Abstract
The pile–bucket foundation that features a bucket slipped onto a monopile is a new type of symmetric offshore foundation supporting the wind turbine. Its load bearing and deformation resistance capacity are unclear, especially when subjected to cyclic horizontal loadings. In this paper, a model test has been designed and carried out for investigating the cyclic behavior of the pile–bucket foundation embedded in soft marine clay. Cyclic horizontal loads are applied in a displacement-controlled manner with different amplitudes and frequencies. The influences of cyclic loading parameters, including the amplitude, the frequency and the cycle number, have been studied from the perspectives of stiffness-degradation and damping effect that are evaluated from the recorded horizontal force–displacement relationships at the loading point. In addition, the influences of cyclic horizontal loading on the bending moment distribution and on the p–y curve have been presented and discussed. The results show that significant reductions in the foundation stiffness and in the soil resistance may be observed during the first few cycles when the loading displacement is relatively high.
Highlights
Introduction and Sergei DOdintsovAs a clean and renewable energy source, offshore wind energy has been attracting more and more attention all over the world
Amodel test is designed and performed in this paper to investigate the cyclic horizontal load-bearing and deformation-resistance characteristics of the symmetric pile–bucket foundation embedded in soft marine clay
Three test cases have been conducted on the model foundation, i.e., the monotonic loading case and the cyclic horizontal-displacement loading cases either with stepped increasing amplitudes or with stepped increasing frequencies
Summary
Introduction and Sergei DOdintsovAs a clean and renewable energy source, offshore wind energy has been attracting more and more attention all over the world. To ensure the working conditions of the wind turbine, stringent requirements surrounding the cumulative deformation of the foundation should be met. For monopiles in soft marine soil, there is a continuous need to improve the deformation resistance capacity even though monopiles of high rigidity (e.g., with diameter as large as 6~8 m) have been used in practice. To this aim, a new type of offshore foundation that combines the bucket and monopile, i.e., the so-called pile–. It is of vital importance to understand the load-bearing and deformation-resistance characteristics of this new foundation when it is subjected to horizontal wind/wave loads
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