Project description and goal:
Today large diameter monopiles are the most common foundation used at large offshore wind farms. Traditionally, the design of laterally loaded piles is based on a Winkler model approach formulating the soil response as nonlinear springs based on e.g. APS standard. Based on recent finite element calculations, it has been assessed that the capacity and stiffness of large diameter piles (D = 5-8 m) may be overestimated using the standard methods. Current offshore wind design methods have matured to a 1st generation state. It is now timely to investigate the possibilities of improving existing methods. So in the light of the large number of offshore wind turbined planned to be installed on large diameter monopiles based on presumingly unconservative assumtions, it is of great imortance to investigate such effects.
Based on measurements from the pilot projects Horns Rev and Burbo, this project has the unique possibility to test in full-scale large pile-soil interaction. By combining these full-scale measurements with state-of-the-art 3D finite element calculations and centrifuge tests, the present project will aim at establishing a conceptual model for large pile-soil interaction including degradation effects. The objective is to identify the most important uncertainty drives concerning soil-pile interaction, reduce the uncertainties and improve the design procedure. The aim is to rewrite the foundation module in the aeroelastic codes HAWC and FLEX so it will be able to simulate the proper elasto-plastic response of large diameter piles.
|Effektiv start/slut dato||01/01/2007 → 31/12/2009|
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