Huang Shuai, Qi Qingjie, Zhai Shufeng, Liu Wengang, Liu Jianzhong
National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, 100085, China.
China Coal Research Institute, Beijing, 100013, China.
Sci Rep. 2021 Mar 24;11(1):6714. doi: 10.1038/s41598-021-86142-0.
Ice-structure interaction threatens the safety of the offshore structure; however, dynamic seismic action even renders this process more sophisticated. This research constructed a simplified calculation model for the wind turbine tower, ice, and water under seismic loading, which could avoid solving the complex non-linear equations. Then, the seismic behaviour of the structure, i.e. wind turbine tower, in the presence and absence of influences of the sea ice was investigated, and we found the remarkable effect of sea ice upon the wind turbine tower when its mass is within a range; the wind turbine tower is found to have reduced capacity in energy dissipation, and thickness of tower walls or stiffening ribs is supposed to be enlarged for making the structure more ductile. Affected by the sea ice, the shear force and bending moment of the tower showed significant increases, and more attention needs to be paid to the tower bottom and action position of the sea ice. According to the dynamic similarity principle, finally paraffin was used to simulate sea ice, and shaking-table tests were performed for simulating dynamic ice-structure-water interactions. Results of shaking-table tests verified the rationality of our proposed simplified model.
冰-结构相互作用威胁着海上结构物的安全；然而，动态地震作用甚至使这一过程更加复杂。本研究构建了地震作用下风力发电机组塔筒、冰和水的简化计算模型，该模型可避免求解复杂的非线性方程。然后，研究了有无海冰影响时结构（即风力发电机组塔筒）的抗震性能，发现当海冰质量在一定范围内时，海冰对风力发电机组塔筒有显著影响；风力发电机组塔筒的能量耗散能力降低，应增大塔筒壁或加劲肋的厚度以使结构更具延性。受海冰影响，塔筒的剪力和弯矩显著增加，需要更多关注塔筒底部和海冰的作用位置。根据动力相似原理，最后采用石蜡模拟海冰，并进行振动台试验以模拟动态冰-结构-水相互作用。振动台试验结果验证了所提简化模型的合理性。
