高耸塔柱内部水体作用下顶部机房的鞭梢效应研究  

Research on Whiplash Effect of Engine Room along Water Level Changes

作　　者：刘德宇[1] 赵兰浩[1] 刘智[1] 

机构地区：[1]河海大学水利水电学院,南京210098

出　　处：《中国农村水利水电》2016年第7期142-144,148,共4页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(51279050)

摘　　要：以景洪水电站水力式升船机为例,研究升船机正常运行时竖井内水位变化对顶部机房鞭梢效应的影响。采用附加质量法模拟竖井内水体和黏弹性边界,运用时程分析法计算升船机塔柱和顶部机房不同工况下的位移和加速度响应,对比顶部机房在高低两种水位下的自振频率和地震响应。结果显示,当竖井充水至高水位时,结构自振频率下降5%～18%,但顶部机房特征点位移增加4.5%～68%,加速度增大23.2%～45%,因此,升船机顶部机房应加强抗震防护。Taking hydraulic floating ship lift of Jinghong Hydropower Station as the research project, this paper studies the whiplash effect of the engine room along the water level changes. Additional mass method is adopted to simulate the water effect in the tower column. Viscoelastic artificial boundary is adopted to simulate the effect of foundation radiation. Time-history analysis method is a- dopted to calculate the displacement and acceleration responses of the ship lift tower and engine room under different working condi- tions, earthquakes in three different directions, and compare the responses of the earthquake and natural frequency at different water levels. The results show that the natural frequency of the structure decreased by 5%-18%, while the displacement of the engine room increased by 4. 5%-68% and the acceleration increased by 23.2%-45%. Therefore, attention should be paid to controling the water level changes during the normal running of the ship lift.

关 键 词：水力式升船机 附加质量 地基辐射阻尼效应 鞭梢效应 

分 类 号：TV74[水利工程—水利水电工程]