Vertical earthquake response of megawatt‐sized wind turbine with soil‐structure interaction effects

Kjørlaug, Remi André; Kaynia, Amir M.

doi:10.1002/eqe.2590

Cited by 62 publications

(21 citation statements)

References 25 publications

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“…Santangelo et al [23] studied the implementation of uncoupled analysis for wind and seismic loads for a 5 MW wind turbines. Kjørlaug and Kaynia [24] conducted analyses of megawatt-sized wind turbine subjected to the vertical earthquake using SAP200 software. This study concluded that vertical ground motions have significant bearing on the design of the tower and its connection to the nacelle and performance of the turbine after the earthquake.…”

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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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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“…Hongwang simplified offshore wind turbine with shallow foundation into a mass‐spring‐damper model to theoretically evaluate the seismic response. Prowell et al and Kjørlaug and Kaynia used finite element analysis methods to evaluate seismic response of offshore wind turbine.…”

Section: Introductionmentioning

confidence: 99%

Seismic evaluation of offshore wind turbine by geotechnical centrifuge test

Seong

Kim

2019

Wind Energy

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As offshore wind turbines are now planned to be installed at seismic activity areas around Asia in large numbers, understanding of the seismic behavior of offshore wind turbine has become essential to evade structural hazards due to earthquake. Although the seismic behavior of the structure is largely affected by soil‐foundation‐structure interaction (SFSI), there is only a few experimental data about this subject as conventional offshore wind turbines are mostly located in the area where earthquakes are scarce. Geotechnical centrifuge experiment can provide reliable experimental data for this subject as it can reproduce field stress condition of the soil and simulate earthquake motion in a scaled model test. In this research, three case studies using centrifuge model test were performed to evaluate the seismic behavior of offshore wind turbine during the earthquake and permanent deformation after the earthquake. The results were compared with conventional seismic evaluation methods. Monopile, Monopod, and Tripod foundations were chosen for the experiment. Peak acceleration and rotational displacement of the wind turbine for three cases were evaluated under various intensities of seismic loading applied by centrifuge‐mounted shaking table. Results were compared with conventional evaluation method for design acceleration and conventional rotational displacement criteria suggested in DNV‐OS‐J101.

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“…Prowell et al . and Kjørlaug et al . used finite element analysis methods to evaluate seismic response of offshore wind turbine.…”

Section: Introductionmentioning

confidence: 99%

Centrifuge modeling to evaluate natural frequency and seismic behavior of offshore wind turbine consideringSFSI

Seong

Kim

et al. 2017

Wind Energy

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Understanding of dynamic response of offshore wind turbine is important to reduce vibration of offshore wind turbine induced by structural and environmental loadings. Although dynamic characteristics of the offshore wind turbine such as natural frequency and seismic behavior are affected by foundation and soil conditions, there are little experimental studies about the dynamic behavior of offshore wind turbine with consideration of proper soil–foundation–structure interaction (SFSI). The goal of this research is to evaluate the natural frequency and seismic behavior of offshore wind turbine with a monopod foundation considering SFSI. Scaled model of offshore wind turbine and monopod foundation is produced for this research. Geotechnical centrifuge tests in fixed‐based and SFSI condition were performed to measure natural frequency in each case. Also, a series of seismic loadings with different intensities are applied to observe seismic behaviors of the offshore wind turbine during the earthquake and permanent changes after the earthquake. Experimental results show apparent natural frequency reduction in SFSI condition compared with the fixed‐based condition, non‐linear changes in dynamic response during a series of earthquakes and permanent changes occurred in natural frequency and rotational displacement after earthquakes. Copyright © 2017 John Wiley & Sons, Ltd.

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Vertical earthquake response of megawatt‐sized wind turbine with soil‐structure interaction effects

Cited by 62 publications

References 25 publications

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

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

Seismic evaluation of offshore wind turbine by geotechnical centrifuge test

Centrifuge modeling to evaluate natural frequency and seismic behavior of offshore wind turbine consideringSFSI

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