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针对月牙肋钢岔管顶部出现较大局部应力使管壳厚度大为增加、有限元计算肋板应力受网格剖分影响较大的问题,以安徽绩溪水电站钢岔管为例,探讨了钢岔管基本锥腰线转折角对管壳腰部和顶部局部应力的影响,比较分析了肋板不同单元类型和网格疏密对计算结果的影响。结果表明,钢岔管基本锥腰线适宜转折角为6°～14°,月牙肋采用实体单元模拟更精确,采用板壳单元模拟更简便,肋板网格疏密对应力分布规律影响不明显,仅对最大应力值有影响。
In view of the large local stress at the top of crescent rib bifurcation tube, the thickness of the shell tube is greatly increased, and the stress of fin reinforcement calculated by finite element method is greatly affected by the meshed. Taking the steel bifurcation pipe of Anhui Jixi Hydropower Station as an example, The influence of the basic cone-waist line turning angle of the bifurcated pipe on the local stress at the waist and the top of the pipe shell was analyzed. The influence of different unit types and mesh density on the calculation results was analyzed. The results show that the suitable turning angle of basic cone waist line of steel bifurcated pipe is 6 ° ~ 14 °. The simulation of crescent rib with solid element is more accurate. The plate element simulation is more convenient. , Only affect the maximum stress value.