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.

我们的研究旨在找到一种简化的计算方法，用于地震荷载作用下的冰-结构-水动力相互作用，以用于海上结构的抗震设计。在我们提出的方法中，以具有一定刚度和阻尼的弹簧形式建模的冰在固结点约束了结构，并且在地震作用下海冰以附加质量的形式振动。流体动力压力对结构的影响基于改进的莫里森流体动力压力理论。然后，为了确定我们提出的方法的误差，我们进行了地震模拟的振动台实验，并根据相似性定律设计了等效的海冰材料，发现我们提出的方法的计算与各自的计算结果吻合良好。实验数据。最后，我们研究了海冰对高架桩结构抗震设计参数的影响，结果表明，内力在海冰作用位置处迅速增大，并且结构顶面的位移和加速度对高地震响应更加敏感。地震波的频率分量；海冰不仅降低了能量耗散能力，而且改变了结构上水动力压力的作用方式。