Seismic fragility analysis of 5 MW offshore wind turbine

Kim, Dong Hyawn; Lee, Sang Geun; Lee, Il Keun

doi:10.1016/j.renene.2013.09.023

Cited by 142 publications

(57 citation statements)

References 3 publications

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“…Although a definitive answer as to whether earthquake loads are design driving for the two structures under study can be given only considering sitespecific conditions, these results substantiate the need for an accurate seismic assessment when installing offshore HAWTs in seismically active areas. In this context, refined seismic analyses should be carried out, considering vertical ground motion, variation of earthquake acceleration through soil layers [15], potential misalignment between wind and wave loads during earthquake shaking, and other important issues such as sensitivity to different models of p − y curves [37] and potential uncertainties in soil properties [39], alterations of the foundation stiffness due to on May 12, 2018 http://rsta.royalsocietypublishing.org/ Downloaded from…”

Section: Discussionmentioning

confidence: 99%

“…Sensitivity of displacement and stress responses to seawater level, soil conditions and presence of a surrounding ice sheet has been investigated. Kim et al [15] have studied the seismic response of the NREL 5 MW HAWT on a monopile, under real and artificial earthquake ground motions occurring in the parked state. A simplified model of the HAWT has been implemented, with the RNA modelled as a lumped top mass; nonlinear springs have been introduced along the pile length to model soil stiffness, considering also the variation of the earthquake ground motion through different soil layers.…”

Section: Introductionmentioning

confidence: 99%

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Seismic analysis of offshore wind turbines on bottom-fixed support structures

Alati

Failla

Arena

2015

Phil. Trans. R. Soc. A.

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This study investigates the seismic response of a horizontal axis wind turbine on two bottom-fixed support structures for transitional water depths (30-60 m), a tripod and a jacket, both resting on pile foundations. Fully coupled, nonlinear time-domain simulations on full system models are carried out under combined wind-wave-earthquake loadings, for different load cases, considering fixed and flexible foundation models. It is shown that earthquake loading may cause a significant increase of stress resultant demands, even for moderate peak ground accelerations, and that fully coupled nonlinear time-domain simulations on full system models are essential to capture relevant information on the moment demand in the rotor blades, which cannot be predicted by analyses on simplified models allowed by existing standards. A comparison with some typical design load cases substantiates the need for an accurate seismic assessment in sites at risk from earthquakes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic analysis of offshore wind turbines on bottom-fixed support structures

Alati

Failla

Arena

2015

Phil. Trans. R. Soc. A.

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“…Some specific research has already been developed for onshore HAWT, considering the variability of ground motion intensity [30,31] and wind speed [32] separately, and for offshore HAWT under the combination of extreme wind and wave conditions [33]. Fragility is defined as the conditional probability of a damage measure (DM) attaining or exceeding a damage limit state for a given …”

Section: Fragility Curve Derivationmentioning

confidence: 99%

Some Results on the Vulnerability Assessment of HAWTs Subjected to Wind and Seismic Actions

et al. 2017

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Abstract:The spread of the wind energy industry has caused the construction of wind farms in areas prone to high seismic activity. Accordingly, the analysis of wind turbine loading associated with earthquakes is of crucial importance for an accurate assessment of their structural safety. Within this topic, this paper presents some preliminary results of a probabilistic framework intended to be used for the estimation of the probability of failure of Horizontal Axis Wind Turbine-supporting structures when subjected to the wind and seismic actions. In particular, the multi-hazard fragility curves of the wind turbine-supporting structure were calculated using Monte Carlo simulations. A decoupling approach consisting of aerodynamic analysis of the rigid rotor blade model and subsequent linear dynamic Finite Element analyses of the supporting structure, including aerodynamic damping, was used. The failure condition of the tower structure was estimated according to the stress design procedure proposed by EC3 for the buckling limit state assessment. Finally, the vulnerability assessment of HAWTs to wind and seismic actions was evaluated in terms of fragility curves describing the probability of failure of the supporting tower structure as a function of the Peak Ground Acceleration (PGA) for each parked and operational wind condition. In particular, the results highlight a probability of failure larger than 50% for high levels of seismic action (PGA greater than 0.7 g) combined with the rotor in parked condition (wind speed of 3 m/s) or in operational rated condition (wind speed of 11.4 m/s).

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“…Recently Katsanos [5] summarized the research performed by the scholars around the world, the developing of analysis methods are detailed introduced and the future research are enlightened in the paper. In recent research, Anastasopoulos [6], Kim [7] and Zheng [8] paid their attention to the responses of the fixed bottom OWT under seismic loads. Anastasopoulos [6] and Kim [7] discussed the nonlinearities of the foundation and substructure of the OWT under seismic loads by using FE method, Zheng [8] mainly focused on the interactions of seismic and wave loads for OWT under combined load cases.…”

Section: Introductionmentioning

confidence: 99%

“…In recent research, Anastasopoulos [6], Kim [7] and Zheng [8] paid their attention to the responses of the fixed bottom OWT under seismic loads. Anastasopoulos [6] and Kim [7] discussed the nonlinearities of the foundation and substructure of the OWT under seismic loads by using FE method, Zheng [8] mainly focused on the interactions of seismic and wave loads for OWT under combined load cases. The structural responses of the OWT show a significant variation under seismic loads, which may influence the safety of the structure.…”

Section: Introductionmentioning

confidence: 99%

Passive Control of a Pentapod Offshore Wind Turbine Under Earthquakes by Using Tuned Mass Damper

Wang

Gao

et al. 2017

Volume 10: Ocean Renewable Energy

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The finite element model (FEM) of a pentapod offshore wind turbine (OWT) is established in the newly compiled FAST. The dynamic responses of the OWT are analyzed in detail. Further, a tuned mass damper as a passive control strategy is applied in order to reduce the OWT responses under seismic loads. The influence of the tuned mass damper (TMD) locations, mass and control frequencies on the reduction of OWT responses are investigated. A general configuration of TMD can effectively reduce the local and global responses to some degree, but due to the complexity of characteristics of the OWT structure and seismic waves, the single TMD can not obtain consistent controlling effects.

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Seismic fragility analysis of 5 MW offshore wind turbine

Cited by 142 publications

References 3 publications

Seismic analysis of offshore wind turbines on bottom-fixed support structures

Seismic analysis of offshore wind turbines on bottom-fixed support structures

Some Results on the Vulnerability Assessment of HAWTs Subjected to Wind and Seismic Actions

Passive Control of a Pentapod Offshore Wind Turbine Under Earthquakes by Using Tuned Mass Damper

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