Evaluation of Response Spectral Analysis for Large Land Based Wind Turbines in a Near Fault Area

Abstract eng:
The dynamic response of a 5-MW land based wind turbine is calculated using different analysis methods. These methods include time history analysis using a large number of recorded near-fault ground motions; response spectral analysis using spectral shapes recommended in design codes; and that using near-fault specific response spectral model. The turbine tower is modelled with three dimensional beam-column elements with head masses lumped at the top of the tower. Results from linear elastic time series simulation indicate that overturning moment demand for a range of earthquake magnitude may exceed that due to extreme wind loads, making seismic loading in the near field a design-driving factor. It is found that the dominant period of near-fault ground motion relative to the fundamental structural period is a critical factor controlling seismic response. The results indicate that Eurocode 8 spectral shapes, even when scaled by peak ground acceleration of recorded near-fault ground motions, are not suitable to simulate seismic response of wind turbines. The response simulated using a near-fault specific response spectral model [1, 2] shows good correlation with those obtained from time history analysis.

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