326 フォルソンダム・テンタゲートの動的不安定性とその崩壊の解析

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This paper presents the dynamic instability and failure analysis of Folsom Tainter-gate in California, which induced a flow-induced coupled-mode self-excited vibration and failed in 1995. The flow-induced vibration was theoretically analyzed and verified by model gate tests and by field tests of full-scale gates in Japan. The verified theoretical analysis was applied to the failed Folsom gate, thus revealing its dynamic instability. Furthermore, it was carefully analyzed that the essential dynamic instability would have been usually suppressed by Coulomb frictional effects, and such a friction-maintained dynamic stability would have been surely broken by an initial displacement trigger to induce a violent vibration. Moreover, the resultant hydrodynamic force acting on the skinplate was carefully calculated. As a result, with the aid of FEM simulations, the minimum streamwise vibration of the skinplate bottom end, causing fatal failure of the gate, was calculated. Finally, a scenario of the Folsom gate failure was summarized.
2002-09-13