模块支墩结构同时承受上部模块载荷与船体载荷，是FPSO的关键部位，对其进行强度分析很有必要。为提高计算效率，通常在三舱段计算中采用子模型方法计算模块支墩结构的应力。以嵌入式方法的计算结果为基准，分别探究了子模型方法对高腹板模块支墩和低腹板模块支墩强度分析的适用性，发现后者的计算精度对舱段分析中粗网格模型的刚度准确性非常敏感。考虑到子模型方法的计算精度主要取决于粗网格模型和子模型之间刚度的匹配性，为了消除这种不确定影响，提出一种修正子模型方法，通过修正模块支墩载荷来抵消模型之间刚度的差异。结果表明，修正子模型方法在很大程度上消除了强度校核的误判风险，使修正前后计算应力的误差从12.4%降低为1.3%。
The module support structure, bearing both the upper module load and the hull load, is a critical component of FPSO, and it is necessary to conduct strength analysis on it. To improve computational efficiency, the sub-model method is usually used in the three-cargo-holds model for stress analysis of module structure. Taking the embedding method as benchmarks and exploring the applicability of sub-model method for strength analysis of the high web module structure and the low web module structure, it is found that the computational accuracy of the latter is highly sensitive to the stiffness accuracy of the coarse mesh model in three-cargo-holds analysis. Considering that the computational accuracy of sub-model method mainly depends on the matching of local stiffness between the coarse mesh model and the sub-model, to eliminate the effect of this uncertainty, a modified sub-model method that eliminates the difference in local stiffness between two models by adjusting the module structure load is proposed. It shows that the modified sub-model method largely eliminates the risk of misjudgment in strength checking, and reduces the error in calculating stress before and after correction from 12.4% to 1.3%.
2025,47(17): 45-51 收稿日期：2024-12-9
DOI：10.3404/j.issn.1672-7649.2025.17.008
分类号：U663.7
作者简介：吴文开(1996-),男,硕士,助理工程师,研究方向为船体结构设计与分析
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