TY - JOUR
T1 - From cyclic sand ratcheting to tilt accumulation of offshore monopiles
T2 - 3D FE modelling using SANISAND-MS
AU - Liu, Haoyuan
AU - Kementzetzidis, Evangelos
AU - Abell, José Antonio
AU - Pisanò, Federico
N1 - Funding Information:
The authors wish to acknowledge the China Scholarship Council (CSC) and the geo-engineering section of Delft University of Technology for financial support of the first author.
Publisher Copyright:
© 2021 Thomas Telford Ltd.
PY - 2021
Y1 - 2021
N2 - Serviceability criteria for offshore monopiles include the estimation of long-term, permanent tilt under repeated operational loads. In the lack of well-established analysis methods, experimental and numerical research has been carried out in the last decade to support the fundamental understanding of monopile-soil interaction mechanisms, and the conception of engineering methods for monopile tilt predictions. With a focus on the case of monopiles in sand, this work shows how step-by-step/implicit, three-dimensional (3D) finite-element (FE) modelling can be fruitfully applied to the analysis of cyclic monopile-soil interaction and related soil deformation mechanisms. To achieve adequate simulation of cyclic sand ratcheting and densification around the pile, the recently proposed SANISAND-MS model is adopted. The link between local soil behaviour and global monopile response to cyclic loading is discussed through detailed analysis of model prediction. Overall, the results of numerical parametric studies confirm that the proposed 3D FE modelling framework can reproduce relevant experimental evidence about monopile-soil interaction, and support future improvement of engineering design methods.
AB - Serviceability criteria for offshore monopiles include the estimation of long-term, permanent tilt under repeated operational loads. In the lack of well-established analysis methods, experimental and numerical research has been carried out in the last decade to support the fundamental understanding of monopile-soil interaction mechanisms, and the conception of engineering methods for monopile tilt predictions. With a focus on the case of monopiles in sand, this work shows how step-by-step/implicit, three-dimensional (3D) finite-element (FE) modelling can be fruitfully applied to the analysis of cyclic monopile-soil interaction and related soil deformation mechanisms. To achieve adequate simulation of cyclic sand ratcheting and densification around the pile, the recently proposed SANISAND-MS model is adopted. The link between local soil behaviour and global monopile response to cyclic loading is discussed through detailed analysis of model prediction. Overall, the results of numerical parametric studies confirm that the proposed 3D FE modelling framework can reproduce relevant experimental evidence about monopile-soil interaction, and support future improvement of engineering design methods.
KW - constitutive relations
KW - finite-element modelling
KW - footings/foundations
KW - offshore engineering
KW - repeated loading
UR - http://www.scopus.com/inward/record.url?scp=85116466235&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/eccfe75c-717b-3f1a-ac19-eb9966d851f2/
U2 - 10.1680/jgeot.20.P.029
DO - 10.1680/jgeot.20.P.029
M3 - Article
AN - SCOPUS:85116466235
SN - 0016-8505
VL - 72
SP - 753
EP - 768
JO - Geotechnique
JF - Geotechnique
IS - 9
ER -