A simplified calculation method of ice-structure-water dynamic interaction under earthquake action

2021 
Abstract Our study aims to find a simplified calculation method of ice–structure–water​ dynamic interaction under seismic load to be used in seismic design of offshore structure. In our proposed method, the ice, modelled in the form of a spring with certain stiffness and damping, constrains the structure at the point of consolidation, and sea ice vibrates with the structure in the form of additional mass under the earthquake action; the influence of hydrodynamic pressure on the structure is based on improved Morison’s hydrodynamic pressure theory. Then, to determine the error of our proposed method, we carried out a shaking table experiment for seismic simulating, and designed an equivalent material for sea ice based on similarity law, and we found that the calculations of our proposed method agree well with the respective experimental data. Finally, we investigated the influence of sea ice on seismic design parameters of an elevated pile structure, and the results show that the internal force increases rapidly at the action position of sea ice, and the displacement and acceleration of the structure top are more sensitive to the high-frequency components of the seismic wave; the sea ice not only decreases the energy dissipation capacity, but also changes the action mode of hydrodynamic pressure on the structure.
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