抽水蓄能电站主厂房楼梯结构抗振性能研究

Study on Vibration Resistance of Stairs in Pumped Storage Power Station

为了研究抽水蓄能电站厂房内不同楼梯结构型式振动特性的差异,本文结合某实际工程建立三维有限元模型,探讨了楼梯模拟方式,对4种楼梯结构型式的自振特性及脉动压力作用下的动力响应进行了研究.结果表明,按照实际模拟楼梯踏步的几何形态可使计算结果更加精确,但简化踏步模拟的同时计入踏步的质量也能取得较好的结果.在楼梯间增加侧墙或在梯段与平台连接处增加结构柱的方式,可以显著提高楼梯结构的自振频率,降低楼梯结构的振动位移,尤其是增加侧墙的方式适用的频率范围更广,是提高厂房楼梯结构抗振性能的有效措施.

In order to study the pumped-storage power station in differences between the stair structure vibration characteristics of the plant,combining the actual conditions,a three-dimensional finite element model of the underground power plant was set up in this paper,and the stair simulation method was discussed.Then simulation of stair step,natural characteristics of four kinds of stair structure and the dynamic response under the action of pulse pressure were studied.The results show that the simulation results are more accurate when the steps are simulated according to the actual situation,but good results can also be obtained when the steps are simplified and the quality of the steps is taken into account.In stairwells adding side wall or structure columns between stairway flight and rest platform,can significantly improve the natural vibration frequency of the stairs structure,reduce the vibration displacement of the staircase structure.Especially the method of adding side wall is applicable to a wider frequency range,which is a effective measure to improve the stair structure vibration resistance performance.