A Study on the Degree of Bending (DoB) in Two-Planar Tubular DYT-Joints of Offshore Jacket Structures: Geometrical Effects and Fatigue Design Formulation
Paper
Ahmadi, Hamid, Karampour, Hassan, Ghorbani, Mahdi and Fard, Hamid. 2023. "A Study on the Degree of Bending (DoB) in Two-Planar Tubular DYT-Joints of Offshore Jacket Structures: Geometrical Effects and Fatigue Design Formulation." ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023). Melbourne, Australia 11 - 16 Jun 2023 Australia. https://doi.org/10.1115/OMAE2023-100940
Paper/Presentation Title | A Study on the Degree of Bending (DoB) in Two-Planar Tubular DYT-Joints of Offshore Jacket Structures: Geometrical Effects and Fatigue Design Formulation |
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Presentation Type | Paper |
Authors | Ahmadi, Hamid, Karampour, Hassan, Ghorbani, Mahdi and Fard, Hamid |
Journal or Proceedings Title | Proceedings of the ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023) |
Journal Citation | 2 |
Number of Pages | 10 |
Year | 2023 |
Place of Publication | Australia |
ISBN | 9780791886847 |
Digital Object Identifier (DOI) | https://doi.org/10.1115/OMAE2023-100940 |
Web Address (URL) of Paper | https://asmedigitalcollection.asme.org/OMAE/proceedings-abstract/OMAE2023/86847/1166983 |
Web Address (URL) of Conference Proceedings | https://asmedigitalcollection.asme.org/OMAE/OMAE2023/volume/86847 |
Conference/Event | ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023) |
Event Details | ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023) Parent ASME International Conference on Ocean, Offshore and Arctic Engineering Delivery In person Event Date 11 to end of 16 Jun 2023 Event Location Melbourne, Australia Rank A |
Abstract | Through-the-thickness stress distribution in a tubular member has a profound effect on the fatigue behavior of tubular joints commonly found in steel offshore structures. This stress distribution can be characterized by the degree of bending (DoB). Although multi-planar joints are an intrinsic feature of offshore tubular structures and the multi-planarity usually has a considerable effect on the DoB values at the brace-to-chord intersection, few investigations have been reported on the DoB in multi-planar joints due to the complexity of the problem and high cost involved. In the present research, data extracted from the stress analysis of 243 finite element (FE) models, verified based on available parametric equations, was used to study the effects of geometrical parameters on the DoB values in twoplanar tubular DYT-joints. Results showed that it is quite common for an axially loaded two-planar DYT-joint to have a low DoB. Therefore, when the current standard HSS-based S-N approach is used for the fatigue analysis of axially loaded twoplanar DYT-joints, results should be modified to include the effect of the DoB in order to obtain more accurate fatigue life prediction. It was also concluded that for axially loaded twoplanar DYT-joints, the parametric formulas of uniplanar YTjoints are not applicable for the DoB prediction, since such formulas may lead to under-/over-predicting results. Parametric FE study was followed by a set of nonlinear regression analyses to develop six new DoB parametric equations for the fatigue analysis and design of axially loaded two-planar DYT-joints. |
Keywords | Fatigue; Offshore jacket structure; Two-planar tubular DYT-joint; Degree of bending (DoB) |
ANZSRC Field of Research 2020 | 400503. Complex civil systems |
400510. Structural engineering | |
401504. Ship and platform structures (incl. maritime hydrodynamics) | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Southern Queensland |
Griffith University | |
University of Tabriz, Iran | |
Bureau Veritas, Australia |
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