Abstract
This paper elaborates on a new composite bucket foundation (CBF) structural system for offshore wind turbines. The proposed CBF consists of a special force transition section, a beam system structure upper steel bucket cover and a large-scale steel bucket with honeycomb structure rooms. It can be prefabricated onshore, self-floated on the sea and then towed to the appointed sea area before sinking to the sea soil under negative pressure. This is called the “one-step” installation technology. Arc- and line-type bucket foundations are calculated by both theory and the finite element method to discuss their force transfer paths and bearing modes. Owning to the special structural form, the transition section can effectively convert the huge load and bending moment into controllable tension and compressive stress, as well as adjust the structure balance. The bearing model and percentage of each part of the composite foundation under monotonous and ultimate load conditions are also calculated. Results indicate that the bearing mode of CBF is a typical top cover mode. In addition, the curvature impact of arc-type is studied and the results reveal that the structure type of the transition section is more important than the diameter ratio between the bottom transition section and the bucket.
Highlights
Offshore wind turbines are a new frontier in wind power development
Considering the mechanical properties, cost-effectiveness, and construction feasibility, the main forms of offshore wind turbine structures usually consist of concrete structures, such as elevated pile caps, monopile foundations, and gravity foundations
According to the upper transition section structure, two different foundations are used in the project: arc-type (Figure 2a) and line type (Figure 2b)
Summary
Offshore wind turbines are a new frontier in wind power development. Their foundations are significantly affected by the horizontal force and large bending moment at the top. Barari et al [3] proposed a new equation for calculating the horizontal and vertical bearing capacities They carried out an experiment of moment loading on small-scale (30 cm diameter) bucket foundation models installed on Yoldia clay, and presented the yield loci to describe the load combinations at failure in the horizontal, vertical, and moment loading coordinate system (H-V-M). 1041 paper, of 19up to a numerical 3D FEM based on engineering practices in China was set investigate the load transfer characteristics, bearing modes, and the contribution of each part of the horizontal load and structural bending moment, in actual designs, itloads must to find a reasonable structural form find acomposite reasonable form monotonous toand effectively transfer the seabedThe soil through foundation under and ultimate load conditions.
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