Local joint flexibility of two-planar tubular DK-joints in OWTs subjected to axial loading: Parametric study of geometrical effects and design formulation

Ahmadi, Hamid ORCID: https://orcid.org/0000-0002-6192-6275 and Nejad, Ali Ziaei (2017) Local joint flexibility of two-planar tubular DK-joints in OWTs subjected to axial loading: Parametric study of geometrical effects and design formulation. Ocean Engineering, 136. pp. 1-10. ISSN 0029-8018


Abstract

Tubular DK-joint is one of the most common joint types in jacket substructure of offshore wind turbines (OWTs). Results of a parametric investigation carried out on the local joint flexibility (LJF) of two-planar tubular DK-joints under axial loading are presented and discussed in this paper. A total of 162 finite element (FE) analyses were conducted on 81 FE models under two types of axial loading in order to study the effect of the geometrical properties of the DK-joint on the LJF factor (fLJF). Developed FE models were validated based on the available experimental data, FE results, and parametric equations. The weld profile effects were also studied. The fLJF in two-planar DK- and uniplanar K-joints were compared. Results showed that the multi-planarity effect on the LJF is considerable and consequently the application of the equations already available for uniplanar K-joints to calculate the fLJF in two-planar DK-joints can result in highly over-predicting results. To tackle this problem, FE results were used to derive a set of parametric formulas for the prediction of the fLJF in axially loaded two-planar DK-joints and the developed formulas were checked according to the UK DoE acceptance criteria.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 26 Jul 2022 03:32
Last Modified: 26 Jul 2022 23:25
Uncontrolled Keywords: Local Joint Flexibility (LJF), Two-planar tubular DK-joint, Axial loading, Jacket substructure, Offshore Wind Turbine (OWT)
Fields of Research (2020): 40 ENGINEERING > 4015 Maritime engineering > 401504 Ship and platform structures (incl. maritime hydrodynamics)
40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
Socio-Economic Objectives (2020): 17 ENERGY > 1708 Renewable energy > 170808 Wind energy
Identification Number or DOI: https://doi.org/10.1016/j.oceaneng.2017.03.011
URI: http://eprints.usq.edu.au/id/eprint/50257

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