A study on the Local Joint Flexibility (LJF) of two-planar tubular DK-joints in jacket structures under in-plane bending loads |
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| Institution: | 1. Department of Mechanical Engineering, Linköping University, S-581 83 Linköping, Sweden;2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125, USA;3. Department of Engineering and Architecture, University of Parma, Viale Usberti 181/A, 43124 Parma, Italy;1. School of Ocean Science and Technology, Dalian University of Technology, Panjin 124000, China;2. Computer Science & Technology College, Dalian University of Technology, Dalian 116024, China;3. School of Software, Dalian University of Technology, Dalian 116620, China;1. School of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;2. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;1. Institute of Offshore Wind Energy, Kunsan National University, Jeollabuk-do, Republic of Korea;2. Advanced Structural Engineering Laboratory, Faculty of Civil Engineering, Ho Chi Minh City Open University, Ho Chi Minh City, Viet Nam;3. Steel Solution Research Center, POSCO, Incheon, Republic of Korea |
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| Abstract: | In the present paper, results of a parametric study conducted on the Local Joint Flexibility (LJF) of two-planar tubular DK-joints under In-Plane Bending (IPB) loads are presented. DK-joints are among the most common joint types in jacket substructure of Offshore Wind Turbines (OWTs). A total of 324 finite element (FE) analyses were carried out on 81 FE models under four types of IPB loading in order to investigate the effect of the DK-joint’s geometrical parameters on the LJF factor (fLJF). Based on the results of parametric study, the factors leading to the LJF reduction were introduced. Generated FE models were verified using the existing experimental data, FE results, and parametric equations. The effect of the weld profile was also considered. The fLJF in two-planar DK- and uniplanar K-joints were compared. Results indicated that the effect of multi-planarity on the LJF is quite significant and consequently the use of the equations already available for uniplanar K-joints to calculate the fLJF in two-planar DK-joints may lead to highly under-/over-predicting results. To handle this issue, the FE results were used to derive a set of parametric equations for the prediction of the fLJF in IPB-loaded two-planar DK-joints. The proposed equations were checked against the acceptance criteria recommended by the UK DoE and can be reliably used for the analysis and design of tubular joints in OWTs. |
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| Keywords: | Local Joint Flexibility (LJF) Two-planar tubular DK-joint Jacket substructure |
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