Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study
With the rapid development of offshore wind energy in Europe, a large number of piled structures are being installed. Driven pipe piles are adopted as a foundation solution for the majority of offshore wind turbine support structures. In soils consisting of very dense sand, pile driving induces larg...
Published in: | Volume 6: Polar and Arctic Sciences and Technology; Offshore Geotechnics; Petroleum Technology Symposium |
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Online Access: | https://biblio.ugent.be/publication/8696185 http://hdl.handle.net/1854/LU-8696185 https://doi.org/10.1115/OMAE2013-10664 https://biblio.ugent.be/publication/8696185/file/8696190 |
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ftunivgent:oai:archive.ugent.be:8696185 2023-06-11T04:07:33+02:00 Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study Ozsu, Erdem Ta, An-Ninh Stuyts, Bruno Jaeck, Christophe 2013 application/pdf https://biblio.ugent.be/publication/8696185 http://hdl.handle.net/1854/LU-8696185 https://doi.org/10.1115/OMAE2013-10664 https://biblio.ugent.be/publication/8696185/file/8696190 eng eng American Society of Mechanical Engineers (ASME) https://biblio.ugent.be/publication/8696185 http://hdl.handle.net/1854/LU-8696185 http://dx.doi.org/10.1115/OMAE2013-10664 https://biblio.ugent.be/publication/8696185/file/8696190 No license (in copyright) info:eu-repo/semantics/restrictedAccess PROCEEDINGS OF THE ASME 32ND INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING - 2013 - VOL 6 ISBN: 978-0-7918-5540-9 Technology and Engineering conference info:eu-repo/semantics/conferenceObject info:eu-repo/semantics/publishedVersion 2013 ftunivgent https://doi.org/10.1115/OMAE2013-10664 2023-05-10T22:50:41Z With the rapid development of offshore wind energy in Europe, a large number of piled structures are being installed. Driven pipe piles are adopted as a foundation solution for the majority of offshore wind turbine support structures. In soils consisting of very dense sand, pile driving induces large-amplitude stress cycles in pile material, which have to be accounted for in fatigue calculations. These stress cycles can be calculated using one-dimensional wave equation analysis. Different ways of reducing pile driving damage are presented. Depending on the soil surrounding the pile and the target penetration depth, an optimum driving sequence can be established which minimises pile damage. As damage depends more on induced stresses than on the number of hammer blows, reducing the hammer energy at some point during driving can be beneficial for reducing the accumulated damage. In this paper, an optimum driving sequence is developed for a generic soil profile consisting of very dense sand. The pile driving damage calculated with the optimum sequence is compared to the damage calculated when driving close to maximum hammer efficiency. Additionally, using a larger hammer can also be beneficial for reducing induced stresses when keeping the transmitted energy at a similar level. The paper also highlights the advantages of using pile driving monitoring or pile driving back-analysis for verifying the stress levels in the piles during driving. Offshore design standards allow a reduction of the damage fatigue factor for inspected members. This principle may be extended to monitored piles. The differences between data from pile driving monitoring and data from pile driving back-analysis are discussed and the potential impact on the damage fatigue factor is highlighted Finally, the potential conflict of pile driving fatigue requirements and pile capacity requirements is discussed. Both considerations should eventually lead to an optimized design which satisfies the required design equations. Conference Object Arctic Ghent University Academic Bibliography Volume 6: Polar and Arctic Sciences and Technology; Offshore Geotechnics; Petroleum Technology Symposium |
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Ghent University Academic Bibliography |
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ftunivgent |
language |
English |
topic |
Technology and Engineering |
spellingShingle |
Technology and Engineering Ozsu, Erdem Ta, An-Ninh Stuyts, Bruno Jaeck, Christophe Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study |
topic_facet |
Technology and Engineering |
description |
With the rapid development of offshore wind energy in Europe, a large number of piled structures are being installed. Driven pipe piles are adopted as a foundation solution for the majority of offshore wind turbine support structures. In soils consisting of very dense sand, pile driving induces large-amplitude stress cycles in pile material, which have to be accounted for in fatigue calculations. These stress cycles can be calculated using one-dimensional wave equation analysis. Different ways of reducing pile driving damage are presented. Depending on the soil surrounding the pile and the target penetration depth, an optimum driving sequence can be established which minimises pile damage. As damage depends more on induced stresses than on the number of hammer blows, reducing the hammer energy at some point during driving can be beneficial for reducing the accumulated damage. In this paper, an optimum driving sequence is developed for a generic soil profile consisting of very dense sand. The pile driving damage calculated with the optimum sequence is compared to the damage calculated when driving close to maximum hammer efficiency. Additionally, using a larger hammer can also be beneficial for reducing induced stresses when keeping the transmitted energy at a similar level. The paper also highlights the advantages of using pile driving monitoring or pile driving back-analysis for verifying the stress levels in the piles during driving. Offshore design standards allow a reduction of the damage fatigue factor for inspected members. This principle may be extended to monitored piles. The differences between data from pile driving monitoring and data from pile driving back-analysis are discussed and the potential impact on the damage fatigue factor is highlighted Finally, the potential conflict of pile driving fatigue requirements and pile capacity requirements is discussed. Both considerations should eventually lead to an optimized design which satisfies the required design equations. |
format |
Conference Object |
author |
Ozsu, Erdem Ta, An-Ninh Stuyts, Bruno Jaeck, Christophe |
author_facet |
Ozsu, Erdem Ta, An-Ninh Stuyts, Bruno Jaeck, Christophe |
author_sort |
Ozsu, Erdem |
title |
Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study |
title_short |
Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study |
title_full |
Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study |
title_fullStr |
Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study |
title_full_unstemmed |
Optimizing pile driving fatigue for offshore foundations in very dense sand : a case study |
title_sort |
optimizing pile driving fatigue for offshore foundations in very dense sand : a case study |
publisher |
American Society of Mechanical Engineers (ASME) |
publishDate |
2013 |
url |
https://biblio.ugent.be/publication/8696185 http://hdl.handle.net/1854/LU-8696185 https://doi.org/10.1115/OMAE2013-10664 https://biblio.ugent.be/publication/8696185/file/8696190 |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
PROCEEDINGS OF THE ASME 32ND INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING - 2013 - VOL 6 ISBN: 978-0-7918-5540-9 |
op_relation |
https://biblio.ugent.be/publication/8696185 http://hdl.handle.net/1854/LU-8696185 http://dx.doi.org/10.1115/OMAE2013-10664 https://biblio.ugent.be/publication/8696185/file/8696190 |
op_rights |
No license (in copyright) info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1115/OMAE2013-10664 |
container_title |
Volume 6: Polar and Arctic Sciences and Technology; Offshore Geotechnics; Petroleum Technology Symposium |
_version_ |
1768380734255398912 |