平底円筒形貯水タンクの地震時座屈挙動の検討 : 第2報,上部胴での非線形オーバル振動現象(機械力学,計測,自動制御)

概要

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When a thin walled cylindrical liquid storage tank is exposed to a very large seismic base excitation, buckling phenomena such as elephant foot bulge at the bottom portion and nonlinear ovaling vibration at the upper portion may be caused. In the 1st report, elephant foot bulge phenomena and the liquid pressure effect were investigated. In this report, nonlinear ovaling vibration phenomena were investigated based on the dynamic buckling tests and the external pressure buckling analysis by FEM, using scale models of thin cylindrical liquid storage tanks for the nuclear power plants. The mechanism and the effects of vertical excitation and liquid sloshing were studied and discussed. As a result, it was found that the negative pressure will dominate the occurrence of the nonlinear ovaling vibration and the effects of sloshing and vertical excitation are relatively small. Moreover it was thought that the nonlinear ovaling vibration observed here is buckling phenomenon due to the external liquid pressure.
2004-07-25