CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES

Bibliographic Details
Main Author:	Li, Xinyao
Language:	English
Published:	Case Western Reserve University School of Graduate Studies / OhioLINK 2020
Subjects:	Civil Engineering Geotechnology Ocean Engineering cyclic load finite element analysis geotechnical centrifuge test hybrid foundation monotonic load offshore wind turbine seismic load soil pressure
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=case1594728306295576

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-case15947283062955762021-08-16T05:10:40Z CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES Li, Xinyao Civil Engineering Geotechnology Ocean Engineering cyclic load finite element analysis geotechnical centrifuge test hybrid foundation monotonic load offshore wind turbine seismic load soil pressure 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. 2020-09-07 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1594728306295576 http://rave.ohiolink.edu/etdc/view?acc_num=case1594728306295576 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Civil Engineering Geotechnology Ocean Engineering cyclic load finite element analysis geotechnical centrifuge test hybrid foundation monotonic load offshore wind turbine seismic load soil pressure
spellingShingle	Civil Engineering Geotechnology Ocean Engineering cyclic load finite element analysis geotechnical centrifuge test hybrid foundation monotonic load offshore wind turbine seismic load soil pressure Li, Xinyao CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES
author	Li, Xinyao
author_facet	Li, Xinyao
author_sort	Li, Xinyao
title	CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES
title_short	CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES
title_full	CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES
title_fullStr	CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES
title_full_unstemmed	CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES
title_sort	centrifuge modelling and numerical simulation of novel hybrid foundations for offshore wind turbines
publisher	Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate	2020
url	http://rave.ohiolink.edu/etdc/view?acc_num=case1594728306295576
work_keys_str_mv	AT lixinyao centrifugemodellingandnumericalsimulationofnovelhybridfoundationsforoffshorewindturbines
_version_	1719460023105486848

CENTRIFUGE MODELLING AND NUMERICAL SIMULATION OF NOVEL HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES

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