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Consideration of the Cyclic Degradation of Cohesive Soils in Pile Foundation Design for Onshore Wind Turbines
An onshore wind turbine foundation is typically designed for an intended life of 20 years, and often considered for an extended lifetime of 25 to 30 years. A wind turbine supported on a pile foundation is subjected to long-term cyclic axial loading and cyclic lateral loading due to dynamic vibrations primarily caused by wind loads and rotation of the blades. The cyclic loading may result in strength and stiffness degradation, accumulation of pile head displacement, significant reduction of pile capacity or even the failure of the wind turbine foundation. The potential for changes in the foundation stiffness could impact the operation frequency and foundation loads over time which could adversely influence wind turbine production and have implications for fatigue and ultimate loads on the foundation system. However, the long-term performance of pile foundations under cyclic loading has not been well incorporated in design standards of onshore wind turbine foundations. In this study, a comprehensive literature review has been performed on mechanisms of cyclic degradation of pile foundations in cohesive soil as well as the potential impact on the long-term performance of wind turbines. Additionally, this paper summarizes existing methods in evaluating cyclic behavior of pile foundations in cohesive soils and provides a framework for analysis of both axial and lateral cyclic degradation of soils supporting pile foundation designs for onshore wind turbines.
Consideration of the Cyclic Degradation of Cohesive Soils in Pile Foundation Design for Onshore Wind Turbines
An onshore wind turbine foundation is typically designed for an intended life of 20 years, and often considered for an extended lifetime of 25 to 30 years. A wind turbine supported on a pile foundation is subjected to long-term cyclic axial loading and cyclic lateral loading due to dynamic vibrations primarily caused by wind loads and rotation of the blades. The cyclic loading may result in strength and stiffness degradation, accumulation of pile head displacement, significant reduction of pile capacity or even the failure of the wind turbine foundation. The potential for changes in the foundation stiffness could impact the operation frequency and foundation loads over time which could adversely influence wind turbine production and have implications for fatigue and ultimate loads on the foundation system. However, the long-term performance of pile foundations under cyclic loading has not been well incorporated in design standards of onshore wind turbine foundations. In this study, a comprehensive literature review has been performed on mechanisms of cyclic degradation of pile foundations in cohesive soil as well as the potential impact on the long-term performance of wind turbines. Additionally, this paper summarizes existing methods in evaluating cyclic behavior of pile foundations in cohesive soils and provides a framework for analysis of both axial and lateral cyclic degradation of soils supporting pile foundation designs for onshore wind turbines.
Consideration of the Cyclic Degradation of Cohesive Soils in Pile Foundation Design for Onshore Wind Turbines
Yu, Hao (author) / Guzman, Carlos (author) / Ntambakwa, Eric (author)
Geo-Chicago 2016 ; 2016 ; Chicago, Illinois
Geo-Chicago 2016 ; 195-206
2016-08-08
Conference paper
Electronic Resource
English
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