Dynamic Analysis of Flexible Tank
|關鍵字:||柔性儲存槽;動水壓;衝擊液壓;液面激盪;flexible tank;dynamic pressure;impulsive pressure;sloshing displacement|
In this study, the equation of motion of flexible tanks under seismic load has been derived based on a simplified model, which allows for analyzing the dynamic characteristics of flexible tanks. A series of numerical simulations has been conducted to explore the difference of dynamic characteristics between flexible and rigid tanks via different earthquakes of various intensity levels. Simulation results indicate that the impulsive pressure for slender tanks increases due to the vibration of the tank shell, while the distribution of the dynamic pressure becomes closer to rigid tanks as the storage level lowered. The dynamic properties of broad tanks are similar to rigid tanks as reflected from the distribution of dynamic pressure. Moreover, the coupling effect of surface sloshing with the shell vibration is found negligible in the cases studied, which suggests the sloshing displacement may be estimated from the hydrodynamic analysis of rigid tanks.