Details
| Original language | English |
|---|---|
| Journal | Geotechnical testing journal |
| Volume | 44 |
| Issue number | 3 |
| Early online date | 15 Feb 2021 |
| Publication status | Published - 1 Nov 2021 |
Abstract
Although suction buckets are believed to be a promising alternative for multipod foundations of offshore wind turbines, the economic and ecological advantages are still limited because of a lack of knowledge regarding the tensile bearing behavior. Major uncertainties exist in terms of the response under cyclic loading and the assessment of the partially drained loading condition, where negative differential pressure beneath the suction bucket's lid contributes to the total tensile resistance. This article presents findings from 1-g model tests of suction buckets in sand subjected to various cyclic tensile loads. The suction bucket was installed via negative differential pressure (suction). The results show a strong effect of the applied load magnitude on the evolution of displacement, plug heave, and suction induced. Greater displacement accumulation is observed for the smaller considered frequency. Monotonic tests with varying displacement rates supplement the cyclic tests and serve for the verification of a hydraulic-mechanic coupled finite element model, which is afterward utilized for the back-calculation of cyclic model tests. Although a rather simple elasto-plastic material law was used for the sand, good agreement was found, indicating that the bearing behavior is mainly governed by the hydraulic conditions and only subordinately by the soil mechanics.
Keywords
- Model tests, Numerical simulation, Offshore foundations, Sand, Soil-structure interaction, Suction bucket, Tensile loading
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
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In: Geotechnical testing journal, Vol. 44, No. 3, 01.11.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Suction bucket foundations under cyclic tensile loading-physical and numerical modeling
AU - Gütz, P.
AU - Achmus, M.
N1 - Funding Information: This study was carried out in scope of the research project “Bearing behavior of suction bucket foundations under tensile loading in non-cohesive soils” (project no. 266046182) funded by German Research Foundation (DFG). The authors sincerely acknowledge DFG support.
PY - 2021/11/1
Y1 - 2021/11/1
N2 - Although suction buckets are believed to be a promising alternative for multipod foundations of offshore wind turbines, the economic and ecological advantages are still limited because of a lack of knowledge regarding the tensile bearing behavior. Major uncertainties exist in terms of the response under cyclic loading and the assessment of the partially drained loading condition, where negative differential pressure beneath the suction bucket's lid contributes to the total tensile resistance. This article presents findings from 1-g model tests of suction buckets in sand subjected to various cyclic tensile loads. The suction bucket was installed via negative differential pressure (suction). The results show a strong effect of the applied load magnitude on the evolution of displacement, plug heave, and suction induced. Greater displacement accumulation is observed for the smaller considered frequency. Monotonic tests with varying displacement rates supplement the cyclic tests and serve for the verification of a hydraulic-mechanic coupled finite element model, which is afterward utilized for the back-calculation of cyclic model tests. Although a rather simple elasto-plastic material law was used for the sand, good agreement was found, indicating that the bearing behavior is mainly governed by the hydraulic conditions and only subordinately by the soil mechanics.
AB - Although suction buckets are believed to be a promising alternative for multipod foundations of offshore wind turbines, the economic and ecological advantages are still limited because of a lack of knowledge regarding the tensile bearing behavior. Major uncertainties exist in terms of the response under cyclic loading and the assessment of the partially drained loading condition, where negative differential pressure beneath the suction bucket's lid contributes to the total tensile resistance. This article presents findings from 1-g model tests of suction buckets in sand subjected to various cyclic tensile loads. The suction bucket was installed via negative differential pressure (suction). The results show a strong effect of the applied load magnitude on the evolution of displacement, plug heave, and suction induced. Greater displacement accumulation is observed for the smaller considered frequency. Monotonic tests with varying displacement rates supplement the cyclic tests and serve for the verification of a hydraulic-mechanic coupled finite element model, which is afterward utilized for the back-calculation of cyclic model tests. Although a rather simple elasto-plastic material law was used for the sand, good agreement was found, indicating that the bearing behavior is mainly governed by the hydraulic conditions and only subordinately by the soil mechanics.
KW - Model tests
KW - Numerical simulation
KW - Offshore foundations
KW - Sand
KW - Soil-structure interaction
KW - Suction bucket
KW - Tensile loading
UR - http://www.scopus.com/inward/record.url?scp=85100892026&partnerID=8YFLogxK
U2 - 10.1520/GTJ20200056
DO - 10.1520/GTJ20200056
M3 - Article
AN - SCOPUS:85100892026
VL - 44
JO - Geotechnical testing journal
JF - Geotechnical testing journal
SN - 0149-6115
IS - 3
ER -