ABSTRACT
As the market for renewable energy continues to expand, expectations for offshore wind power are growing. Monopiles, the most common type of offshore wind turbines foundation, are subjected to cyclic lateral loading due to wind and ocean waves during their service life. Therefore, it is desirable to accurately understand the cyclic loading characteristics of monopiles for design purposes. In this paper, we attempted to understand the difference in cyclic loading behavior of a monopile on sandy and clayey grounds through both model experiments and finite element analysis. As a result, it was confirmed that the lateral displacement of the sandy ground was gradually suppressed by the densification in front of the pile during cyclic loading. On the other hand, the clayey grounds showed rapid increase of displacement if the soil was disturbed by large cyclic loading.
