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Centrifuge Modelling and Numerical Simulation of Novel Hybrid Foundations for Offshore Wind Turbines.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Centrifuge Modelling and Numerical Simulation of Novel Hybrid Foundations for Offshore Wind Turbines./
作者:	Li, Xinyao.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	185 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
Contained By:	Dissertations Abstracts International83-05B.
標題:	Geotechnology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28830570
ISBN:	9798460404681

Centrifuge Modelling and Numerical Simulation of Novel Hybrid Foundations for Offshore Wind Turbines.
Li, Xinyao.

Centrifuge Modelling and Numerical Simulation of Novel Hybrid Foundations for Offshore Wind Turbines. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 185 p.

Source: Dissertations Abstracts International, Volume: 83-05, Section: B.

Thesis (Ph.D.)--Case Western Reserve University, 2020.

This item must not be sold to any third party vendors.

Offshore wind energy has experienced rapid development in recent years. The foundation structure plays an important role in maintaining the serviceability and stability of the offshore wind turbine (OWT). In a harsh marine environment, the foundation structure is subjected to different types of loads. The self-weight of the structure produces a low vertical load comparing to other typical structures. The governing loads are the horizontal load due to the wind, wave, and current, and the overturning moment load generated by the horizontal load. Additionally, OWTs erected in the earthquake zones are also subjected to the seismic load. Under such a combination of loads, the foundation structure of OWT is required to have enough resistance to avoid the risk of overturning, excessive settlement, or other types of failures. In this study, a novel hybrid foundation for OWT is proposed to tackle the above challenges. The hybrid foundation names as MFB foundation consists of three major components: monopile, friction wheel, and suction bucket. The bucket and friction wheel structure have the same diameter and they are integrated together. The monopile passes through the sleeve in the center of the friction wheel. Gravels or other materials are filled into the friction wheel to provide vertical dead load. The bucket is installed by penetrating the soil which can enhance the soil structure interaction. Centrifuge tests are conducted to study the behavior of the hybrid foundations under lateral monotonic load, lateral cyclic load, and seismic load in different cohesionless soil conditions. Models with different dimensions are tested to investigate the influence of the bucket diameter and depth on the performance. A simplified method to calculate the bearing capacity of the MFB foundation is proposed which is calculated component by component. The calculation method is modified based on several existing theories of traditional lateral loaded foundation structures. In the seismic tests, it was found that the hybrid component can affect the occurrence of the liquefaction of the surrounding soil. A numerical simulation is conducted to compare with the centrifuge lateral load test. The soil pressure on monopile and bucket components was studied in the numerical model.

ISBN: 9798460404681Subjects--Topical Terms:

1018558
Geotechnology.
Subjects--Index Terms:

Cyclic load

Centrifuge Modelling and Numerical Simulation of Novel Hybrid Foundations for Offshore Wind Turbines.
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520 $a Offshore wind energy has experienced rapid development in recent years. The foundation structure plays an important role in maintaining the serviceability and stability of the offshore wind turbine (OWT). In a harsh marine environment, the foundation structure is subjected to different types of loads. The self-weight of the structure produces a low vertical load comparing to other typical structures. The governing loads are the horizontal load due to the wind, wave, and current, and the overturning moment load generated by the horizontal load. Additionally, OWTs erected in the earthquake zones are also subjected to the seismic load. Under such a combination of loads, the foundation structure of OWT is required to have enough resistance to avoid the risk of overturning, excessive settlement, or other types of failures. In this study, a novel hybrid foundation for OWT is proposed to tackle the above challenges. The hybrid foundation names as MFB foundation consists of three major components: monopile, friction wheel, and suction bucket. The bucket and friction wheel structure have the same diameter and they are integrated together. The monopile passes through the sleeve in the center of the friction wheel. Gravels or other materials are filled into the friction wheel to provide vertical dead load. The bucket is installed by penetrating the soil which can enhance the soil structure interaction. Centrifuge tests are conducted to study the behavior of the hybrid foundations under lateral monotonic load, lateral cyclic load, and seismic load in different cohesionless soil conditions. Models with different dimensions are tested to investigate the influence of the bucket diameter and depth on the performance. A simplified method to calculate the bearing capacity of the MFB foundation is proposed which is calculated component by component. The calculation method is modified based on several existing theories of traditional lateral loaded foundation structures. In the seismic tests, it was found that the hybrid component can affect the occurrence of the liquefaction of the surrounding soil. A numerical simulation is conducted to compare with the centrifuge lateral load test. The soil pressure on monopile and bucket components was studied in the numerical model.
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