Abstract
AbstractThis paper studies the effect of soil–structural interaction (SSI) on gravity‐based wind turbine towers equipped with tuned mass dampers (TMDs) subjected to earthquake loading. A small‐scale shaking table test of wind turbine towers with TMD was conducted, and the results showed that using TMD designed considering SSI resulted in larger vibration suppression. A simplified analytical numerical model was developed for SSI analysis considering TMD. The effect of soil site class and the earthquake intensity on the response reduction efficiency of the TMD was also discussed using the simplified model. It is concluded that the TMD efficiency depends not only on the soil stiffness but also on the characteristics of the applied ground motions, both of which are affected by the site classes and earthquake intensity levels. Moreover, the peak acceleration ratio (PAR), the root mean square acceleration ratio (RAR), the peak displacement ratio (PDR), and the root mean square displacement ratio (RDR) of the top of the wind turbine tower were obtained with and without TMD for different earthquake intensities and sites. These parameters can be used as references for the rational selection of TMD parameters considering SSI.
Highlights
IntroductionThe worldwide wind capacity reached 600 GW by the end of 2018, with over 9.8% growth rate of total installed capacity since 2012.1 Wind farms are widely deployed in North America and Asia; some of them constructed in high-risk seismic zones.[1] the importance of considering seismic hazards in the design and assessment of wind turbine tower has led to an increasing research interest on the topic,[2,3,4,5] along with provisions for seismic loading included on wind turbine design guidelines.[6,7] To improve the efficiency in the generation of electricity from the wind, large-diameter rotors and thin wall slender towers are usually adopted in current designs, which are vulnerable to external excitations such as wind and seismic actions during their lifetime
The world has witnessed a fast growth of wind energy over the past few decades
Both the averaged and the individual results obtained for each record show that the efficiency of tuned mass dampers (TMDs) is almost unaffected by the earthquake intensity
Summary
The worldwide wind capacity reached 600 GW by the end of 2018, with over 9.8% growth rate of total installed capacity since 2012.1 Wind farms are widely deployed in North America and Asia; some of them constructed in high-risk seismic zones.[1] the importance of considering seismic hazards in the design and assessment of wind turbine tower has led to an increasing research interest on the topic,[2,3,4,5] along with provisions for seismic loading included on wind turbine design guidelines.[6,7] To improve the efficiency in the generation of electricity from the wind, large-diameter rotors and thin wall slender towers are usually adopted in current designs, which are vulnerable to external excitations such as wind and seismic actions during their lifetime. These excitations can lead to excessive vibrations in the wind turbine blades and the tower, resulting in a reduction of the electricity generation or even in the failure of the blades or the tower.[8,9] as wind turbine towers become taller, their safety and serviceability may be considerably reduced
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