Jyoti Ranjan Barik, Kishore Chandra Biswal

Abstract:

The present numerical exploration involves the assessment of the dynamic responses of a partially filled rectangular fluid container decoupled by nonlinear hysteretic bearings. The computational domain exhibits a bottom mounted submerged vertical baffle and is simulated using Galerkin's finite element method based on the velocity potential. The developed model's accuracy is authenticated by comparing with the existing results. The time domain analysis involves a long-duration irregular harmonic motion subjected to the system. The findings suggest that the isolation system is remarkably effective across various tank-fluid-baffle setups and efficiently controls key dynamic responses in the fluid tank, including hydrodynamic base shear and sloshing amplitudes. The investigation also evaluates the peak hydrodynamic responses in tanks with and without base isolation, considering different heights and widths of the submerged baffle. It has been found that changes in the h/d ratio have a more significant impact on sloshing amplitude and base shear responses than changes in the w/L ratio. The implementation of base isolation leads to a reduction in sloshing amplitudes ranging from 12% to 34% across different baffle configurations, with the exception being at h/d=0.5. Additionally, base shear is reduced by 2% to 48% in tanks with base isolation, depending on the specific baffle configurations. Notably, the maximum isolator displacement consistently occurs at h/d=0.5, regardless of the baffle width.

Keywords: Nonlinear hysteretic bearings, Galerkin’s finite element method, submerged baffle, long-duration irregular harmonic motion.

Date Published: May 31, 2024
DOI: 10.11159/ijci.2024.003

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