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Ocean Systems Engineering
  Volume 14, Number 3, September 2024 , pages 237-259
DOI: https://doi.org/10.12989/ose.2024.14.3.237
 

Stress concentration factors for multi-planar tubular KK-joints of jacket substructures in offshore wind turbines
Hamid Ahmadi and Adel Alizadeh Atalo

 
Abstract
    Although the investigation on the effect of loaded out-of-plane braces on the values of the stress concentration factor (SCF) in offshore tubular joints has been the objective of numerous research works, a number of quite important cases still exist that have not been studied thoroughly due to the diversity of joint types and loading conditions. One of these cases is the multi-planar tubular KK-joint subjected to axial loading. Tubular KK-joints are among the most common joint types in jacket substructure of offshore wind turbines (OWTs). In the present research, data extracted from the stress analysis of 243 finite element (FE) models, verified against available experimental data, was used to study the effects of geometrical parameters on the chord-side SCFs in multi-planar tubular KK-joints subjected to axial loading. Parametric FE study was followed by a set of nonlinear regression analyses to develop three new SCF parametric equations for the fatigue analysis and design of axially loaded multi-planar KK-joints.
 
Key Words
    fatigue; jacket substructure; offshore wind turbine (OWT); multi-planar tubular KK-joint; stress concentration factor (SCF)
 
Address
Hamid Ahmadi: National Centre for Maritime Engineering and Hydrodynamics, Australian Maritime College,
University of Tasmania, Australia;
Centre for Future Materials, Institute for Advanced Engineering and Space Sciences,
University of Southern Queensland, Australia
Adel Alizadeh Atalo: Faculty of Civil Engineering, University of Tabriz, Iran
 

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