中文摘要：

基于ABAQUS有限元分析平台，对三峡电站右岸直埋式蜗壳结构选取不同混凝土范围的三个模型进行三维非线性计算，并对蜗壳结构外围混凝土的损伤指标、损伤分布、钢材最大应力及座环柔度值进行了对比分析。结果表明，考虑厂房上下部结构的模型较不考虑上下部结构模型在混凝土的损伤指标、损伤区域、钢材最大应力和座环柔度值都有明显降低，可对后续直埋式蜗壳结构的设计提供参考。

英文摘要：

The static performances of concrete surrounding the spiral case are greatly affected by the super-＆ sub-structures of hydropower house in numerical computation. In this paper, three FEM models were created and nonlinear analyses were performed based on ABAQUS software platform. Tensile damage in concrete, maximum von-Mises stress of sted plates, and compliance value of stay ring were presented and compared for these three numerical models. Results show that tensile damage in concrete, maximum von-Mises stress of steel plates, and compliance value of stay ring decrease significantly in the case considering the effects of super- ＆sub- structures, which can be a reference to the design of directly-embedded spiral case.