Offshore support structures with suction buckets: Parameter fitting of a simplified foundation model

In this work the representation of an offshore support structure is fitted in terms of a simplified foundation model. Therefore, measurement data coming from the first jacket prototype of an offshore wind turbine with suction bucket foundation are taken as a reference for the adjustment of the proposed foundation model. The measurements are processed with an output-only technique, the Frequency Domain Decomposition. By assuming that uncertainties are located in the foundation modeling, the properties are varied to find a set of parameters that minimize the residual errors for the modal frequencies and modal shapes regarding the measurement data.