Assessment of wind turbine seismic risk : existing literature and simple study of tower moment demand.

Prowell, Ian; Veers, Paul S.

doi:10.2172/983699

Cited by 35 publications

(16 citation statements)

References 11 publications

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“…In particular, comparative analyses in the time domain between the results obtained by fully-coupled simulation performed in GH BLADED [27] and those obtained by linear combination of separate wind and earthquake responses, the latter computed by adding different levels of aerodynamic damping, are carried out. The results show that errors in bending moment and shear forces are within engineering margins, which is encouraging for the use of the uncoupling approach, and confirm that a value of 4% for the aerodynamic damping, recommended by ASCE-AWEA RP2011 [17] and in previous studies [6][7][8][9][10][11][12][13][14][15][16][17][18], can reasonably also be used in time-domain uncoupled analyses.…”

Section: Structural Model Of the Tower And Aerodynamic Dampingsupporting

confidence: 74%

“…However, this is clearly a mere coincidence as, though similar in value, the two damping mechanisms are quite different. Subsequently, Prowell and Veers [7] performed a comprehensive study on the assessment of wind turbine seismic risk. Results showed that wind- In the past few years, researchers have tried to incorporate seismic loads into the structural assessment of wind turbines, and yet the work is limited.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Structural Model Of the Tower And Aerodynamic Dampingsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…Many attempts to study the seismic dynamic responses [6][7][8][9], structural safety [4,5,[10][11][12] and analytical methods [4,13] of wind turbines have been conducted. Most studies focused on onshore wind turbines, which are shorter in the cantilever length than their offshore counterparts.…”

Section: Introductionmentioning

confidence: 99%

Seismic Fragility Analysis of Monopile Offshore Wind Turbines under Different Operational Conditions

Kang

et al. 2017

Energies

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Offshore wind turbines in seismic active areas suffer from earthquake impacts. In this study, seismic fragility analysis of a monopile offshore wind turbine considering different operational conditions was performed. A finite element model for a 5 MW monopile offshore wind turbine was developed using the OpenSees platform. The interaction between the monopile and the seabed soil was modeled as a beam-on-nonlinear-winkler-foundation (BNWF). A nonlinear time history truncated incremental dynamic analysis (TIDA) was conducted to obtain seismic responses and engineering demand parameters. Potential damage states (DSs) were defined as excessive displacement at the nacelle, rotation at the tower top, and the allowable and yield stresses at the transition piece. Fragility curves were plotted to assess the probability of exceeding different damage states. It was found that seismic responses of the wind turbine are considerably influenced by environmental wind and wave loads. Subject to earthquake motions, wind turbines in normal operation at the rated wind speed experience higher levels of probability of exceeding damage states than those in other operational conditions, i.e., in idling or operating at higher or lower wind speed conditions.

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“…However, the natural period T obtained should not be larger than 1.4 times the value of the natural period as calculated with the empirical formula. Prowell and Veers [23] collected wind turbine data. Assuming an exponential relationship between the turbine's natural period and its height, the result of fitting the data is Equation (9):…”

Section: Structural Periodmentioning

confidence: 99%

Development of Seismic Demand for Chang-Bin Offshore Wind Farm in Taiwan Strait

et al. 2016

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Abstract:Taiwan is located on the Pacific seismic belt, and the soil conditions of Taiwan's offshore wind farms are softer than those in Europe. To ensure safety and stability of the offshore wind turbine supporting structures, it is important to assess the offshore wind farms seismic forces reasonably. In this paper, the relevant seismic and geological data are obtained for Chang-Bin offshore wind farm in Taiwan Strait, the probabilistic seismic hazard analysis (PSHA) is carried out, and the first uniform hazard response spectrum for Chang-Bin offshore wind farm is achieved. Compared with existing design response spectrum in the local regulation, this site-specific seismic hazard analysis has influence on the seismic force considered in the design of supporting structures and therefore affects the cost of the supporting structures. The results show that a site-specific seismic hazard analysis is required for high seismic area. The paper highlights the importance of seismic hazard analysis to assess the offshore wind farms seismic forces. The follow-up recommendations and research directions are given for Taiwan's offshore wind turbine supporting structures under seismic force considerations.

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Assessment of wind turbine seismic risk : existing literature and simple study of tower moment demand.

Cited by 35 publications

References 11 publications

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

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

Seismic Fragility Analysis of Monopile Offshore Wind Turbines under Different Operational Conditions

Development of Seismic Demand for Chang-Bin Offshore Wind Farm in Taiwan Strait

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