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A numerical study on the lateral loading behaviour of offshore tetrapod piled jacket foundations in clay

A numerical study on the lateral loading behaviour of offshore tetrapod piled jacket foundations in clay
A numerical study on the lateral loading behaviour of offshore tetrapod piled jacket foundations in clay
Jacket foundations for offshore wind turbines, typically having three or four latticework legs, are mainly subjected to lateral loads induced by winds, waves and currents during their service life. An accurate assessment of the bearing capacity of these foundations is of great importance in the design. This paper presents a study into the monotonic lateral loading behavior of tetrapod piled jacket foundations in undrained clay, with the complex lateral loads being simplified to an equivalent lateral load acting at a certain height of the jacket. A centrifuge testing programme was undertaken to provide high-quality validation data for the development of a three-dimensional finite element model established using ABAQUS. The key parameters investigated are the spacing and embedment of the piles, the height to which the equivalent lateral load acts and the angle between the direction of this load and the orthogonal line of the jacket in the horizontal plane. The parametric study aims to provide guidance to the optimal design of jacket piled foundations: for instance, to examine the critical pile embedment beyond which limited improvement of the bearing capacity of the foundation can be achieved and to define the most unfavorable lateral loading direction. In addition, the limitations of the commonly assumed constant p-multiplier, regardless of the lateral deflection of the pile and the depth along it, are critically discussed. Then an improved analytical model is proposed, based on the existing model used in design and the parametric study results, to quantify the variation of p-multiplier with depth and with pile deflection.
0141-1187
165-177
Zhu, Bin
ee25a477-df4e-4f8c-8a3f-35a54a45edca
Wen, Kai
f2914054-5942-445d-9138-a8007243794c
Kong, Deqiong
3f140cdd-5ba6-4679-bb7d-9e6de042e3ec
Zhu, Zhoujie
0afdb2bb-da9c-45f2-a707-15893d5fcba4
Wang, Lujun
25c936ce-95fd-4828-b64a-ca610683978c
Zhu, Bin
ee25a477-df4e-4f8c-8a3f-35a54a45edca
Wen, Kai
f2914054-5942-445d-9138-a8007243794c
Kong, Deqiong
3f140cdd-5ba6-4679-bb7d-9e6de042e3ec
Zhu, Zhoujie
0afdb2bb-da9c-45f2-a707-15893d5fcba4
Wang, Lujun
25c936ce-95fd-4828-b64a-ca610683978c

Zhu, Bin, Wen, Kai, Kong, Deqiong, Zhu, Zhoujie and Wang, Lujun (2018) A numerical study on the lateral loading behaviour of offshore tetrapod piled jacket foundations in clay. Applied Ocean Research, 75, 165-177. (doi:10.1016/j.apor.2018.04.001).

Record type: Article

Abstract

Jacket foundations for offshore wind turbines, typically having three or four latticework legs, are mainly subjected to lateral loads induced by winds, waves and currents during their service life. An accurate assessment of the bearing capacity of these foundations is of great importance in the design. This paper presents a study into the monotonic lateral loading behavior of tetrapod piled jacket foundations in undrained clay, with the complex lateral loads being simplified to an equivalent lateral load acting at a certain height of the jacket. A centrifuge testing programme was undertaken to provide high-quality validation data for the development of a three-dimensional finite element model established using ABAQUS. The key parameters investigated are the spacing and embedment of the piles, the height to which the equivalent lateral load acts and the angle between the direction of this load and the orthogonal line of the jacket in the horizontal plane. The parametric study aims to provide guidance to the optimal design of jacket piled foundations: for instance, to examine the critical pile embedment beyond which limited improvement of the bearing capacity of the foundation can be achieved and to define the most unfavorable lateral loading direction. In addition, the limitations of the commonly assumed constant p-multiplier, regardless of the lateral deflection of the pile and the depth along it, are critically discussed. Then an improved analytical model is proposed, based on the existing model used in design and the parametric study results, to quantify the variation of p-multiplier with depth and with pile deflection.

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More information

Accepted/In Press date: 2 April 2018
e-pub ahead of print date: 11 April 2018
Published date: 11 April 2018

Identifiers

Local EPrints ID: 490409
URI: http://eprints.soton.ac.uk/id/eprint/490409
ISSN: 0141-1187
PURE UUID: 39b22813-ab9b-4f98-8a3b-cdb5b0780a92
ORCID for Kai Wen: ORCID iD orcid.org/0009-0007-8066-1552

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Date deposited: 24 May 2024 16:57
Last modified: 25 May 2024 02:10

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Contributors

Author: Bin Zhu
Author: Kai Wen ORCID iD
Author: Deqiong Kong
Author: Zhoujie Zhu
Author: Lujun Wang

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