水电站厂房结构自振特性与止水优化分析

摘要

Wall and column structures above the generator layer are primary concerns for studying structural vibration issues of ground powerhouses in hydropower plants.In this article,the influences on free vibration characteristics of a powerhouse when the wall and column structures are connected by steel frames with large stiffness are studied.Furthermore,the influences of sealing structures on stress distribution of powerhouse structures are also studied with design schemes in ANSYS models.The calculation results show that connecting the wall and column structures with steel frames is favorable for the overall vibration characteristics of powerhouse.But the improvement is not remarkable.On the other hand,the position of sealing structures significantly affects the stress distribution,especially stress distribution of volute concrete,of powerhouse structures under designed working loads.These findings provide useful references for the structural design and sealing structure optimization of powerhouses in hydropower plants.%水电站地面式厂房发电机层以上的墙柱通常是受振动影响最大的部位,为了研究厂房上部结构的连接方式和止水布置位置对结构的受力特性的影响,以某电站厂房为例,采用ANSYS软件,建立厂房上部的墙柱结构有刚度较大的钢架连接和无钢架连接2种模型,分析其对结构自振的影响.基于设计推荐方案,研究止水结构对厂房受力特性的影响,分别在2个具有代表性的工况下进行论证分析.计算成果表明:将厂房上部结构用钢架连接成整体后,对结构的振动特性影响总体有利,但改善幅度不明显;止水位置对蜗壳部位的受力特性影响较为显著.上述研究成果可为水电站厂房的结构设计与止水受力优化提供有益参考.