Details
| Original language | English |
|---|---|
| Title of host publication | The 30th International Ocean and Polar Engineering Conference |
| Publisher | International Society of Offshore and Polar Engineers |
| ISBN (electronic) | 9781880653845 |
| Publication status | Published - 11 Oct 2020 |
| Event | 30th International Ocean and Polar Engineering Conference, ISOPE 2020 - Virtual, Online Duration: 11 Oct 2020 → 16 Oct 2020 |
Publication series
| Name | Proceedings of the International Offshore and Polar Engineering Conference |
|---|---|
| ISSN (Print) | 1098-6189 |
| ISSN (electronic) | 1555-1792 |
Abstract
The world’s demand for energy is growing everyday and special attention is being given to sustainable energy sources like wind energy. This leads to the need for implementation of offshore wind turbines. In German sea regions, the water depths are predominately between about 20.0 m and maximum 50.0 m. Here, the cyclic loading by wind and waves leads to cyclic loads acting on the foundation. At the time being, in most cases monopile foundations are applied. However, for certain subsoil conditions also a gravity base foundation might be suitable and economic. Offshore support structures are exposed to millions of load cycles during their service time. Under such high cycle numbers, accumulated permanent deformation may affect the serviceability of offshore support structures. In particular, the accumulated rotation of the foundation structure is crucial regarding serviceability proofs of offshore wind turbines. The objective of this paper is to investigate the applicability of the ‘stiffness degradation method’ (SDM) to predict the behaviour of gravity base foundation under cyclic loading. The SDM uses the results of cyclic triaxial tests to account for the cyclic soil behaviour in a numerical simulation with the finite element method. This approach was initially developed to describe the behavior of monopile foundation systems. The method and its adaptations for gravity base foundations are briefly described. The measurements at a full-scale prototype of the gravity base foundation conducted a few years ago are utilized as a benchmark problem. Based on the comparison of the SDM results to the measurements, hints and recommendations regarding the application of SDM to gravity base foundations are given.
Keywords
- Cyclic behavior, FEM, Gravity base foundations, Offshore support structures, Stiffness degradation method (SDM)
ASJC Scopus subject areas
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- Ocean Engineering
- Engineering(all)
- Mechanical Engineering
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The 30th International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers, 2020. ISOPE-I-20-2218 (Proceedings of the International Offshore and Polar Engineering Conference).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research
}
TY - GEN
T1 - Numerical Investigation of the Behaviour of Gravity Base Foundations Under Cyclic Loading
AU - Cao, Shuhan
AU - Achmus, Martin
AU - Abdel-Rahman, Khalid
N1 - Publisher Copyright: © 2020 by the International Society of Offshore and Polar Engineers (ISOPE). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/11
Y1 - 2020/10/11
N2 - The world’s demand for energy is growing everyday and special attention is being given to sustainable energy sources like wind energy. This leads to the need for implementation of offshore wind turbines. In German sea regions, the water depths are predominately between about 20.0 m and maximum 50.0 m. Here, the cyclic loading by wind and waves leads to cyclic loads acting on the foundation. At the time being, in most cases monopile foundations are applied. However, for certain subsoil conditions also a gravity base foundation might be suitable and economic. Offshore support structures are exposed to millions of load cycles during their service time. Under such high cycle numbers, accumulated permanent deformation may affect the serviceability of offshore support structures. In particular, the accumulated rotation of the foundation structure is crucial regarding serviceability proofs of offshore wind turbines. The objective of this paper is to investigate the applicability of the ‘stiffness degradation method’ (SDM) to predict the behaviour of gravity base foundation under cyclic loading. The SDM uses the results of cyclic triaxial tests to account for the cyclic soil behaviour in a numerical simulation with the finite element method. This approach was initially developed to describe the behavior of monopile foundation systems. The method and its adaptations for gravity base foundations are briefly described. The measurements at a full-scale prototype of the gravity base foundation conducted a few years ago are utilized as a benchmark problem. Based on the comparison of the SDM results to the measurements, hints and recommendations regarding the application of SDM to gravity base foundations are given.
AB - The world’s demand for energy is growing everyday and special attention is being given to sustainable energy sources like wind energy. This leads to the need for implementation of offshore wind turbines. In German sea regions, the water depths are predominately between about 20.0 m and maximum 50.0 m. Here, the cyclic loading by wind and waves leads to cyclic loads acting on the foundation. At the time being, in most cases monopile foundations are applied. However, for certain subsoil conditions also a gravity base foundation might be suitable and economic. Offshore support structures are exposed to millions of load cycles during their service time. Under such high cycle numbers, accumulated permanent deformation may affect the serviceability of offshore support structures. In particular, the accumulated rotation of the foundation structure is crucial regarding serviceability proofs of offshore wind turbines. The objective of this paper is to investigate the applicability of the ‘stiffness degradation method’ (SDM) to predict the behaviour of gravity base foundation under cyclic loading. The SDM uses the results of cyclic triaxial tests to account for the cyclic soil behaviour in a numerical simulation with the finite element method. This approach was initially developed to describe the behavior of monopile foundation systems. The method and its adaptations for gravity base foundations are briefly described. The measurements at a full-scale prototype of the gravity base foundation conducted a few years ago are utilized as a benchmark problem. Based on the comparison of the SDM results to the measurements, hints and recommendations regarding the application of SDM to gravity base foundations are given.
KW - Cyclic behavior
KW - FEM
KW - Gravity base foundations
KW - Offshore support structures
KW - Stiffness degradation method (SDM)
UR - http://www.scopus.com/inward/record.url?scp=85090878086&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85090878086
T3 - Proceedings of the International Offshore and Polar Engineering Conference
BT - The 30th International Ocean and Polar Engineering Conference
PB - International Society of Offshore and Polar Engineers
T2 - 30th International Ocean and Polar Engineering Conference, ISOPE 2020
Y2 - 11 October 2020 through 16 October 2020
ER -