Wind-induced dynamic amplification effects on the shallow foundation of a horizontal-axis wind turbine

Gao, Qian-Feng; Dong, Hui; Deng, Zengtong; Ma, Yiyue

doi:10.1016/j.compgeo.2017.03.003

Cited by 8 publications

(13 citation statements)

References 21 publications

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“…It is observed that the static contact pressure was not homogeneously distributed but exhibited large values on the downwind side and relatively small values on the upwind side. is finding is broadly in agreement with the monitored results and those reported in the literature [9]. e abnormal contact pressures at individual points in Case #1 appear due to stress concentrations when the eccentricity of the foundation is relatively small.…”

Section: Static Contactsupporting

confidence: 92%

“…e steel reinforcement cage is linked to the concrete using the embedded technique [30]. Coulomb's friction law with a friction coefficient of 0.35 is applied to simulate the tangential behavior between the foundation and the subsoil [4,9]. e contact in the normal direction at the interface between the foundation and the subsoil is considered to be a hard contact.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Wind turbines therein are usually supported by large-scale shallow foundations lied on the strongly weathered rock, karst, or residual soils. Unlike building structures, dynamic wind loads are the main forces for a wind turbine, which could produce considerable vibrations and increased stresses, strains, and deformations in the structure, foundation, and subsoil [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Zhou¹,

Xin-xi²,

Deng³

et al. 2021

Advances in Materials Science and Engineering

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The objective of this study is to examine the performance of the shallow reinforced concrete foundation of a large-scale wind turbine under the influence of environmental loads. A 2 MW horizontal-axis onshore wind turbine supported by a shallow concrete foundation was considered. The foundation stresses, foundation settlements, and static and dynamic contact pressures at various positions of the shallow foundation were monitored from the construction phase to the operation phase in the field. Numerical simulations were also performed to further analyze the behavior of the wind turbine foundation in different cases. The results demonstrate that the responses of the reinforced concrete foundation, i.e., foundation stresses, contact pressures, and foundation settlements, were variables closely related to the wind direction and wind speed. The distribution of foundation stresses suggested that a reasonable design of steel reinforcement cages around the foundation steel ring is important. The dynamic contact pressure of the foundation could reach 5 kPa, so the influence of dynamic wind loads on the foundation response could not be always neglected, particularly for the foundations seated on weak soils. The foundation settlement during the operation phase could be characterized by the logistic model, but its distribution was uneven due to the presence of eccentric upper weight and wind load. The findings would provide guidance for the foundation design of onshore wind turbines in hilly areas.

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Section: Static Contactsupporting

confidence: 92%

Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Zhou¹,

Xin-xi²,

Deng³

et al. 2021

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Compared with the nonlinear elastic model, the elastoplastic model is considered more reliable to reflect the essential characteristics of the rock and soil. Normally, it is difficult to utilize the elastoplastic model to analyze the engineering field due to the complicated parameters [11][12][13][14][15][16]. Furthermore, the mathematical expression of a nonlinear constitutive model is relatively simple, and the physical meaning of parameters is clear and easy to determine based on the conventional triaxial test.…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Constitutive Model for Disintegrated Carbonaceous Mudstone Based on Logarithmic Functions

Qiu

Jiang

et al. 2021

Advances in Civil Engineering

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To study the mechanical characteristics of the disintegrated carbonaceous mudstone (DCM), consolidated drained triaxial tests were conducted on the DCM with three degrees of compaction (i.e., 90%, 93%, and 96%). Then, the nonlinear constitutive model suitable for the DCM was established based on test results using a logarithmic function. The stress-strain characteristics of the DCM were analyzed. The results revealed that the axial strain of the DCM was positively correlated with the deviatoric stress and lateral strain. The slopes of deviatoric stress-axial strain curves decreased with the increase of axial strain and so did the slopes of the axial strain-volumetric strain curves. The strength of the DCM increased with the increase of the confining pressure and the degree of compaction. In addition, the axial strain induced by dilatancy was also positively correlated with the degree of compaction and the confining pressure. Furthermore, under triaxial loading conditions, the relationship between the stress and strain of the DCM can be expressed by a logarithmic function; based on this, a nonlinear constitutive model with ten material parameters was derived. In addition, the results of numerical tests using the model showed similar stress-strain characteristics of the DCM comparing with the triaxial tests. Hence, it indicated that the nonlinear constitutive model based on the logarithmic function can reflect the nonlinear stress-strain characteristics of the DCM.

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Experimental tests on shallow foundations of onshore wind turbine towers

Lago

Flessati

Marveggio

et al. 2022

Structural Concrete

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The current effort towards the progressive switch from carbon‐based to renewable energy production is leading to a relevant spreading of both on‐ and off‐shore wind turbine towers. Regarding reinforced concrete shallow foundations of onshore wind turbine steel towers, possible reductions of reinforcement may increase their sustainability, speed of erection, and competitiveness. The article presents the results of an experimental program carried out at Politecnico di Milano concerning both cyclic and monotonic loading, simulating extreme wind conditions on 1:15 scaled models of wind turbine steel towers connected by stud bolt adapters to reinforced concrete shallow foundations embedded in a sandy soil. Three couples of foundation specimens were tested with different reinforcement layouts: (a) similar to current praxis, (b) without shear reinforcement, and (c) without shear reinforcement and with 50% of ordinary steel rebars replaced by steel fibers. Additional vertical loads were added to the small‐scale models in order to ensure similarity in terms of stresses. The test results allowed to (i) characterize the mechanical behavior of the foundation element considering soil‐structure interaction under both service and ultimate load conditions, (ii) assess the foundation failure mode, (iii) highlight the role of each typology of reinforcing bars forming the cage, and (iv) provide hints for the optimization of these latter.

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Wind-induced dynamic amplification effects on the shallow foundation of a horizontal-axis wind turbine

Cited by 8 publications

References 21 publications

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

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

A Nonlinear Constitutive Model for Disintegrated Carbonaceous Mudstone Based on Logarithmic Functions

Experimental tests on shallow foundations of onshore wind turbine towers

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