Effect of Reinforced Bucket on Bearing Capacity and Natural Frequency of Offshore Wind Turbines Using Pile–Bucket Foundation

Table 11

The fundamental frequencies for different foundations solving by the FEM-analysis combined method.

Type of foundation	The monopile foundation, d = 4 m	The pile-bucket foundation, D = 16 m and H = 4 m	The pile-bucket foundation, D = 16 m and H = 8 m	The pile-bucket foundation, D = 16 m and H = 12 m	The pile-bucket foundation, D = 20 m and H = 8 m	The pile-bucket foundation, D = 12 m and H = 8 m
The predicted value by the FEM-analysis combined method (Hz)	0.359	0.368	0.369	0.369	0.370	0.368