大型水电站蜗壳及厂房结构动力分析问题探讨

Dynamic analysis of spiral casings and powerhouses of large-scale hydropower stations

介绍我国大型水电站蜗壳与厂房结构的动力分析研究现状,以及蜗壳与厂房结构和机组运行稳定性之间的关系,并就影响动力反应特性的几个因素,如垫层材料的非线性、蜗壳钢衬和外围混凝土间的非均匀接触、外围混凝土的已有损伤和开裂、流道内巨大水体的存在等进行论述,指出在内源荷载作用下地下厂房及蜗壳结构动力分析数值模型构建中所存在的问题。最后,结合汶川地震中地下厂房的震害,详细论证了进行地下蜗壳及厂房抗震研究的必要性和紧迫性。

The research advances in the dynamic analysis of spiral casings of large-scale hydropower stations as well as the relationship between their dynamic characteristics and the safety operation of turbine generating sets were introduced.The necessity for conducting researches on some factors for the dynamic responses of the spiral casings and hydropower houses were discussed,including the nonlinearity of materials for cushion layer,the non-uniform contact between steel spiral casings and surrounding concrete,the existing damage and cracks in reinforced concrete and the giant water body in flow channels,etc.The existing problems in the establishement of numerical models for dynamic analysis of underground hydropower houses and spiral casings excited by internal forces of water and turbine generating sets were put forward.Finally,based on the seismic damage of large-and middel-scale underground hydropower houses in ＂Wenchuan Earthquake＂,the necessity and impendency of aseismic researches on the underground hydropower houses were demonstrated.