子模型法在球罐应力分析中的应用

工程设计中常需要对大型球罐的支柱连接区进行详细的应力分析。由于球罐设计需考虑风载荷及地震载荷，有限元分析时需对整体的1／2建模，计算规模大，在一定计算机容量下，网格密度受限，使得支柱连接区很难得到较高计算精度的解。子模型技术是解决此类问题最为有效的手段。对一大型球罐采用壳单元对主体结构进行1／2建模，并应用壳到体的子模型技术对支柱连接区进行应力分析，探讨该技术在大型球罐应力分析中的适用性。分析表明，在有限的计算机资源下采用壳到体的子模型技术可得到精度较高的计算结果。

Application of Sub-Model Technique in Stress Analysis of Spherical Tank

The detail stress analysis of the spherical tank connection zone is usually necessary in engineering design. With consideration of wind and seismic load, the finite element model should cover half of the tank, which leads to large amount of calculation. However, it is different to obtain the higher precision solution at the support zone for the limited meshing density with normal computer capacity. The sub - model technology is an effective alternative to solve such kind of problem. In this paper, half of a large spherical tank was initially analyzed by shell element for its main body, and shell - to - solid sub - modeling technology was used for second analysis of the tank support connection zone. It is shown that results with satisfactory precision may be obtained by this method under limited computer capacity.