Lateral Dynamic Response of Offshore Pipe Piles Considering Effect of Superstructure

Hao Liu, Jiaxuan Li (), Xiaoyan Yang, Libo Chen, Wenbing Wu, Minjie Wen, Mingjie Jiang and Changjiang Guo
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Hao Liu: Faculty of Engineering, Zhejiang Institute, China University of Geosciences, Wuhan 430074, China
Jiaxuan Li: Faculty of Engineering, Zhejiang Institute, China University of Geosciences, Wuhan 430074, China
Xiaoyan Yang: School of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan 430205, China
Libo Chen: Faculty of Engineering, Zhejiang Institute, China University of Geosciences, Wuhan 430074, China
Wenbing Wu: Faculty of Engineering, Zhejiang Institute, China University of Geosciences, Wuhan 430074, China
Minjie Wen: Research Center of Coastal Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
Mingjie Jiang: Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China
Changjiang Guo: China Railway 16th Bureau Group No. 3 Engineering Co., Ltd., Huzhou 313000, China

Energies, 2022, vol. 15, issue 18, 1-20

Abstract: The dynamic characteristics of pipe piles are of considerable importance for the dynamic foundation design of offshore wind turbines. In this study, we develop an analytical model for the lateral vibration of offshore pipe piles with consideration of the inertia effect and axial loading from the superstructure. A coupled dynamic saturated soil–pile interaction model is established based on Biot’s poroelastic theory and Euler–Bernoulli theory. The potential function, operator decomposition method, variable separation method and matrix transfer method are introduced herein to obtain the lateral force of the inner and outer soil acting on the pile shaft. Then, the analytical solution of the pile dynamic impedance in the frequency domain is derived by employing the soil–pile continuous deformation conditions and the boundary conditions of the pile. The rationality and accuracy of the presented solution have were by comparing its results with those predicted by existing solutions. The influence of superstructure, pile geometry and soil plug height on the lateral dynamic impedance and natural frequency of pipe piles was thoroughly investigated based on the theoretical model. The main findings can be summarized as: (1) The dynamic stiffness of piles will be remarkably underestimated if the inertia effect of the superstructure is not accounted for. (2) The vertical load of the superstructure is main factor affecting the natural frequency, whereas the inertia effect of the superstructure will enlarge the resonance amplitude. (3) The overall lateral dynamic impedance and first-order natural frequency of the pile increase significantly with the soil plug height.

Keywords: pipe pile; lateral dynamic response; natural frequency; offshore wind turbine; superstructure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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