Details
| Original language | English |
|---|---|
| Article number | 103838 |
| Journal | Computers and Geotechnics |
| Volume | 128 |
| Early online date | 3 Oct 2020 |
| Publication status | Published - Dec 2020 |
Abstract
Piles used for jacket type foundation of offshore wind turbine are subjected to highly cyclic tension and compressive loading. The pile capacity under cyclic tension loading decreases with increased number of loading cycles due to reduction of the pile shaft resistance. A numerical simulation scheme is presented, which allows the calculation of the pile capacity degradation (CDM) due to cyclic loading for driven steel piles. The volume compaction of soil near the pile surface during the cyclic loading is determined from the cyclic simple shear test results and 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, which are 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 different piles in sandy soil under cyclic axial loading are presented and compared with existing interaction diagrams. Finally, recommendations regarding further investigations and improvements of the method are given.
Keywords
- Capacity degradation, Cyclic axial loading, Interaction diagrams, Offshore, Piles
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
- Computer Science(all)
- Computer Science Applications
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In: Computers and Geotechnics, Vol. 128, 103838, 12.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Capacity degradation method for piles under cyclic axial loads
AU - Achmus, M.
AU - Kuo, Y. S.
AU - Abdel-Rahman, K.
AU - Tseng, Y. H.
AU - Pang, I.
PY - 2020/12
Y1 - 2020/12
N2 - Piles used for jacket type foundation of offshore wind turbine are subjected to highly cyclic tension and compressive loading. The pile capacity under cyclic tension loading decreases with increased number of loading cycles due to reduction of the pile shaft resistance. A numerical simulation scheme is presented, which allows the calculation of the pile capacity degradation (CDM) due to cyclic loading for driven steel piles. The volume compaction of soil near the pile surface during the cyclic loading is determined from the cyclic simple shear test results and 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, which are 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 different piles in sandy soil under cyclic axial loading are presented and compared with existing interaction diagrams. Finally, recommendations regarding further investigations and improvements of the method are given.
AB - Piles used for jacket type foundation of offshore wind turbine are subjected to highly cyclic tension and compressive loading. The pile capacity under cyclic tension loading decreases with increased number of loading cycles due to reduction of the pile shaft resistance. A numerical simulation scheme is presented, which allows the calculation of the pile capacity degradation (CDM) due to cyclic loading for driven steel piles. The volume compaction of soil near the pile surface during the cyclic loading is determined from the cyclic simple shear test results and 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, which are 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 different piles in sandy soil under cyclic axial loading are presented and compared with existing interaction diagrams. Finally, recommendations regarding further investigations and improvements of the method are given.
KW - Capacity degradation
KW - Cyclic axial loading
KW - Interaction diagrams
KW - Offshore
KW - Piles
UR - http://www.scopus.com/inward/record.url?scp=85091974720&partnerID=8YFLogxK
U2 - 10.1016/j.compgeo.2020.103838
DO - 10.1016/j.compgeo.2020.103838
M3 - Article
AN - SCOPUS:85091974720
VL - 128
JO - Computers and Geotechnics
JF - Computers and Geotechnics
SN - 0266-352X
M1 - 103838
ER -