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<p>Tripod bucket foundations, supporting offshore wind turbines, are primarily subjected to combined horizontal-moment loading. In these foundations, the applied moment is distributed among the individual legs of the tripod through a push–pull mechanism. Based on this concept, the moment capacity of a tripod foundation can be inferred from the vertical uplift capacity of a single bucket foundation. This study presents 1&#xa0;g physical model tests on single bucket foundations embedded in overconsolidated clay to evaluate the effect of cyclic loading on subsequent monotonic uplift capacity. Tests conducted across three separate clay beds demonstrated a marked decrease in post-cyclic monotonic uplift capacities with increasing numbers of displacement cycles. Stiffness during cyclic loading reduces rapidly in the initial few cycles and then stabilizes. However, the post-cyclic uplift capacity is influenced by the total number of loading cycles. Additionally, two supplementary tests were carried out on a conjoined foundation system (comprising two interconnected buckets) to examine the influence of bucket interaction on uplift resistance. The results indicate that the interaction between buckets has a negligible effect on the uplift capacity of the conjoined foundation.</p>

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Undrained Vertical Uplift Capacity of Bucket Foundations in Overconsolidated Clay under Two Way Cyclic Loading

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Naresh Kumar Singam,
  • Santiram Chatterjee

摘要

Tripod bucket foundations, supporting offshore wind turbines, are primarily subjected to combined horizontal-moment loading. In these foundations, the applied moment is distributed among the individual legs of the tripod through a push–pull mechanism. Based on this concept, the moment capacity of a tripod foundation can be inferred from the vertical uplift capacity of a single bucket foundation. This study presents 1 g physical model tests on single bucket foundations embedded in overconsolidated clay to evaluate the effect of cyclic loading on subsequent monotonic uplift capacity. Tests conducted across three separate clay beds demonstrated a marked decrease in post-cyclic monotonic uplift capacities with increasing numbers of displacement cycles. Stiffness during cyclic loading reduces rapidly in the initial few cycles and then stabilizes. However, the post-cyclic uplift capacity is influenced by the total number of loading cycles. Additionally, two supplementary tests were carried out on a conjoined foundation system (comprising two interconnected buckets) to examine the influence of bucket interaction on uplift resistance. The results indicate that the interaction between buckets has a negligible effect on the uplift capacity of the conjoined foundation.