水电站, 垫层蜗壳, 有限元计算, 结构设计

Cushion spiral case structure is commonly used in the powerhouses of large-scale hydropower stations. In this study, the three-dimensional finite element method is used to analyze the mechanical characteristics of cushion spiral case structure of a hydropower station. The stress state of the steel spiral case, as well as the cracking range and stress distribution of the reinforced concrete during normal operation under ultimate limit state and serviceable limit state are analyzed and compared. The analysis results have verified the rationality of the selection of spiral case type and provided a reference for the reinforcement design of surrounding concrete of the spiral case.

hydropower station, cushion spiral case, finite element method, structural design