水电站地面厂房鞭梢效应及抗震分析

Whiplash Effect of Ground Hydropower House and Its Aseismic Analysis

以某水电站地面厂房为例,研究了厂房上部结构在地震中的鞭梢效应,探讨了鞭梢效应的成因和机理,根据水电站厂房的几何构造、受力特点和动力特性建立了整体和局部模型,并采用时程分析法对比分析了不同模型在地震中的动力响应。结果表明,从基础传来的地震波经厂房下部结构放大后,对上部结构的地震反应影响显著,而上部结构的鞭梢效应也对下部结构的地震响应有一定的影响。

Taking the power house of ground hydropower station for an example, the whiplash effect of superstructure of power house in the earthquake is researched in this paper. The cause and mechanism of the whiplash effect are studied. The integrated model and partial model are established on the basis of geometric construction, mechanical and dynamic characteristics of the power house. The seismic responses of different models in the earthquake are compared by using time-history analysis. The results show that the seismic wave propagated from foundation and amplified by the substructure has significant effect on seismic responses of the superstructure; the whiplash effect of superstructure has a certain impact on seismic responses of substructure.