AUTHOR=Wang Bin , Liu Yingzhou , Zhang Jianhua , Shi Wei , Li Xin , Li Ying 

TITLE=Dynamic analysis of offshore wind turbines subjected to the combined wind and ice loads based on the cohesive element method

JOURNAL=Frontiers in Marine Science

VOLUME=Volume 9 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2022.956032

DOI=10.3389/fmars.2022.956032

ISSN=2296-7745

ABSTRACT=Ice loads are an important and decisive factor for the safe operation of offshore wind turbines (OWT). In severe load cases, it shall lead to prominent ice-induced vibration and ice-induced fatigue failure of OWT structures. Based on the cohesive element method (CEM) and considering the pile-soil interaction used by nonlinear distributed springs, the fully interaction model of the ice and monopile OWT structure with ice-breaking cone in a cold sea region is established in this study. Furthermore, the Tsai-Wu yield criterion and the empirical failure formula used to describe the mechanical behavior of ice bending failure are combined into collision simulation tool LS-DYNA, and the dynamic ice loads under different ice velocities and cone angles are statistically analyzed. Finally, according to the interaction process between sea ice and OWT containing ice-breaking cone, the dynamic response of OWT under the combined wind and ice loads is studied, and the most reasonable ice-breaking cone angle is determined. The results show that the method adopted in this paper can well simulate the bending failure process of sea ice. Concurrently, the cone angle has a significant impact on the dynamic response and damage of the OWT, and the recommended optimal cone angle is 60 degree.