Abstract
Natural hazards, such as earthquakes, flooding, hurricanes, and tornados, very often have devastating effects on civil structures, with the consequences of loss of human lives and negative economic impacts. The deepwater vibration-isolated foundation is a new bridge foundation that can prevent bridge damage due to large deformation under strong natural hazards because the laying of a specially designed gravel, sand and other materials between bridge foundation and subgrade can allow the foundation to slide and swing. Taking the main tower foundation of the Rion-Antirion bridge in Greece as an example of a deepwater vibration-isolated foundation structure, the a vibration-isolated numerical model which considers the influence of hydrodynamic pressure and hydrodynamic damping is established to study the seismic response characteristics of this structure to find the optimal vibration-isolated stiffness and damping. It is found that the structure mainly undergoes translational movements under the optimum stiffness and damping isolation conditions.
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