Field Vibration Tests of Full-Scale Tainter-Gates and Verificaiton of Its Theoretical Analysis

斜闸门（径向闸门）常被用作大坝泄洪的顶闸。1995年7月17日清晨，安装在加州福尔索姆大坝上的一个巨大的泰恩特门引起了振动，并发生了故障。从事故发生后不久就指出了振动参与其失效的可能性，并进行了一些失效分析研究。本研究对实际使用的47吨全尺寸闸门进行了现场振动试验，确定了其在空气和水中的固有振动特性。利用冲击锤和加速度计对闸门进行了模态试验，从而确定了其在空气中的固有频率、模态振型和模态阻尼。随后进行了水内振动试验，揭示了闸门的振动特性。最后，将计算得到的水内固有振动频率与实测的水内自激振动频率进行比较，验证了全尺寸闸门理论分析的有效性

Tainter gates (radial gates) are frequently used as a crest gate of dam for a flood release. A huge Tainter gate installed on Folsom dam in Califrnia, induced vibrations and failed, early in the morning of July 17, 1995. Apossibility that vibration participated in its failure was pointed out from just after the accident, and some failure analysis studies have been performed by applicantsIn this study, field vibration tests were conducted on a 47-ton full-scale gate under practical uses, to determine its in-air and in-water natural vibration characteristics. Experimental modal tests, using an impact hammer and accelerometers, were conducted on the gate, thus addressing its in-air natural frequencies, mode shapes and modal damping. Subsequently, the in-water vibration tests were conducted to reveal the vibration characteristics of the gate. Conclusively, comparison of the calculated inherent in-water vibration frequency and the measured frequency of the in-water self-excited vibration confirms the validity of the theoretical analysis developed for full-scall gate