Long-term horizontal cyclic loading model test results of monopile for offshore wind turbines
Long-term horizontal cyclic loading model test results of monopile for offshore wind turbines
In this study, a 1? model monopile test was conducted under long-term horizontal cyclic loading. The focus of the study is to understand the effect of the number of cycles on the response of the monopile which is mainly used for large 8 − 9 ?? offshore wind turbines OWTs. The monopile was tested in a saturated very dense sand and subjected to a sinusoidal cyclic horizontal load ?. The ? is approximately 3.5% of the ultimate load capacity ??. Unidirectional one-way cyclic loading ? = 2,000 with a loading frequency of ? = 0.2 ?? was applied considering the typical frequency range for OWTs. The head of the model pile was equipped with the transducers to obtain the lateral pile head displacement, pile head rotation, and the lateral stiffness evaluation during cyclic loading. The results show that the pile head displacement and rotation accumulation continue to increase with the increase of the number of cycles. In particular, the displacement accumulation during the first few load cycles is clearly larger than the subsequent displacement accumulation. Besides, the lateral secant stiffness ?? decreases with increasing number of loading cycles. The test results indicate that pile head displacement, head rotation, and the lateral stiffness are considerably affected by the number of load cycles.
C. T. Akdag; F. Rackwitz
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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