大型水电站厂房弹性垫层蜗壳结构研究

Study on Spiral Case with Elastic Cushion Layer of Large-scale Hydropower Plant Building

钢蜗壳与外围混凝土之间设置弹性垫层是我国大型水电站厂房常采用的一种结构型式,鉴于弹性垫层的最优摩擦系数以及内水压力向外围混凝土传递机理的不确定性,应用ANSYS有限元程序对某大型水电站垫层蜗壳进行钢衬-钢筋混凝土结构三维非线性有限元仿真研究,考虑钢蜗壳与外围混凝土之间的滑移接触特性,研究钢蜗壳与混凝土之间合理的摩擦系数,深入研究蜗壳各径向断面外围混凝土应力、内水压力传递比、承载比等关键问题,为大型水电站厂房的设计研究提供可靠的理论分析。

The elastic cushion layer between the steel spiral case and surrounding concrete is often used as a structural type in the large-scale hydropower plant in China.In view of the uncertainty of the optimal elastic coefficient of friction and the transfer mechanism of internal water pressure to the surrounding concrete,the spiral case with cushion layer of a large-scale hydropower plant is simulated with ANSYS nonlinear finite element program.Then considering the slip contact characteristics between the steel spiral case and surrounding concrete,the more reasonable coefficient of friction between them is studied.At the same time,the key problems for the outer concrete volute stress and the transfer ratio of water pressure and bearing ratio are also studied deeply.All these as mentioned above could provide reliable and theoretical analysis for the design of large-scale hydropower plants.