Study of Seismic Isolated Rigid Tank
|Keywords:||隔震;摩擦單擺支承;儲存槽;seismic isolation;friction pendulum bearing;storage;tank|
In this thesis, the feasibility of using the friction pendulum systems for seismic isolation of storage tanks is investigated. The dynamic problems of seismically isolated storage tanks involve theories of fluid mechanics and structural dynamics. In this study, the hydrodynamics of rigid storage tanks is first derived based on theories of fluid mechanics and the hybrid structural-hydrodynamics of rigid tanks with seismic isolation is further developed in conjunction with the principles of structural dynamics. With the analytical model developed, the effectiveness of the friction pendulum systems is assessed and rigorous parametric studies have also been carried out for design purposes. Finally, a comparative design example of both the friction pendulum systems and the lead-rubber bearings for earthquake-resistant design of a storage tank has been presented to demonstrate the design process for such applications. Analytical results indicate that the friction pendulum systems can effectively suppress the seismic responses of the tanks and the performance of the isolation system with respect to different system parameters can be accurately predicted. In addition, the weight-varying characteristics of storage tanks make the friction pendulum systems more favorable than the lead rubber bearings since the dynamic characteristic of an isolated tank is invariable regardless of its weight if implemented with FPS. Keywords：seismic isolation, friction pendulum bearing,storage, tank, .
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