Influence of a boatlanding and j-tubes on wave loads and wall thickness of the monopile support structure design

Influence of a boatlanding and j-tubes on wave loads and wall thickness of the monopile support structure design

Segeren, M.L.A.

Civil Engineering and Geosciences

Hydraulic Engineering

2011-11-28

Support structures for offshore wind turbines play a significant part in the cost of offshore wind energy. With current access systems a conventional boat landing is not necessary. Secondary steel, such as a boat landing and J-tube, influences wave loads. A way of taking the secondary steel items into account in the wave load calculation is through modifying the hydrodynamic coefficients. Wave loads are calculated using four design standards and the design of the monopiles of the Prinses Amalia Wind Farm. The wave loads results with and without secondary steel items can be used for a buckling check at the mudline for the specific case. This gives insight in the influence of the secondary steel items on wave load and wall thickness. Determining the drag coefficient using different standards will result in differences of the drag coefficient between 18% and 22%. A boat landing and j-tube will result in a wall thickness increase of 8-12% at the mud line location of the monopile pile design of the case study. This result can be used for considerations in the design of future support structures for offshore wind turbines.

support structure
monopile
design limitatio
steel reduction
secondary steel
appurtenances

http://resolver.tudelft.nl/uuid:409097f5-8389-4d7c-9f69-e24816648264

European Wind Energy Association

Proceedings of the EWEA Offshore 2011 Conference, Amsterdam, The Netherlands, 29 November-1 December 2011

Institutional Repository

conference paper

(c) 2011 Segeren, M.L.A.