Seismic fragility analysis of monopile offshore wind turbines considering ground motion directionality

Mo, Renjie; Cao, Renjing; Liu, Minghou; Li, Miao; Huang, Yun Ping

doi:10.1016/j.oceaneng.2021.109414

Cited by 37 publications

(5 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…is the instantaneous wind speed, V 0 (r, t) is the relative wind speed, Ω(t) is the rotational speed, a is the axial induction factor, a is the tangential induction factor, α(r, t) is the instantaneous local angle of attack, φ(r, t) is the flow angle, β(t) is the pitch angle, and κ(r) is the local pre-twist of the blade. The effective area A, density of air ρ and wind velocity V(y, t) determine the wind force acting on the tower [32,46]. Located at a vertical distance y, the wind load calculation formula of F Tower (y, t) can be expressed as:…”

Section: Aerodynamic Loadmentioning

confidence: 99%

“…Mardfekri and Gardoni [31] estimated the fragility of an offshore wind turbine subjected to environmental and operational loadings by developing probabilistic models. Mo et al [32] studied the influence of the directionality of an earthquake on the fragility of a 5 MW wind turbine. Asareh et al [11] studied the fragility of a 5 MW wind turbine designed by the NREL (National Renewable Energy Laboratory) [33] under the coupling excitation of aerodynamic and seismic loads based on a finite element model with 22 ground motion records.…”

Section: Introductionmentioning

confidence: 99%

“…Jin and Chi [41] analyzed the effect of the number of earthquake records on the seismic fragility analysis of high earth-rockfill dams. Mo et al [32] selected 28 near-field and 22 far-field ground motions as a suite. For wind turbines when only considering seismic loads, the influence of the number of records on accurate fragility estimation will be similar to the normal building structures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the Number of Ground Motions on Fragility Analysis of 5 MW Wind Turbines Subjected to Aerodynamic and Seismic Loads Interaction

Yuan

Xie

et al. 2022

Energies

View full text Add to dashboard Cite

In this paper, the influence of the number of ground motions on fragility analysis of 5 MW wind turbines under the excitation of aerodynamic and seismic loads is investigated to acquire the sufficient number of records for reasonable fragility estimation. Two scenarios, parked and normal operation, were simulated with the number of actual recorded ground motions ranging from 2 to 48. The fragility function parameters are estimated by utilizing the method of multiple stripe analysis (MSA), and the relationship between the number of ground motions and estimated parameters for each scenario is discussed. In addition, the influence of the number of ground motions on the range of estimated parameters with a 95% confidence interval is also discussed. The simulation results show that there are significant differences between the two scenarios in terms of fragility analysis for 5 MW wind turbines with the interaction of wind and seismic loads, and the lesser number of earthquakes is needed for a normal operation scenario compared to the parked scenario when obtaining the same accuracy fragility estimation. Furthermore, the appropriate number of ground motions to accurately estimate the fragility parameters of 5 MW wind turbines for the two scenarios is presented herein, which is almost unaffected by different wind spectra.

show abstract

Section: Aerodynamic Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the Number of Ground Motions on Fragility Analysis of 5 MW Wind Turbines Subjected to Aerodynamic and Seismic Loads Interaction

Yuan

Xie

et al. 2022

Energies

View full text Add to dashboard Cite

show abstract

“…The stability of offshore wind-turbine foundations is a prerequisite for the safe operation of wind farms [8,9]. Currently, offshore wind-power foundations, which are commonly used around the world, mainly include gravity foundation, pile foundation, tri-pod foundation, jacket foundation, bucket foundation, etc.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of Integrated Wet-Towing of a Triple-Bucket Jacket Foundation for Far-Offshore Applications

Yan

Guo

Wang

et al. 2021

JMSE

View full text Add to dashboard Cite

As a form of clean and low-carbon green energy, offshore wind power occupies an important position in the global energy structure. With the rapid development of the wind power industry, wind power projects gradually develop from offshore to far-offshore sea areas. The multi-bucket jacket foundation is a considerable foundation type for far off-shore projects, but high installation costs involving ship transportation with parted components and field installation has significantly hindered its wide application. In this study, based on a 6.7-MW triple-bucket jacket foundation (TBJF) project of a deep-sea wind farm in China, a new integrated wet-towing method of “jacket + triple-bucket foundation” composite structure was proposed, which is suitable for far long-distance transportation of far-offshore applications. The static-model test of both self-stability and wet-towing stability was conducted. Based on the test and the numerical results, the natural period of the foundation for different draft depths in hydrostatic water and the stability for different eccentric loads were first evaluated. Then, the effects of different wet-towing modes and sea conditions on the stability of the TBJF were investigated. Finally, the optimal wet-towing mode and applicable sea conditions for the TBJF structure were proposed.

show abstract

“…This idea was later corroborated by Wang and Zhang [12] for a wind turbine of 70 m high. More recent studies highlight the relevance of earthquake loads in the design of wind turbines considering 65 kW [13], 2 MW [14,15] or 5 MW [13,[15][16][17][18][19][20][21] systems. However, to the extent of the authors knowledge, there are few studies (e.g., [3,22,23]) in the scientific literature analysing the seismic behaviour of larger OWTs.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Seismic Response of Monopile-Supported Offshore Wind Turbines of Increasing Size from 5 to 15 MW including Dynamic Soil-Structure Interaction

Medina

Álamo

Quevedo-Reina

2021

JMSE

View full text Add to dashboard Cite

As a result of wind power’s expansion over the globe, offshore wind turbines (OWTs) are being projected in seismic prone areas. In parallel, the industry develops increasingly larger and more powerful generators. Many of the seismic response analyses of wind turbines conducted so far only consider smaller units. In this paper, a finite element substructuring model in frequency domain is used to compute the seismic response of four reference OWTs from 5 to 15 MW founded on monopiles embedded in several homogeneous soil profiles with shear wave velocities from 100 to 300 m/s and subjected to different accelerograms. The foundation behaviour is obtained through a continuum model including kinematic and inertial interaction. The relevance of soil-structure interaction and main trends of the seismic response of OWTs are inferred from the presented results. Although the seismic maximum bending moments increase with the size of the OWT system, their relevance with respect to the ones produced by design loads decreases as the turbine gets bigger. The same effect is observed for the shear forces if the soil is soft enough. The inclusion of SSI effects almost duplicates the seismic response when compared to the rigid base scenario.

show abstract

Seismic fragility analysis of monopile offshore wind turbines considering ground motion directionality

Cited by 37 publications

References 56 publications

Influence of the Number of Ground Motions on Fragility Analysis of 5 MW Wind Turbines Subjected to Aerodynamic and Seismic Loads Interaction

Influence of the Number of Ground Motions on Fragility Analysis of 5 MW Wind Turbines Subjected to Aerodynamic and Seismic Loads Interaction

Laboratory Study of Integrated Wet-Towing of a Triple-Bucket Jacket Foundation for Far-Offshore Applications

Evolution of the Seismic Response of Monopile-Supported Offshore Wind Turbines of Increasing Size from 5 to 15 MW including Dynamic Soil-Structure Interaction

Contact Info

Product

Resources

About