大型抽水蓄能电站地下厂房结构自振特性分析  

Analysis of natural vibration characteristics of underground powerhouse structure in a large pumped storage power station

作　　者：肖微 刘国庆 王伟 许亮华[2] 韩承灶 XIAO Wei;LIU Guoqing;WANG Wei;XU Lianghua;HAN Chengzao(Pumped Storage Technology and Economy Research Institute of State Grid Xinyuan Company Ltd,Beijing 100052,China;China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]国网新源控股有限公司抽水蓄能技术经济研究院,北京100052 [2]中国水利水电科学研究院,北京100048

出　　处：《中国水利水电科学研究院学报（中英文）》2024年第2期138-148,共11页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家电网有限公司总部管理科技项目(5419-202243054A-1-1-ZN)。

摘　　要：自振特性分析是抽水蓄能电站地下厂房结构振动研究的基础。以丰宁抽水蓄能电站地下厂房为计算实例,建立了变速机组段地下厂房结构的三维有限元模型。首先采用模态分析方法研究了不同边界条件对地下厂房整体结构及楼板、立柱、楼梯、风罩和机墩等局部结构自振特性的影响,然后分析了丰宁地下厂房可能存在的振源,并对厂房整体及局部结构进行了共振复核。结果表明,上下游边墙弹簧约束条件的增强可以有效提高厂房整体结构自振频率,但对楼板局部自振频率的大小影响不大,对楼梯自振频率也无影响。固定边界使厂房整体结构各阶自振频率显著增大,对楼板、立柱、风罩和机墩等局部结构自振频率影响也较大。在可能的振源作用下,厂房整体结构和各局部结构发生共振的可能性很小。Analysis of natural vibration characteristics is the basis of vibration research of underground powerhouse structure in pumped storage power stations.Taking the underground powerhouse of the Fengning pumped storage power station as an example,a three-dimensional finite element model of the underground powerhouse structure in variable speed unit section was established.Firstly,the influences of different boundary conditions on the natural vibration characteristics of the whole structure and local structures of the underground powerhouse were studied by using the modal analysis method.Then,the possible vibration sources of the Fengning underground powerhouse were analyzed,and the resonance checks were conducted on the whole structure and local structures of the powerhouse.The results indicate that the enhancement of spring constraints on the upstream and downstream side walls can effectively improve the natural frequencies of the whole structure of the powerhouse,but has little effect on the local natural frequencies of the floors and has little effect on the natural frequencies of the stairs.Fixed boundaries can significantly increase the natural frequencies of the whole structure of the powerhouse,and also have a great influence on the natural frequencies of the local structures such as floors,pillars,wind hood and machine pier.The resonance possibilities of the whole structure and local structures of the powerhouse are very low under the actions of possible vibration sources.

关 键 词：抽水蓄能电站 地下厂房结构 边界条件 自振频率 共振复核 

分 类 号：TV731[水利工程—水利水电工程]