Stress Concentration Factor Evaluation of Offshore Tubular KT Joints Based on Analytical and Numerical Solutions: Comparative Study
Publication: Practice Periodical on Structural Design and Construction
Volume 26, Issue 4
Abstract
Fatigue damage is treacherous and can lead to the failure of offshore structures. The purpose of this research is to evaluate and discuss the stress concentration factor (SCF) values for two geometries of offshore tubular KT joints using different calculation methods to be used in fatigue design. The work was done by using analytical calculations, formulations from the literature, and numerical solutions, finite-element method (FEM) analysis using commerically available software, supported by international standard recommendations. For the analytical formulations, geometrical parameters were used as defined in standard recommendations. For the numerical model, two different geometries of tubular KT joints are presented where different shell (S4R), solid (C3D8R), and solid with weld (C3D8R) element-type models were built in the software environment. After considering 23 different types of loading conditions, a comparison between the standard SCF and finite-element analysis (FEA) SCF values for the critical load case has been performed. The results have shown that the values of SCF from the standard are more conservative than SCF from FEA. However, FEA SCF values for the solid and solid with weld element types have shown little differences.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. List of available data, models or code:
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data within tables,
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data within figures,
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input finite-element models, and
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Python codes for data extraction.
Acknowledgments
This research was supported by the project grant (UTA-EXPL/IET/0111/2019) SOS-WindEnergy—Sustainable Reuse of Decommissioned Offshore Jacket Platforms for Offshore Wind Energy by national funds (PIDDAC) through the Portuguese Science Foundation (FCT/MCTES); and base funding UIDB/04708/2020 and programmatic funding UIDP/04708/2020 of the CONSTRUCT—Instituto de I&D em Estruturas e Construções, funded by national funds through the FCT/MCTES (PIDDAC). The authors would also like to thank all support by UT Austin Portugal Programme. The support of Fondazione Flaminia (Ravenna, Italy) is gratefully acknowledged.
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Published In
Practice Periodical on Structural Design and Construction
Volume 26 • Issue 4 • November 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 24, 2021
Accepted: Jun 21, 2021
Published online: Sep 8, 2021
Published in print: Nov 1, 2021
Discussion open until: Feb 8, 2022
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