Application of DSI techniques to monopile foundations of offshore wind turbines reliability problems   Zhang Jing, Yugang Li, Haigui Kang School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, China
			ABSTRACT

The monopile foundations of offshore wind turbines are subject to combined wind and wave loading which must be taken into account for the reliability problems. The pile-soil structure system is complicated and the performance functions of piles under inclined loads are implicit For failure probability estimates of the monopile foundations, the numerical expensive evaluations of the limit state function have to be replaced by suitable approximations. The common approach is to use the response surface method (RSM) based on the least square regression. However, the application of the discrete smooth interpolation (DSI) techniques to structural reliability problems has not been realized until recently. This paper investigates the use of DSI techniques that can be used to construct response surface approximation. Example is given in the paper by comparing with the most common RSM and the result shows that this method is compared well with those obtained by the RSM and is applicable to offshore wind turbines foundation reliability analysis involving implicit performance functions such as monopile foundations.

Keywords: Offshore wind turbines; Monopile foundations; Response surface method; Reliability; Discrete Smooth Interpolation

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