Lateral bearing capacity of hybrid monopile-friction wheel foundation for offshore wind turbines by centrifuge modelling

OCEAN ENGINEERING

卷:148

Article

Wang, Xuefei¹  Zeng, Xiangwu¹  Li, Jiale¹  Yang, Xu¹ 

[1] Case Western Reserve Univ, Dept Civil Engn, Cleveland, OH 44106 USA

关键词: Centrifuge modeling;    Hybrid monopile-friction wheel foundation;    Lateral capacity;    Offshore wind turbine;    Sandy soil;   

DOI  :  10.1016/j.oceaneng.2017.11.036

来源: Elsevier

【 摘 要 】

The hybrid monopile-friction wheel foundation is an innovative alternative for offshore wind turbines. The concept has wider adaptability and can be used as reinforcement method for existing monopiles. A series of centrifuge tests was performed to investigate the lateral bearing capacities of the hybrid foundation under monotonic loads. Five foundation models and two soil types were considered. According to the recorded responses, the hybrid foundation demonstrated better lateral behaviors that both lateral bearing capacity and stiffness are enhanced. Two analytical methods were proposed and compared with the centrifuge test results. The bearing capacity of the hybrid foundation is smaller than the sum of individual pile and friction wheel, and a reduction factor is suggested for both friction wheels. The friction wheel restrains rotations of monopile and provides extra restoring moments; their effects are idealized as equivalent moments acting on the pile head. The analytical results provide possible solutions in estimating the lateral bearing capacity of the innovative hybrid foundation system for offshore wind turbines by using traditional theories.

【 授权许可】

Free