水利水电技术（中英文）

针对渤海某3MW单桩式海上风电场进行了抗冰锥结构设计,并通过LS-DYNA软件对直立桩结构及加装的锥体结构冰荷载进行显式动力分析。通过分析冰排在直立桩和锥体结构前的破坏模式及破坏特点,获得冰力时程曲线及冰力值,将有限元分析结果与规范公式的计算结果进行对比分析。通过改变抗冰锥锥角,研究不同锥角情况下结构冰荷载的变化规律。结果表明,直立桩冰荷载数值分析结果与规范公式计算结果较为接近,锥体结构冰荷载数值分析结果与Ralston公式计算结果相差较小,冰荷载水平分量随锥角的增加而显著增大,而竖向分量则随之降低。显式动力分析结果可为单桩式海上风电结构抗冰锥冰荷载估算及锥体结构尺寸优化提供参考。

The anti-ice conical structure design is carried out for a 3 MW offshore wind farm with monopole foundation in the Bohai Sea, for which an explicit dynamic analysis is made on the ice load on the upright pile structure and its additionally installed conical structure. Through the analysis on the failure mode and characteristics of the failure of the ice raft in front of the upright pile and the conical structure, both the ice force-time history curve and value are obtained, and then the result from the relevant finite element analysis and the result from the relevant formula specified in the relevant specification are comparatively analyzed. Through changing the conical angle of the anti-ice conical structure, the changing law of the ice load on the structure under the conditions of various conical angles is studied. The result shows that the result of numerical analysis on the upright pile is more close to that from the calculation made by the formula specified in the relevant specification, while the difference between the numerical analysis result of the ice load on anti-ice conical structure and that from Ralston's theoretical formula is less and the horizontal component of the ice load is significantly increased along with the increase of the conical angle, but then the vertical component is decreased. The result of the explicit dynamic analysis can provide a reference for the estimation of the ice load on conical structure of monopile foundation for offshore wind farm and the optimization of the size of the conical structure.