三峡水利枢纽左岸电站厂房抗震分析

采用三维有限元方法对三峡左岸电站厂房进行抗震计算研究，分别对一个机组段厂房整体结构和子结构进行动力特性计算，并与水力脉动、不平衡电磁力、机械力的频率进行了共振校核．按照相似关系将模型试验测得的流道中的脉动压力转换到原型，对结构在水力脉动压力作用下的振动响应进行瞬态动力分析．计算结果表明三峡左岸电站厂房结构的动位移和动应力都在安全范围内．

Seismic analysis of left underground powerhouse of Three Gorges Hydropower Station

Seismic study is made on the left underground powerhouse of Three Gorges Hydropower Station with 3-D FEM herein, in which the dynamic responses of the whole structure and its sub-structures are calculated respectively; while the structure resonance vibration is cheked by comparing the frequency of hydraulic fluctuation, disequilibrium electromagnetic force and mechanical force. Furthermore, the transient dynamic analysis is made on the seismic response of the structure under the effect of hydraulic fluctuation by converting the fluctuating pressure measured from the flow path of the model into the archetypic ones in accordance with the correlation relationship concerned. The result shows that both the dynamic displacement and the dynamic stress status of the powerhouse structure are within the safe margin.