为研究水电站消力池导墙抗疲劳破坏问题,对某大型水利枢纽消力池导墙流激振动疲劳破坏问题进行了系统研究。通过枢纽整体水力学模型试验,测量与分析导墙两侧面的水流脉动压力,进行导墙的自振特性计算与水力共振校核;进行导墙静应力和流激振动响应计算与强度校核;对不满足强度要求的墙段,进行配筋计算与防裂验算,用2种方法对配筋后的导墙进行抗疲劳破坏计算研究,根据抗疲劳要求增加导墙的配筋量,使其满足安全要求。
Abstract
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.
关键词
消力池导墙 /
流激振动 /
模型试验 /
强度校核 /
配筋计算 /
抗疲劳研究
Key words
baffle wall in stilling basin /
flow-induced vibration /
hydraulic model test /
strength check /
reinforcement calculation /
anti-fatigue research
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参考文献
[1] 吴杰芳,张林让.水工结构流激振动水弹性模型研究及应用实例[M].武汉:长江出版社,2008: 8-9.(WU Jie-fang, ZHANG Lin-rang. Study on Flow-induced Vibration of Hydraulic Structure: Hydroelastic Model and Examples[M]. Wuhan: Changjiang Press, 2008: 8-9.(in Chinese)
[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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