Liquefaction response of monopile-supported offshore wind structures

Overview

This presentation will address the earthquake response of offshore wind structures with focus on response of monopile-supported wind turbines in liquefiable soil. The use of SaniSand constitutive model implemented in Flac3D is presented by verification of the model against centrifuge test data.

The model is then used to perform a series of dynamic analyses to highlight the main characteristics of the response. Different combinations of lateral environmental loads together with earthquake shaking are presented.

By comparing the results with the case of no environmental loads, it is shown how the permanent tilt induced by the earthquake is affected by the concurrent environmental loads. Application of the model in large subsea structures which are affected only by earthquake shaking and liquefaction is also demonstrated.