Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Seismic performance of shared suction caisson anchors installed in liquefiable sand for floating offshore wind turbines
https://orcid.org/0000-0003-0532-9852
https://orcid.org/0000-0001-9471-5530
Abstract Shared anchors will reduce the levelized cost of energy for floating offshore wind (FOW) arrays currently under active development in various seismically active regions. This study investigates the seismic performance of a shared suction caisson anchor installed in liquefiable sand for a FOW array using a nonlinear dynamic 3D finite element analysis. The advanced UBC3D-PLM constitutive model was calibrated against cyclic element tests then validated with centrifuge experimental data. Strong ground motions with orthogonal horizontal and vertical components were applied to the model with varying frequency content, peak ground acceleration (PGA), and orientation. The model captured the stress–strain response of the soil and evolution of excess pore pressure to the onset of liquefaction, which occurred after application of a PGA of 0.2 g and above. Despite significant liquefaction caused by a PGA of 0.8 g, displacement of the anchor remained within around 10% of anchor diameter. The results suggest some resilience to pull-out during seismic loading in liquefiable soils, even with vertical tensile loading on the anchor developed by the inverse catenary. Further investigation could be carried out under specific site conditions and serviceability criteria to optimize the size of the caisson and reduce costs while ensuring anchor performance during seismic loading.
Highlights Increasing PGA led to greater pull-out of the shared suction caisson anchor. Frequency content of the applied seismic motion influenced caisson displacement. A critical seismic loading orientation may be the greatest mooring line tension. Shared anchor displacement remained within typical serviceability limits. Results suggest resilience to shared anchor pull-out in liquefiable soils.
Seismic performance of shared suction caisson anchors installed in liquefiable sand for floating offshore wind turbines
https://orcid.org/0000-0003-0532-9852
https://orcid.org/0000-0001-9471-5530
Abstract Shared anchors will reduce the levelized cost of energy for floating offshore wind (FOW) arrays currently under active development in various seismically active regions. This study investigates the seismic performance of a shared suction caisson anchor installed in liquefiable sand for a FOW array using a nonlinear dynamic 3D finite element analysis. The advanced UBC3D-PLM constitutive model was calibrated against cyclic element tests then validated with centrifuge experimental data. Strong ground motions with orthogonal horizontal and vertical components were applied to the model with varying frequency content, peak ground acceleration (PGA), and orientation. The model captured the stress–strain response of the soil and evolution of excess pore pressure to the onset of liquefaction, which occurred after application of a PGA of 0.2 g and above. Despite significant liquefaction caused by a PGA of 0.8 g, displacement of the anchor remained within around 10% of anchor diameter. The results suggest some resilience to pull-out during seismic loading in liquefiable soils, even with vertical tensile loading on the anchor developed by the inverse catenary. Further investigation could be carried out under specific site conditions and serviceability criteria to optimize the size of the caisson and reduce costs while ensuring anchor performance during seismic loading.
Highlights Increasing PGA led to greater pull-out of the shared suction caisson anchor. Frequency content of the applied seismic motion influenced caisson displacement. A critical seismic loading orientation may be the greatest mooring line tension. Shared anchor displacement remained within typical serviceability limits. Results suggest resilience to shared anchor pull-out in liquefiable soils.
Seismic performance of shared suction caisson anchors installed in liquefiable sand for floating offshore wind turbines
https://orcid.org/0000-0003-0532-9852
https://orcid.org/0000-0001-9471-5530
Abstract Shared anchors will reduce the levelized cost of energy for floating offshore wind (FOW) arrays currently under active development in various seismically active regions. This study investigates the seismic performance of a shared suction caisson anchor installed in liquefiable sand for a FOW array using a nonlinear dynamic 3D finite element analysis. The advanced UBC3D-PLM constitutive model was calibrated against cyclic element tests then validated with centrifuge experimental data. Strong ground motions with orthogonal horizontal and vertical components were applied to the model with varying frequency content, peak ground acceleration (PGA), and orientation. The model captured the stress–strain response of the soil and evolution of excess pore pressure to the onset of liquefaction, which occurred after application of a PGA of 0.2 g and above. Despite significant liquefaction caused by a PGA of 0.8 g, displacement of the anchor remained within around 10% of anchor diameter. The results suggest some resilience to pull-out during seismic loading in liquefiable soils, even with vertical tensile loading on the anchor developed by the inverse catenary. Further investigation could be carried out under specific site conditions and serviceability criteria to optimize the size of the caisson and reduce costs while ensuring anchor performance during seismic loading.
Highlights Increasing PGA led to greater pull-out of the shared suction caisson anchor. Frequency content of the applied seismic motion influenced caisson displacement. A critical seismic loading orientation may be the greatest mooring line tension. Shared anchor displacement remained within typical serviceability limits. Results suggest resilience to shared anchor pull-out in liquefiable soils.
Seismic performance of shared suction caisson anchors installed in liquefiable sand for floating offshore wind turbines
Barron, James (Autor:in) / Rouainia, Mohamed (Autor:in) / Charlton, Tom (Autor:in) / Edwards, Stuart (Autor:in) / Gibson, Fraser (Autor:in)
10.03.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Conference Proceedings | 2022
Long term performance of suction caisson supported offshore wind turbines
| British Library Online Contents | 2011
Fuzzy modeling of holding capacity of offshore suction caisson anchors
| British Library Online Contents | 2017
3D Finite element analyses of suction caisson foundations for offshore wind turbines in drained sand
| Taylor & Francis Verlag | 2020