Analysis on the seismic dynamic responses of wind turbine structures on different kinds of soil grounds

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (10) : 261-268.

LIU Zhongsheng1，LI Chun1,2，YANG Yang1，ZOU Jinhua1

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Abstract

The seismic simulation model for a WindPACT 1.5 MW wind turbine was built up based on the opensourced code FAST and the Wolf’s theory to consider the soilstructure interaction. Nine types of time series of ground acceleration were designed to define the seismic motion based on three different kinds of soils and three different levels of earthquake intensities. By analyzing the structural dynamic responses of the wind turbine under different conditions, it is shown that the influence of earthquake on the blades is weak, and the dynamic behaviors of blades are mainly affected by aerodynamic loads. The towertop displacement and towerbase bending moment increase with the increase of earthquake intensity. Under the same earthquake, there are great differences in the towertop displacement and towerbase moment for different kinds of soil grounds, especially the lateral displacement at the towertop and the pitching torque on the towerbase. The bending moment of the tower is linearly related to the height of the tower and decreases with the height of the tower, and the bending moment and shear force of the tower are the largest at the towerbase. Under the earthquake with eight level fortification intensity, the lateral displacement at the towertop of wind turbine has an increase of 475%, 359%, and 335% for soft soil, still clay soil and rock still soils respectively, compared with the condition without earthquake. This is because the energy dissipated by the damping of soft soil is the smallest,which results in the minimal reduction of tower responses after earthquake. Therefore, the seismic loads must be considered in the case of soft soil.

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wind turbine / soil-structure interaction / seismic / dynamic response

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LIU Zhongsheng1，LI Chun1,2，YANG Yang1，ZOU Jinhua1. Analysis on the seismic dynamic responses of wind turbine structures on different kinds of soil grounds[J]. Journal of Vibration and Shock, 2018, 37(10): 261-268

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