【作者】 宋兴君；

【导师】 李守义；

【作者基本信息】 西安理工大学 ， 水工结构工程， 2006， 硕士

【摘要】 随着水电工程建设的蓬勃发展,水轮机的容量和尺寸日趋增大,比转速也相应提高,水电站结构振动问题已成为水电站安全运行中的一个关键问题。不少电站在某些工作区域内振动过大,由于振动问题而限制了机组运行。厂内溢流式水电站厂房结构型式新颖,布置方式独特,这使得对厂内溢流式水电站厂房进行比较全面的动力特性研究显得很有必要。厂内溢流式水电站厂房结构布置紧凑,一般由上游挡水闸门、流道、下游挡水闸门、主厂房上部结构等组成,是由多个孔洞组成的复杂结构,使厂房结构的受力条件较其它型式的厂房更为复杂。目前,对厂内溢流式水电站厂房的动力特性尚未深入研究。本文结合蜀河水电站厂房表孔泄洪的试验研究,对厂内溢流式厂房进行了较为全面的动力特性研究,主要做了以下几个方面的工作:1.概述了水电站厂房振动问题的研究进展和本文研究的主要内容;2.介绍了有限元动力计算的方法及软件实现的过程;3.对厂房结构进行了精确的模态分析,分别研究了干湿模型下的结构自振特性,阐述了库水对其振动特性的影响;4.根据试验数据,对厂房结构的表孔泄洪过程进行了时程分析,分别考虑了单孔和全孔两种过流方式,比较了两种过流情况的水力激振作用下的结构动态响应过程;5.对包含地基和库水的厂房整体模型进行抗震分析,采用振型分解反应谱法研究了厂房结构在不同的横缝高程情况下结构的位移和应力响应。最后对全文做了总结,对需要进一步研究完善的问题进行了展望。更多还原

【Abstract】 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.更多还原