Derivation of equivalent number of cycles in the design of cyclically loaded offshore foundations
Derivation of equivalent number of cycles in the design of cyclically loaded offshore foundations
Especially during storm events, excess pore pressure can build up in the soil around cyclically loaded offshore foundations. Such accumulated excess pore pressure reduces the effective stresses in the soil and thus has a negative impact on structural integrity. In this work, a practical approach is presented to apply the soil behaviour determined in cyclic direct simple shear tests to the bearing capacity of the foundation structure using a three-dimensional numerical model. In practical designs, not a single load package with a constant number of equivalent cycles is given, but a design storm with different storm bins. The presented numerical approach is complemented by a procedure to derive an equivalent number of cycles from predefined load parcels. The soil response is accounted for by a contour approach that allows the use of site-specific cyclic direct simple shear test results by considering the mean stress, the cyclic shear stress amplitude and the number of load cycles at each integration point of the numerical model under partially drained conditions.
J. E. Saathoff; M. Achmus
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
12. Offshore geotechnics
https://doi.org/10.53243/NUMGE2023-173
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