Study On Dynamic Response To Earthquake And Hydraulic Exciting Vibration Of In-Plant Overflow Type Hydropower House Structure

Along with the vigorous development of hydroelectric project construction, the capacity and dimension are more and more great, and specific rotate speed advances accordingly. Structure vibration of hydroelectric power station has become the key problem in the safe operation. Some power stations vibrate excessively in certain work area, so their units operation are confined owing to vibration problem. In-plant overflow type hydropower house structure is fresh in pattern and distinct in its layout, which makes comprehensive dynamic property research on in-plant overflow type hydropower house quite necessary.In-plant overflow type hydropower house structure coheres in layout, generally composed of upstream water holding gate, flow channel, downstream water holding gate, machine hall, superstructure etc. It has complex structure, with multi-hollow, which makes bearing force condition of the house structure more complex than other types. At present, deep study on in-plant overflow type hydropower house has not been done. Combining with the experiment of flood discharge in surface hole of Shuhe hydropower house, this paper has done comprehensive dynamic property research on in-plant overflow type hydropower. Several aspects have been done thereinafter:1.The research headway of vibration problem of hydropower house is summarized;2.The method of FEM dynamic computation and the course realized by software are introduced;3.Accurate mode analysis is done to house structure, in which self-vibration characteristics of both wet and dry model are studied and the effect of water on vibration characteristics is expatiated;4.Time process analysis is done to the house structure under hydraulic exciting force according to hydraulic experiment data in the surface outlet hole. The courses of both and single hole sluicing are respectively considered and compared.5.Earthquake dynamic analysis is done to the whole house model including groundsill and water, in which spectrum analysis of modal response decomposed is adopted to study the stress and displacement response of house structure with different transverse joint elevation.Finally the whole paper is summarized, and the problems demanding further research are expected.