大型地下厂房结构振动反应分析  

Vibration response of large underground powerhouse

作　　者：幸享林[1] 陈建康[1] 廖成刚[2] 张宏战[3] 

机构地区：[1]四川大学水利水电学院,成都610065 [2]中国水电顾问集团成都勘测设计研究院,成都610072 [3]大连理工大学,大连116024

出　　处：《振动与冲击》2013年第9期21-27,45,共8页Journal of Vibration and Shock

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.

关 键 词：动力分析 水电站厂房 振动 脉动压力 评价 

分 类 号：TU311.3[建筑科学—结构工程]