Study for predicting the earthquake-induced liquefaction around the monopile foundation of offshore wind turbines

Geng, Fei; Yang, Wenxian; Nadimi, Sadegh; Han, Bo; Huang, Guoxiang

doi:10.1016/j.oceaneng.2022.113421

Cited by 12 publications

(3 citation statements)

References 26 publications

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“…In reality, the seismic acceleration and lateral loads of the OWT due to waves will be coupled together to affect the motion and pore water pressure of the soil around the monopile foundation. In the present study, for simplicity, the lateral loads from waves are simplified as a cyclic point force acting on the tower of the OWT [26] . In the present study, the sea-wave cyclic load is obtained based on the common approach used for offshore structures through Morison's theory, linear wave theory (small-amplitude wave or Airy theory) [9,24] .…”

Section: Finite Element Analysis and Resultsmentioning

confidence: 99%

Dynamic Assessment of OWT under Coupled Seismic and Sea-wave Motions

Massah Fard,

Erken,

Ansal

2023

SUSTAIN MAR STRUCT

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The effect of soil-monopile-structure interaction is of great importance in the design of offshore wind turbines (OWTs). Although sea waves play the most effective role in the performance of OWTs, the coupled effect of sea-wave loads and seismic motion on the performance of the OWT system in seismic-prone areas is a factor that is less investigated and should not be ignored. In this regard, a 2-D porous model based on Biot’s poro-elastic theory is considered to capture the pore water pressure generation in the soil domain surrounding the OWT foundation. The coupled effect of sea waves and seismic motion through a comparative study is considered for the reference OWT system based on the monopile foundation by using the FE program, OpenSees. The results of the analyses are presented in specific locations. Upon the obtained results, the dynamic behavior of the OWT system and the possibility of liquefaction in the soil surrounding the OWT during applied loads are investigated and compared. This comparison is a good representative of the effect of the seismic motion on the performance of the OWT system and the soil medium by considering soil-monopile-structure interaction in seismic-prone areas.

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Section: Finite Element Analysis and Resultsmentioning

confidence: 99%

Dynamic Assessment of OWT under Coupled Seismic and Sea-wave Motions

Massah Fard,

Erken,

Ansal

2023

SUSTAIN MAR STRUCT

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“…Most of the previous research has been exclusively related to either the inertial interaction of ground founded OWTs or the kinematic seismic response of foundations 2,21,22 ; previous studies have mostly focused on how the eccentric the rotor‐nacelle‐assembly (RNA) is to the tower top and how the rotary inertia due to blades can influence the structural response of the wind turbines, or they have focused on the forces induced on the piles connected to rigid pile caps following ground motion. A few studies have considered the soil‐structure interaction problems of grounded OWT systems in liquefiable soils, but many issues are still uncertain 23,24 ; Haddad et al 25–30 …”

Section: Introductionmentioning

confidence: 99%

“…3 of the wind turbines, or they have focused on the forces induced on the piles connected to rigid pile caps following ground motion. A few studies have considered the soil-structure interaction problems of grounded OWT systems in liquefiable soils, but many issues are still uncertain 23,24 ; Haddad et al [25][26][27][28][29][30] In this study, a comprehensive series of nonlinear dynamic finite element (FE) effective stress analyses modeling the skirted circular foundations supporting OWTs with varied embedment ratios subjected to 20 outcropping rock motions were carried out.…”

Section: Introductionmentioning

confidence: 99%

A simplified procedure for the prediction of liquefaction‐induced settlement of offshore wind turbines supported by suction caisson foundation based on effective stress analyses and an ML‐based group method of data handling

Farahani,

Barari

2023

Earthq Engng Struct Dyn

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In this research, a series of non‐linear dynamic finite element (FE) effective stress analyses were conducted to analyze the influence of the suction caisson geometry, ground motion intensity and contact pressure caused by the offshore wind turbine (OWT) on the settlement pattern and seismic demand of the OWT's structure on saturated dense sand. The baseline model and the FE procedure were validated using a database of well‐documented centrifuge tests. However, particular attention was given to the calibration campaign based on the measured system response quantities, such as the settlement, acceleration and pore‐pressure time histories. The FE results identified the contact pressure as an important state parameter caused by the OWT's mass; the governing ground‐shaking intensity measures that play a significant role in the derivation of an analytical framework for predicting liquefaction‐induced OWT settlements during major events are the shaking intensity rate (SIR), Arias Intensity ( and spectral acceleration at a period equal to 1 s (T = 1 s). The results revealed that approximating expressions derived using the modified least‐squares method (MLSM) reasonably capture the complex phenomenon of liquefaction‐induced settlement, with some exceptions at lower SIR values. Finally, to obtain the approximating expressions, the database was combined with a machine learning (ML)‐based group method of data handling (GMDH) that appropriately describes the interplay of multiple properties of the foundation soil, structure and seismic events while incorporating the effect of the interaction between the suction caisson, foundation soil, excess pore‐pressure generation and cyclic shear stresses.

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Prediction of soil liquefaction for railway embankment resting on fine soil deposits using enhanced machine learning techniques

Ghani,

Kumari

2023

J Earth Syst Sci

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Study for predicting the earthquake-induced liquefaction around the monopile foundation of offshore wind turbines

Cited by 12 publications

References 26 publications

Dynamic Assessment of OWT under Coupled Seismic and Sea-wave Motions

Dynamic Assessment of OWT under Coupled Seismic and Sea-wave Motions

A simplified procedure for the prediction of liquefaction‐induced settlement of offshore wind turbines supported by suction caisson foundation based on effective stress analyses and an ML‐based group method of data handling

Prediction of soil liquefaction for railway embankment resting on fine soil deposits using enhanced machine learning techniques

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