The fatigue failure of baffle wall induced by turbulent flow in the stilling basin of a large hydropower project was systematically researched. Through overall hydraulic model tests, the fluctuating pressure on two sides of the baffle wall were measured and analyzed, the self-vibration characteristics were calculated and the hydraulic resonance was examined. The static and dynamic stresses of the baffle wall were calculated, and the strength of the wall was checked. For segments which don’t meet the strength requirements, reinforcement and crack control arrangements for the wall were calculated. The fatigue failure resistance of the reinforced concrete baffle wall were calculated with two methods, one is based on reference [4], and the other is based on reference [5]. The amount of reinforced concrete bars can be increased to meet safety requirements.
Key words
baffle wall in stilling basin /
flow-induced vibration /
hydraulic model test /
strength check /
reinforcement calculation /
anti-fatigue research
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References
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[2] 林继镛,练继建.二元射流作用下点面脉动壁压的幅值计算[J]. 水利学报,1988,(12):34-40.(LIN Ji-yong, LIAN Ji-jian. Calculation of the Point and Area Wall Fluctuating Pressure Amplitude by Two-dimensional Jets[J]. Journal of Hydraulic Engineering, 1988, (12):34-40.(in Chinese)
[3] SL191—2008,水工混凝土结构设计规范[S].北京:中国水利电力出版社,2008.(SL191—2008, Design Code for Hydraulic Concrete Structures[S].Beijing: Water Resources and Electric Power Press, 2008.(in Chinese)
[4] GB50010—2002,混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.(GB50010—2002, Code for Design of Concrete Structures[S].Beijing: China Architecture & Building Press, 2002.(in Chinese)
[5] 宋玉普.混凝土结构的疲劳性能及设计原理[M].北京:机械工业出版社,2006:289-290.(SONG Yu-pu. Fatigue Behavior and Design Principle of Concrete Structures[M]. Beijing: China Machine Press, 2006: 289-290.(in Chinese)
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