STOCHASTIC LOADING DEVICE AND MODEL TEST ON BELLED PILE FONDATION AND TOWER OF WIND TURBINES IN LOESS

Zhang Xun; Liu Jia; Xu Hongcheng; Yao Wenbo

doi:10.19912/j.0254-0096.tynxb.2024-2108

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 606-615. DOI: 10.19912/j.0254-0096.tynxb.2024-2108

STOCHASTIC LOADING DEVICE AND MODEL TEST ON BELLED PILE FONDATION AND TOWER OF WIND TURBINES IN LOESS

Zhang Xun, Liu Jia, Xu Hongcheng, Yao Wenbo

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Abstract

In the field of wind turbine engineering, the accurate analysis of the cumulative deformation of pile foundations and structures under long-term stochastic wind loads has been hindered by the absence of an appropriate simulation loading apparatus. To fill this gap, a novel hydraulic-actuated device with automatic control capabilities for simulating stochastic wind loads is designed and developed. A 1g reduced scale model test is conducted to comprehensively verify the loading performance of the proposed device, and to deeply analyze the cumulative deformation response of the belled pile foundation and tower, as well as to explore the action mechanism of various influencing factors. The test results demonstrate that the designed simulated loading device can stably output long - term stochastic loads. The output load shows a high degree of consistency with the theoretical calculation curve. Regarding the loading error caused by the inertia of the actuator rod of the selected hydraulic actuator, it is significantly affected by low wind speeds, while the impact of the loading frequency on this error is negligible. For the belled pile foundation in loess, the lateral cumulative displacement and vertical cumulative settlement at the top increase rapidly in the initial stage of stochastic loading and then gradually reach a stable state. These deformation values increase dramatically with the rise in wind speed, whereas the changes in deformation due to variations in frequency are extremely small. Under different average wind speeds and loading frequencies, the variations in the lateral cumulative displacement at the top of the tower and the belled pile foundation are positively correlated. However, due to the influence of pile - soil interaction, as well as the changes in mean wind speed and loading frequency, the amplitude of the lateral cumulative displacement during the initial rising stage and the variation characteristics of the increase in lateral cumulative displacement during the stable stage are significantly different.

Key words

wind power / pile foundations / error analysis / stochastic loading device / model test / cumulative displacement

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Zhang Xun, Liu Jia, Xu Hongcheng, Yao Wenbo. STOCHASTIC LOADING DEVICE AND MODEL TEST ON BELLED PILE FONDATION AND TOWER OF WIND TURBINES IN LOESS[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 606-615 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2108

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