Capacity Degradation Method for Driven Steel Piles Under Cyclic Axial Loading

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  • National Cheng Kung University
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Details

Original languageEnglish
Title of host publicationProceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017
PublisherSociety of Petroleum Engineers (SPE)
ISBN (electronic)9781880653975
Publication statusPublished - 25 Jun 2017
Event27th International Ocean and Polar Engineering Conference, ISOPE 2017 - San Francisco, United States
Duration: 25 Jun 201730 Jun 2017

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (electronic)1555-1792

Abstract

The piles used for jacket type foundation for an offshore wind turbine are subjected to highly cyclic tension and compressive loading. The pile capacity under cyclic axial loading decreases with number of loading cycles due to the reduction of pile shaft resistance. A numerical simulation scheme is presented, which allows the calculation of pile capacity degradation (CDM) due to cyclic loading for driven steel piles. The volume compaction of soil near pile surface during the cyclic loading is determined from cyclic simple shear test results and is then applied to the pile-soil system. From the limited number of tests available, interaction diagrams have been developed, which give the number of load cycles leading to failure dependent on the mean load and the amplitude of the cyclic load portion, both related to the static pile capacity. However, such diagrams cannot account for different soil conditions or pile geometry and pile stiffness. The calculation results for piles with three different embedded lengths in sandy soil under cyclic loading in tension are presented and compared with the existing interaction diagrams. Finally, recommendations regarding necessary further investigations and improvements of the method are given.

Keywords

    Axial load, Capacity degradation method (CDM), Jacket type foundation, Offshore wind

ASJC Scopus subject areas

Cite this

Capacity Degradation Method for Driven Steel Piles Under Cyclic Axial Loading. / Achmus, Martin; Abdel-Rahman, Khalid; Schaefer, Dominik et al.
Proceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017. Society of Petroleum Engineers (SPE), 2017. ISOPE-I-17-321 (Proceedings of the International Offshore and Polar Engineering Conference).

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Achmus, M, Abdel-Rahman, K, Schaefer, D, Kuo, YS, Chung, CY & Tseng, YH 2017, Capacity Degradation Method for Driven Steel Piles Under Cyclic Axial Loading. in Proceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017., ISOPE-I-17-321, Proceedings of the International Offshore and Polar Engineering Conference, Society of Petroleum Engineers (SPE), 27th International Ocean and Polar Engineering Conference, ISOPE 2017, San Francisco, United States, 25 Jun 2017. <https://onepetro.org/ISOPEIOPEC/proceedings-abstract/ISOPE17/All-ISOPE17/ISOPE-I-17-321/17910>
Achmus, M., Abdel-Rahman, K., Schaefer, D., Kuo, Y. S., Chung, C. Y., & Tseng, Y. H. (2017). Capacity Degradation Method for Driven Steel Piles Under Cyclic Axial Loading. In Proceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017 Article ISOPE-I-17-321 (Proceedings of the International Offshore and Polar Engineering Conference). Society of Petroleum Engineers (SPE). https://onepetro.org/ISOPEIOPEC/proceedings-abstract/ISOPE17/All-ISOPE17/ISOPE-I-17-321/17910
Achmus M, Abdel-Rahman K, Schaefer D, Kuo YS, Chung CY, Tseng YH. Capacity Degradation Method for Driven Steel Piles Under Cyclic Axial Loading. In Proceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017. Society of Petroleum Engineers (SPE). 2017. ISOPE-I-17-321. (Proceedings of the International Offshore and Polar Engineering Conference).
Achmus, Martin ; Abdel-Rahman, Khalid ; Schaefer, Dominik et al. / Capacity Degradation Method for Driven Steel Piles Under Cyclic Axial Loading. Proceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017. Society of Petroleum Engineers (SPE), 2017. (Proceedings of the International Offshore and Polar Engineering Conference).
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abstract = "The piles used for jacket type foundation for an offshore wind turbine are subjected to highly cyclic tension and compressive loading. The pile capacity under cyclic axial loading decreases with number of loading cycles due to the reduction of pile shaft resistance. A numerical simulation scheme is presented, which allows the calculation of pile capacity degradation (CDM) due to cyclic loading for driven steel piles. The volume compaction of soil near pile surface during the cyclic loading is determined from cyclic simple shear test results and is then applied to the pile-soil system. From the limited number of tests available, interaction diagrams have been developed, which give the number of load cycles leading to failure dependent on the mean load and the amplitude of the cyclic load portion, both related to the static pile capacity. However, such diagrams cannot account for different soil conditions or pile geometry and pile stiffness. The calculation results for piles with three different embedded lengths in sandy soil under cyclic loading in tension are presented and compared with the existing interaction diagrams. Finally, recommendations regarding necessary further investigations and improvements of the method are given.",
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N2 - The piles used for jacket type foundation for an offshore wind turbine are subjected to highly cyclic tension and compressive loading. The pile capacity under cyclic axial loading decreases with number of loading cycles due to the reduction of pile shaft resistance. A numerical simulation scheme is presented, which allows the calculation of pile capacity degradation (CDM) due to cyclic loading for driven steel piles. The volume compaction of soil near pile surface during the cyclic loading is determined from cyclic simple shear test results and is then applied to the pile-soil system. From the limited number of tests available, interaction diagrams have been developed, which give the number of load cycles leading to failure dependent on the mean load and the amplitude of the cyclic load portion, both related to the static pile capacity. However, such diagrams cannot account for different soil conditions or pile geometry and pile stiffness. The calculation results for piles with three different embedded lengths in sandy soil under cyclic loading in tension are presented and compared with the existing interaction diagrams. Finally, recommendations regarding necessary further investigations and improvements of the method are given.

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