摘要
建立锦屏一级水电站地下厂房结构三维有限元动力分析模型,计算结构自振特性,并复核结构共振。通过模型水力脉动试验,获得锦屏一级水电站流道脉动压力荷载特性,用动力法分析厂房结构在机组振动荷载与水力脉动荷载作用下的振动反应,并据国内外有关规程规范对振动反应进行评价。研究结果表明,地下厂房结构与各种振源频率相差较大,不存在共振的可能性。地下厂房结构整体刚度较大,在机组振动荷载及水力脉动荷载作用下,振动位移、应力、速度均较小,满足有关规程要求。
Characteristics of natural vibration and possible resonance of the underground powerhouse in Jinping I hydropower station were modelled and analysed with 3D dynamic finite elements. Based on the hydraulic pulse test on the model, the characteristics of fluctuating pressure loads on Jinping I hydropower were obtained. The vibration responses of powerhouse structure, under the unit vibration loads and the pulsating loads respectively, were analysed dynamically and evaluated according to related codes and specifications at home and abroad. The results show that the natural frequencies of the underground structures are very different from those of the ambient vibration sources, so the resonance is of no way to happen. Meanwhile, due to that the total stiffness of the underground powerhouse structure is rather large, the vibration displacement, stress and velocity under the unit vibration loads and the pulsating loads are small respectively and can meet the requirement of related codes and specifications.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第9期21-27,45,共8页
Journal of Vibration and Shock
关键词
动力分析
水电站厂房
振动
脉动压力
评价
Dynamic analysis
Hydroelectric power
Specifications
Underground structures
