#6906. Analysis of a monopile under two-way cyclic loading

December 2026publication date
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Journal’s subject area:
Building and Construction;
Civil and Structural Engineering;
Geotechnical Engineering and Engineering Geology;
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Abstract:
Large diameter monopiles are commonly used as offshore wind turbine (OWT) foundations to withstand lateral cyclic loads due to wind and wave action. In the present study, a two-dimensional finite element analysis was performed to evaluate the behavior of a monopile under two-way lateral cyclic loading. The centrifuge test carried out on a 0.7m diameter pile was being used to validate the constituent model. The parametric study was carried out on a monopile by varying the slenderness ratio (L/D = 4, 5, and 6) and load amplitudes (30%, 40%, and 50% of the ultimate pile capacity). From the load-displacement response of a monopile, it was observed that the measured accumulated displacement increases drastically for the first load cycle. For a given embedded length, the lateral displacement was observed to increase with an increase in load amplitude. For an embedded length of L/D = 4, the increase in load amplitude from 30% - 40% resulted in an increase in lateral displacement to 24%.
Keywords:
Embedded length; Load amplitude; Monopile; Offshore wind turbine; Plaxis 2D

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