A case study of foundation damping in a piled offshore wind jacket structure

Authors

Aaron S. Bradshaw, University of Rhode Island
Maeve Story, University of Rhode Island
Irina Perepelitsa, University of Rhode Island
Christopher D.P. Baxter, University of Rhode Island
Nasim Partovi-Mehr, Tufts School of Engineering
Babak Moaveni, Tufts School of Engineering
Eric M. Hines, Tufts School of Engineering

Document Type

Article

Date of Original Version

5-1-2024

Abstract

This paper presents an assessment of foundation damping in piled offshore wind jacket structures through a case study of the Block Island Wind Farm (BIWF). Foundation damping is one of several sources of energy dissipation which can improve fatigue performance in offshore wind structures. Damping was quantified through operational model analysis (i.e. system identification) using structural health monitoring data combined with foundation damping modeling. The results showed that for the 1^st bending mode the hysteretic damping ratio of the pile under axial cyclic loading was estimated to range from 0.2% to 1.5%. This range was comparable in magnitude to the foundation damping ratios documented for operational offshore wind monopiles under lateral loading.

Publication Title, e.g., Journal

Soil Dynamics and Earthquake Engineering

Volume

180

Citation/Publisher Attribution

Bradshaw, Aaron S., Maeve Story, Irina Perepelitsa, Christopher D. Baxter, Nasim Partovi-Mehr, Babak Moaveni, and Eric M. Hines. "A case study of foundation damping in a piled offshore wind jacket structure." Soil Dynamics and Earthquake Engineering 180, (2024). doi: 10.1016/j.soildyn.2024.108605.