关键词: 名义应力, 对接焊缝, 疲劳分析, S-N曲线, 循环计数, 蓄水池法, 累计损伤

Abstract: The fatigue load of steel liner in headrace tunnel of a pumped storage power plant during operation is calculated based on nominal stress, the cycle number of fatigue load is counted by use of reservoir method recommended by EN standard and the fatigue strength of the butt weld is determined according to a proper fatigue curve. Moreover, the fatigue of steel liner butt weld is assessed based on Palmgren-Miner theory of linear cumulative damage theory. The assessment result shows that the weld fatigue life meets owner's requirement and the design approach provides a reference for fatigue analysis of steel liner of similar projects.

Key words: nominal stress, butt weld, fatigue analysis, S-N curve, cycle counting, reservoir method, cumulative damage