Details
| Original language | English |
|---|---|
| Article number | 116733 |
| Number of pages | 12 |
| Journal | Ocean engineering |
| Volume | 294 |
| Early online date | 27 Jan 2024 |
| Publication status | Published - 15 Feb 2024 |
Abstract
In particular during storm events, a build-up of excess pore pressures may occur in the soil around cyclically loaded offshore foundations. Such accumulated excess pore pressure reduces the effective stresses in the soil and hence negatively affects the structural integrity. Even though the consideration of this degradation effect on the bearing capacity is commonly demanded by the involved certification or approval bodies, no generally applicable and accepted method for the calculative verification currently exists. The paper presents an approach which allows for the transfer of the soil behaviour observed in cyclic direct simple shear tests to the foundation structure system by means of a three-dimensional numerical model. The method is modular and can easily be assessed with engineering judgment in each substep. The used approach enables the consideration of site-specific cyclic laboratory test results by taking into account the mean stress, the cyclic shear stress amplitude and the number of load cycles at each integration point of the numerical model. Hence, the numerical approach may contribute to the optimisation of common foundation solutions as well as to the verification of innovative foundation structures even in complex soil conditions.
Keywords
- Contour plot, Cyclic element tests, Direct simple shear, Excess pore pressure accumulation, Finite element model, Foundation design, Monopile, Offshore, Partially drained conditions
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Engineering(all)
- Ocean Engineering
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In: Ocean engineering, Vol. 294, 116733, 15.02.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Estimation of capacity decrease due to accumulated excess pore pressures around cyclically loaded offshore foundations in sand
AU - Saathoff, Jann Eike
AU - Achmus, Martin
N1 - Funding Information: The investigations reported were funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - SFB1463 – 434502799. The support is gratefully acknowledged.
PY - 2024/2/15
Y1 - 2024/2/15
N2 - In particular during storm events, a build-up of excess pore pressures may occur in the soil around cyclically loaded offshore foundations. Such accumulated excess pore pressure reduces the effective stresses in the soil and hence negatively affects the structural integrity. Even though the consideration of this degradation effect on the bearing capacity is commonly demanded by the involved certification or approval bodies, no generally applicable and accepted method for the calculative verification currently exists. The paper presents an approach which allows for the transfer of the soil behaviour observed in cyclic direct simple shear tests to the foundation structure system by means of a three-dimensional numerical model. The method is modular and can easily be assessed with engineering judgment in each substep. The used approach enables the consideration of site-specific cyclic laboratory test results by taking into account the mean stress, the cyclic shear stress amplitude and the number of load cycles at each integration point of the numerical model. Hence, the numerical approach may contribute to the optimisation of common foundation solutions as well as to the verification of innovative foundation structures even in complex soil conditions.
AB - In particular during storm events, a build-up of excess pore pressures may occur in the soil around cyclically loaded offshore foundations. Such accumulated excess pore pressure reduces the effective stresses in the soil and hence negatively affects the structural integrity. Even though the consideration of this degradation effect on the bearing capacity is commonly demanded by the involved certification or approval bodies, no generally applicable and accepted method for the calculative verification currently exists. The paper presents an approach which allows for the transfer of the soil behaviour observed in cyclic direct simple shear tests to the foundation structure system by means of a three-dimensional numerical model. The method is modular and can easily be assessed with engineering judgment in each substep. The used approach enables the consideration of site-specific cyclic laboratory test results by taking into account the mean stress, the cyclic shear stress amplitude and the number of load cycles at each integration point of the numerical model. Hence, the numerical approach may contribute to the optimisation of common foundation solutions as well as to the verification of innovative foundation structures even in complex soil conditions.
KW - Contour plot
KW - Cyclic element tests
KW - Direct simple shear
KW - Excess pore pressure accumulation
KW - Finite element model
KW - Foundation design
KW - Monopile
KW - Offshore
KW - Partially drained conditions
UR - http://www.scopus.com/inward/record.url?scp=85183517451&partnerID=8YFLogxK
U2 - 10.1016/j.oceaneng.2024.116733
DO - 10.1016/j.oceaneng.2024.116733
M3 - Article
AN - SCOPUS:85183517451
VL - 294
JO - Ocean engineering
JF - Ocean engineering
SN - 0029-8018
M1 - 116733
ER -