Studies on the seismic buckling design guideline of FBR primary coolant systems (2nd report, analytical studies on subharmonic vibration of clamped-free thin cylindrical shells immersed in fluid under horizontal excitation)

摘要

When a thin cylindrical shell immersed in fluid is subjected to sinusoidal wave excitations in the horizontal direction, subbarmonic vibration accompanying shell mode vibration may occur depending on the excitation condition. This phenomenon wasinvestigated by dynamic stability analysis and was proved to be dependent both on frequency and acceleration amplitude of excitation. Calculation results under sinusoidal wave excitation and comparison of dynamic pressure when subharmonic vibration occurs with elastic buckling pressure provide a criterion for assessing stability of subbarmonic vibration under seismic wave excitation.