The response of pile foundations in sand to axial cyclic loading

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Global warming due to climate change is altering marine ecosystems and thus having a striking impact on
the worlds oceans. Technical solutions in offshore wind for future sustainable energy can contribute to alleviating this
situation. The high demand for renewable energy requires effective and accurate design methods. To develop representative
tools for cyclic loading analysis of offshore structures it is essential to understand the axial response of pile foundations
during vertical cyclic loading. This paper presents a series of centrifuge experiments that investigate the load-displacement
behaviour of piles in sand due to axial cyclic loading. Within the scope of research of the physical model tests is the impact
of the cyclic load ratio and the initial relative density on the evolution of pile movement. This includes the pile response due
to cyclic axial loading in tension and compression as well as the pile response in homogenous and layered soil, i.e. loose
over dense sand. Strain measurements with optic fibres along the length of the model pile supplement the recorded axial
load-displacement response. The results aim to improve the understanding of pile response to axial cyclic loading and give
further insights into the load-transfer mechanisms that take place.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

10 - Jacket pin piles design: capacity, long-term cyclic loading, seismic loads