Dynamic responses of the shallow foundation of an onshore wind turbine

Abstract

Wind is a dynamic variable, which produces rocking movements on wind turbines, and thus resulting in dynamic responses of foundations and the subsoil. This study attempts to examine the dynamic responses of the shallow foundation of an onshore wind turbine subjected to wind loads. To this end, a series of model tests considering different wind load conditions was carried out on a 1/10-scale physical model. The static responses, the dynamic responses and the dynamic amplification effects of the shallow foundation were subsequently measured and analysed. The results demonstrate that the dynamic responses of the wind turbine shallow foundation were visibly affected by both the mean wind load and the fluctuating wind load. At the rated wind speed, the maximum strain-based dynamic amplification factor (DAF) of the foundation baseplate reached as high as 1·65, the maximum deformation-based DAF of the foundation top was 1·14 and the maximum contact-pressure-based DAF on the downwind side was 1·14. In addition, the reliability of the physical model was discussed and the results were verified by comparison with the numerical data in the literature.

Field Monitoring and Numerical Analysis of the Reinforced Concrete Foundation of a Large‐Scale Wind Turbine

“…Similarly, it is derived that maximum dynamic contact pressure was 0.79 kPa and the dynamic amplification factor was 1.2% at DPC-90°; the maximum dynamic contact pressure was 0.62 kPa and the dynamic amplification factor was 1.0% at DPC-270°. ese findings were roughly in agreement with those reported by Deng et al [23], indicating that the wind load had a dynamic effect on the contact pressures of the wind turbine foundation.…”

“…It was noted that the vibration of the wind turbine tower induces a sort of forced, damped harmonic excitation in the foundation. More recently, Gao et al [9] and Deng et al [23] conducted numerical simulations and physical model tests on a 2 MW wind turbine subjected to random wind loads. e authors demonstrated that the surrounding environment of the wind turbine foundation is affected by dynamic wind loads, and the dynamic amplification factors strongly depend on the wind speed and spatial position.…”

Mixing Ratios and Cementing Mechanism of Similar Silty Mudstone Materials for Model Tests

“…en, the similarity ratios of other properties can be obtained, as shown in Table 1. erefore, the target properties of similar materials are derived from the properties of the raw rock based on the similarity ratios [13,14].…”

“…In recent years, the research results of similar materials of different types of rocks show that the key to improve the similarity between similar materials and raw rocks is to choose the right raw materials and adopt reasonable proportions [14][15][16]. For example, Yang et al [17], Chen and Fen [18], Wang et al [19], Liu and Liu [20], and He et al [21] among others studied the mixing ratios of similar materials for different types of soft rocks, such as red-bed soft rock, carbonaceous phyllite rock, and coal rock.…”

Shear Strength Deterioration of Compacted Residual Soils under a Wind Turbine due to Drying‐Wetting Cycles and Vibrations

“…Wind power generation technology has been developed rapidly in recent decades, making wind power the third largest power source after coal-fired power and hydropower. Although wind resources are more abundant in offshore areas, onshore wind farms have been a great concern because of their relatively low investment and mature technology [1]. For example, China has built 42,000 MW wind turbines in several provinces in the south, where hilly, plateau, and mountainous terrains exist, from 2016 to 2020 [2,3].…”