Design of large-scale prestressing bucket foundation for offshore wind turbines |
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| Authors: | LIAN Jijian DING Hongyan ZHANG Puyang YU Rui |
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| Institution: | 1 (1. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin 300072, China; 3. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China) |
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| Abstract: | The key in the force transmission between the tower and the foundation for offshore wind turbines is to transfer the large
moment and horizontal loads. The finite element model of a large-scale prestressing bucket foundation for offshore wind turbines
is set up and the structural characteristics of the arc transition structure of the foundation are analyzed for 40–60 channels
(20–30 rows) arranged with prestressing steel strand under the same ultimate load and boundary conditions. The mechanical
characteristics of the key parts of the foundation structures are illustrated by the peak of the principal tensile stress,
the peak of the principal compressive stress and the distribution areas where the principal tensile stress is larger than
2.00 MPa. It can be concluded that the maximum principal tensile stress of the arc transition decreases with the increasing
number of channels, and the amplitude does not change significantly; the maximum principal compressive stress increases with
the increasing number of channels and the amplitude changes significantly; however, for the distribution areas where the principal
tensile stress is larger than 2.00 MPa, with different channel numbers, the phenomenon is not obvious. Furthermore, the principal
tensile stress at the top of the foundation beams fluctuantly increases with the increasing number of channels and for the
top cover of the bucket, the principal tensile stress decreases with the increasing number of channels. |
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| Keywords: | offshore wind power large-scale prestressing bucket foundation arc transition structural design |
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