Dadinkowa水电站厂房蜗壳外围薄壁混凝土受力分析

发布时间：2018-03-02 14:45

本文选题：Dadinkowa水电站　切入点：蜗壳　出处：《水利水电技术》2017年02期 　论文类型：期刊论文

【摘要】：针对国内对水轮机蜗壳外围薄壁混凝土结构研究较少、设计经验欠缺的问题,以尼日利亚Dadinkowa水电站厂房续建项目为典型案例,对水电站蜗壳外围薄壁混凝土结构进行设计分析。建立三维有限元模型,分析蜗壳外围混凝土在正常运行工况和检修工况下的应力,提取内力进行配筋计算;建立蜗壳0°断面的平面有限元模型,分析蜗壳顶部及基坑里衬附近混凝土应力,提取弯矩和轴力进行正截面和斜截面承载力计算。结果表明,基坑里衬附近混凝土尺寸较小,最薄处仅约21 cm,压应力峰值位于内侧,为5.67 MPa,未超过C25混凝土抗压强度;拉应力峰值位于外侧,为1.55MPa,最大拉应力范围较小。从而,混凝土尺寸能够满足斜截面抗剪承载力要求,无需另外设置抗剪钢筋。为保障结构安全,采用一期混凝土凿毛4 cm、配合植筋φ16@1×1 m的措施,基坑里衬采用双层双向配筋和C30混凝土,蜗壳及引水钢管顶部设置弯起φ32@15 cm钢筋提高斜截面承载力。设计经验可为同类工程设计提供参考。
[Abstract]:In order to solve the problem that the thin wall concrete structure on the periphery of turbine volute is less studied and the design experience is lacking in China, a typical case of the continued construction project of Dadinkowa hydropower plant in Nigeria is taken as a typical case. The thin wall concrete structure around the volute of hydropower station is designed and analyzed. The three-dimensional finite element model is established to analyze the stress of the outer concrete in the normal operation condition and the repair condition, and the internal force is extracted to calculate the reinforcement. The plane finite element model of the 0 掳section of the volute is established, the concrete stress near the top of the volute and the lining of the foundation pit is analyzed, and the bending moment and axial force are extracted to calculate the bearing capacity of the normal section and the inclined section. The results show that the size of concrete near the lining of the foundation pit is small. The thinnest part is only about 21 cm, the peak compressive stress is 5.67 MPA, which does not exceed the compressive strength of C25 concrete, and the maximum tensile stress is 1.55 MPA on the outside. Therefore, the size of concrete can meet the requirements of shear bearing capacity of oblique section. There is no need for additional shear reinforcement. In order to ensure the safety of the structure, the first stage concrete chisel 4 cm, with the planting reinforcement 蠁 16 @ 1 脳 1 m, is used in the lining of the foundation pit, and the double-layer two-way reinforcement and C30 concrete are used in the lining of the foundation pit. Bending 蠁 32@ 15cm steel bar on the top of volute case and water diversion pipe can improve the bearing capacity of inclined section. The design experience can provide reference for similar engineering design.
【作者单位】：中国电建集团华东勘测设计研究院有限公司;
【分类号】：TV33

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