Field experiments on laterally loaded piles for an offshore wind farm

Xu, DS; Xu, XY; Li, W; Fatahi, B

Field experiments on laterally loaded piles for an offshore wind farm

Xu, DS Xu, XY Li, W Fatahi, B

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Marine Structures, 2020, 69
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Xu, DS
dc.contributor.author	Xu, XY
dc.contributor.author	Li, W
dc.contributor.author	Fatahi, B https://orcid.org/0000-0002-7920-6946
dc.date.accessioned	2021-01-07T02:30:14Z
dc.date.available	2021-01-07T02:30:14Z
dc.date.issued	2020-01-01
dc.identifier.citation	Marine Structures, 2020, 69
dc.identifier.issn	0951-8339
dc.identifier.issn	1873-4170
dc.identifier.uri	http://hdl.handle.net/10453/145152
dc.description.abstract	© 2019 Elsevier Ltd Pile foundations are widely used to support offshore wind turbines due to their cost effectiveness and rapid constructions. Offshore piles must be designed with enough capacity to withstand overturning moments caused by wind turbines and other environmental factors such as wave excitations and extreme winds. In this study, a full-scale field experimental test is undertaken to determine the pile behaviour under various lateral loading conditions. A distributed fiber optic sensing technology is used to measure strains along two instrumented piles. The bending moments and lateral deflections are calculated from distributed fiber optic sensors, and then analysed with the various p-y methods. Field measurements indicated that for two offshore piles ZK01 and ZK28 with diameter of 2 m and length of 71.5 m and 77.5 m, the maximum lateral movements under a given lateral load of 800 kN were 369.1 mm and 351.7 mm, respectively. The maximum bending moment occurred at 6.5 m and 5.5 m below seabed level with the corresponding depth of 12.15D and 11.95D for pile ZK01 and ZK28, respectively. The position of “zero crossing” of soil resistance for two instrumented piles is almost the same, even though the piles have different lengths. The lateral deflections and bending moments of the two instrumented piles are predicted by the API and hyperbolic method, which indicates that the hyperbolic method yields larger prediction errors than the API method. A modified p-y approach is then proposed for more reliable predictions when compared with field measurements.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Marine Structures
dc.relation.isbasedon	10.1016/j.marstruc.2019.102684
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0905 Civil Engineering, 0911 Maritime Engineering
dc.subject.classification	Civil Engineering
dc.title	Field experiments on laterally loaded piles for an offshore wind farm
dc.type	Journal Article
utslib.citation.volume	69
utslib.for	0905 Civil Engineering
utslib.for	0911 Maritime Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-01-07T02:30:07Z
pubs.publication-status	Published
pubs.volume	69

Abstract:

© 2019 Elsevier Ltd Pile foundations are widely used to support offshore wind turbines due to their cost effectiveness and rapid constructions. Offshore piles must be designed with enough capacity to withstand overturning moments caused by wind turbines and other environmental factors such as wave excitations and extreme winds. In this study, a full-scale field experimental test is undertaken to determine the pile behaviour under various lateral loading conditions. A distributed fiber optic sensing technology is used to measure strains along two instrumented piles. The bending moments and lateral deflections are calculated from distributed fiber optic sensors, and then analysed with the various p-y methods. Field measurements indicated that for two offshore piles ZK01 and ZK28 with diameter of 2 m and length of 71.5 m and 77.5 m, the maximum lateral movements under a given lateral load of 800 kN were 369.1 mm and 351.7 mm, respectively. The maximum bending moment occurred at 6.5 m and 5.5 m below seabed level with the corresponding depth of 12.15D and 11.95D for pile ZK01 and ZK28, respectively. The position of “zero crossing” of soil resistance for two instrumented piles is almost the same, even though the piles have different lengths. The lateral deflections and bending moments of the two instrumented piles are predicted by the API and hyperbolic method, which indicates that the hyperbolic method yields larger prediction errors than the API method. A modified p-y approach is then proposed for more reliable predictions when compared with field measurements.

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http://hdl.handle.net/10453/145152