This study presents an effective solution to evaluate the dynamic impedances of scoured monopiles for offshore wind turbines in a wide excitation frequency range, which can properly account for both the effects of the scour-hole dimensions as well as of the soil stress histories, and the evaluation of these complex-valued impedance functions can be later used to take into account the soil-structure interaction in efficiently performing dynamic/seismic analyses of the scour-affected offshore wind turbines through substructuring techniques. Based on the common soil-pile configurations encountered in offshore practice, a series of parametric analyses are performed by using the presented solution to examine the dynamic impedance of scoured monopiles through varying scour-hole dimensions. The results show that the effects of scour-hole dimensions do not sensibly modify the overall trends of the impedance, but they do reduce the oscillation amplitudes and resonant frequencies or quantities of the impedance when compared with those before scour in the frequency range of practical interest; the scour depth has a significant impact on the monopile's impedance at most frequencies, while the effects of the width and slope angle of the scour hole should not be negligible in certain frequency ranges.

这项研究提出了一种有效的解决方案，用于评估宽激励频率范围内海上风力涡轮机的冲刷单桩的动态阻抗，该阻抗可以适当地考虑冲刷孔尺寸以及土壤应力历程的影响，以及这些复数值阻抗函数的评估可随后用于通过子结构技术有效地对受冲刷影响的海上风力涡轮机进行动力/地震分析时，考虑土壤与结构之间的相互作用。基于海上作业中常见的土桩配置，通过使用提出的解决方案通过变化的冲孔尺寸检查冲刷的单桩的动态阻抗，进行了一系列参数分析。结果表明，冲孔尺寸的影响不会明显改变阻抗的总体趋势，但是与实际实用的频率范围内的冲蚀之前相比，冲蚀孔尺寸的影响确实减小了振荡幅度和谐振频率或阻抗量。 ; 在大多数频率下，冲刷深度都会对单桩的阻抗产生重大影响，而冲刷孔的宽度和倾斜角度的影响在某些频率范围内不应忽略不计。