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Dynamic Response of Offshore Open-Ended Pile under Lateral Cyclic Loadings
Open AccessArticle

Dynamic Impedances of Offshore Rock-Socketed Monopiles

by Rui He 1,2,*, Ji Ji 1,2, Jisheng Zhang 1,2, Wei Peng 1,2, Zufeng Sun 3 and Zhen Guo 4
1
Key Laboratory of Coastal Disaster and Defense (Hohai University), Ministry of Education, Nanjing 210017, China
2
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China
3
Hangzhou Qiantang Electrical Engineering CO., Ltd., Hangzhou 310020, China
4
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(5), 134; https://doi.org/10.3390/jmse7050134
Received: 1 March 2019 / Revised: 30 April 2019 / Accepted: 2 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Coastal Geohazard and Offshore Geotechnics)
With the development of offshore wind energy in China, more and more offshore wind turbines are being constructed in rock-based sea areas. However, the large diameter and thin-walled steel rock-socketed monopiles are very scarce at present, and both the construction and design are very difficult. For the design, the dynamic safety during the whole lifetime of the wind turbine is difficult to guarantee. Dynamic safety of a turbine is mostly controlled by the dynamic impedances of the rock-socketed monopile, which are still not well understood. How to choose the appropriate impedances of the socketed monopiles so that the wind turbines will neither resonant nor be too conservative is the main problem. Based on a numerical model in this study, the accurate impedances are obtained for different frequencies of excitation, different soil and rock parameters, and different rock-socketed lengths. The dynamic stiffness of monopile increases, while the radiative damping decreases as rock-socketed depth increases. When the weathering degree of rock increases, the dynamic stiffness of the monopile decreases, while the radiative damping increases. View Full-Text
Keywords: rock-socketed piles; monopiles; impedances; dynamic responses; offshore wind turbines rock-socketed piles; monopiles; impedances; dynamic responses; offshore wind turbines
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MDPI and ACS Style

He, R.; Ji, J.; Zhang, J.; Peng, W.; Sun, Z.; Guo, Z. Dynamic Impedances of Offshore Rock-Socketed Monopiles. J. Mar. Sci. Eng. 2019, 7, 134.

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