三峡水电站直埋式蜗壳结构自振特性

Natural vibration characteristics of direct embedded spiral cases of Three Gorges Hydropower Station

直埋式蜗壳外围混凝土在内水压力作用下会产生损伤,损伤必将对结构的刚度和自振特性产生影响.以三峡水电站15号机组直埋式蜗壳方案为研究对象,利用有限元法计算了结构的自振特性.在此基础上,通过对水电站厂房内振源的分析,进行了结构共振校核.对比结构损伤前后的结果,可得出结论:直埋式蜗壳的自振特性对其抗振性能无明显不利影响.

Damage in concrete will come into being when direct embedded spiral case is under high internal water pressure, and the damage will affect the stiffness and the natural vibration characteristics of the structure. In accordance with the direct embedded spiral case scheme of Three Gorges Hydropower Station, a computation of natural vibration characteristics of the structure is carried out by means of FEM. The structural resonance within the Three Gorges Hydropower Station is verified based on the analysis of possible vibration sources in the power house. Comparing the results of the undamaged spiral case with the local damaged, a conclusion is drawn that natural vibration characteristics of the direct embedded spiral cases have no evident adverse effects on the power house.