Modeling Lifetime Performance of Monopile Foundations for Offshore Wind Applications
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 149, Issue 8
Abstract
This paper explores the application of a numerical method for modeling pseudorandom cyclic loading, at very large cycle numbers, to the design of offshore wind turbine foundations. The work expands the development of a novel constitutive modeling framework, the hyper-plastic accelerated ratcheting model (HARM), for which the key constitutive equations and the calibration method are presented. HARM captures both the nonlinear hysteretic behavior during cycling and the accumulation of permanent deformation (ratcheting) with large cycle numbers in a rigorous, yet computationally efficient manner, enabling the computation of foundation response over a lifetime of loading. This paper demonstrates how the approach can be applied to the cyclic pile field testing from the pile soil analysis (PISA) project. Following calibration, the model is used to assess pile response to three load signals representative of operational and extreme loads throughout the lifetime of a full-scale wind turbine foundation: (1) a short storm, (2) a 35-h storm, and (3) lifetime loading. The paper discusses how computational efficiency can be achieved while maintaining a high level of calculation accuracy.
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Data Availability Statement
Some data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. Some data, models, or code generated or used during the study are proprietary or confidential in nature and may only be provided with restrictions.
Acknowledgments
The authors acknowledge the contributions by Ørsted in providing support and funding for the development of this work. Byrne is supported by the Royal Academy of Engineering under the Research Chairs and Senior Research Fellowships scheme.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 149 • Issue 8 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 18, 2021
Accepted: Oct 17, 2022
Published online: May 17, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 17, 2023
ASCE Technical Topics:
- Coasts, oceans, ports, and waterways engineering
- Constitutive relations
- Continuum mechanics
- Cyclic loads
- Dynamic loads
- Dynamics (solid mechanics)
- Energy engineering
- Energy sources (by type)
- Engineering fundamentals
- Engineering mechanics
- Foundation design
- Foundations
- Geotechnical engineering
- Machine foundations
- Mathematics
- Models (by type)
- Numerical models
- Ocean engineering
- Offshore structures
- Renewable energy
- Solid mechanics
- Structural dynamics
- Wind loads
- Wind power
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