大型化发展导致罐壁和罐底的应力分布和变形情况复杂化,因而对油罐的设计水平提出了更高的要求。采用有限元法对20×104m3特大型浮顶油罐进行应力分析,并采用分析设计方法对其展开强度评定。结果表明:在工况条件下,油罐第3～7圈罐壁板、大角焊缝结构突变处、边缘板翘曲开始和结束处等效应力较大,是罐体的危险点。根据强度评定结果对罐壁板及罐底边缘板提出了减小其应力幅值、提高安全系数的优化建议,为20×104m3特大型浮顶油罐的结构设计和材料选用提供了可靠的设计依据。(表2,图5,参7) The large-scale development of the oil tank has led to the complicated stress distribution and deformation of the tank wall and the tank bottom, thereby putting higher demands on the design level of the oil tank. The finite element method was used to analyze the stress of 20 × 104m3 super large floating roof oil tank, and its strength was evaluated by the method of analysis and design. The results show that under the condition of working conditions, the equivalent stress at the beginning and the end of the warp of the edge plates in the 3rd to 7th tank wall of the oil tank, the change of the structure of the large fillet weld is large, which is the dangerous point of the tank. Based on the results of the strength assessment, some suggestions are put forward to reduce the stress amplitude and improve the safety factor for the tank wall and the bottom edge of the tank bottom. This provides a reliable design for the structural design and material selection of the 20 × 104m3 extra large floating roof tank in accordance with. (Table 2, Figure 5, reference 7)