beat vibration of ertan arch dam under ambient excitation
Lian Ji-jian1, Li Cheng-ye1, Liu Fang1, Song Ming-fu2
Author information+
1. School of Civil Engineering，Tianjin University，Tianjin 300072，China;2. Ertan Hydro-Electric Power Station，Pan Zhihua 617000，China
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History+
Received
Revised
Published
2010-10-14
2010-12-14
2012-02-15
Issue Date
2012-02-15
Abstract
Researching on the vibration time interval curve of Ertan arch dam under flood discharge excitation, we can see the phenomenon that the wave envelope increases or reduces along with the time. Firstly, the effects caused by initial phase difference, frequency ratio and amplitude ratio have been discussed. Secondly, dominant frequency of measured data has been collated and analyzed with the Auto Regressive Modal, obtaining the first four vibration mode based on SSI. Lastly, combined with special features of beat vibrations itself, beat vibrations of Ertan arch dam under discharge flow has been researched. The result shows that the main cause forming beat vibration is the former two orders vibration mode whose frequency is similar. In addition, a vibration component whose frequency band is during 1.27~1.39Hz also gives rise to forming “beat”. The component is considered at present that it is caused by nonlinear contact between dam sections.
Lian Ji-jian;Li Cheng-ye;Liu Fang;Song Ming-fu.
beat vibration of ertan arch dam under ambient excitation[J]. Journal of Vibration and Shock, 2012, 31(3): 1-7
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