Author(s): Yu Tan; Yang Dai; Jiesheng Min

Linked Author(s):

Keywords: Offshore wind power; Dynamic wave response; Wave spectral fatigue; Pile-soil interaction; Finite element analysis

Abstract: Towards a more efficient wave spectral fatigue workflow based on the finite element method (FEM), this paper proposes a frequency-domain and mesh-independent dynamic response analysis method considering the non-linear pile-soil interaction effect, which is implemented in the open-source FEM solver Code_Aster. The main idea is to decouple the superstructure and pile. For the superstructure, frequency-domain harmonic analysis is adopted with the foundation condensed into macro-element. The non-linear wave load is precisely integrated on fictitious integration points and converted to nodal loads to decorrelate the stress response with the mesh density. For the pile, stress response is determined by one-way coupled quasi-static analysis using a reduced pile model. The method is applied to real industrial cases aiming at assessing the fatigue damage of monopile and jacket wind turbine foundations in South China Sea. The results showed that the proposed method outperforms the traditional approaches in terms of time-efficiency while maintaining equivalent accuracy compared to the commercial software based on the finite difference method (FDM). Cloud-based simulation software was developed to provide a convenient, interactive and shared tool for offshore structure design.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1686-cd

Year: 2025