Assessment of Dynamic Effects of Wave Loads in Fatigue Analysis for Fixed Steel Offshore Structures

Dinh Quang Cuong, Bui The Anh


This paper presents an algorithm and develops a formula to evaluate the dynamic effect of wave loading on fixed steel offshore structures (jacket structures) through the fatigue damage ratio. Applying the algorithm and formula proposed in this paper to evaluate the dynamic effect of wave loads in fatigue analysis for 03 Jacket structures built at increasing water depth under one specific marine condition and provide specific recommendations on the limits of application of quasi-static and dynamic methods in the fatigue analysis of the jacket structures. This research is really necessary because currently, the current standards (API, DnV) only stop at evaluating the dynamic effects of wave loads acting on the Jacket structure in the strength analysis. These standards propose a limit for quasi-static or dynamic analysis based on the "3.0 s or 2.5 s rule" (use the quasi-static method when Tmax≤ 3.0 s or ≤ 2.5 s), and it is advised that they only apply to waters within the North Sea and the Gulf of Mexico. This paper has demonstrated that it is not appropriate to use the specified standards for the North Sea and the Gulf of Mexico to select the method of fatigue analysis of the jacket structure in marine conditions outside the study area of the standard. Hoped that this paper will be a reference for engineers when choosing a fatigue analysis method for jacket structures in specific marine conditions at the location where the jacket structure has been installed.


Doi: 10.28991/CEJ-2023-09-02-016

Full Text: PDF


Dynamic Effects, Wave Load, Fixed Steel Offshore Structure, Fatigue Analysis.


API-RP2A-WSD. (2014). Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms - Working Stress Design. American Petroleum Institute, Washington, United States.

ABS. (2020). Guide for Fatigue Assessment of Offshore Structures. American Bureau of Shipping, Houston, United States.

Khalifa, A. A., Aboul Haggag, S. Y., & Fayed, M. N. (2014). Fatigue assessment analysis of offshore structures with application to an existing platform in Suez Gulf, Egypt. World Applied Sciences Journal, 30(8), 1000–1019. doi:10.5829/idosi.wasj.2014.30.08.14126.

SACS Version (2018). Offshore structural analysis and design software, Executive Service Pack1, Version Bentley, Pennsylvania, United States.

Azarhoushang, A., & Nikraz, H. (2012). Dynamic fatigue assessment of fixed offshore platform. The Twenty-second International Offshore and Polar Engineering Conference, 1142–1147, 17-22 June, 2012, Rhodes, Greece.

Nallayarasu, S., Goswami, S., Manral, J. S., & Kotresh, R. M. (2010). Spectral Fatigue Analysis of Jacket Structures in Mumbai High Field. The International Journal of Ocean and Climate Systems, 1(3–4), 209–221. doi:10.1260/1759-3131.1.3-4.209.

Thomas, M., & Augustine, D. (2018). Fatigue analysis of offshore steel structures. International Research Journal of Engineering and Technology (IRJET), 5(4), 4693-4696.

Ali, A. A. M., & Kadim, J. A. Risks and Propsed Solutions for Dynamic Analysis of Offshore Structures”. International Journal of Scientific & Engineering Research, 8(7), 150–155.

Aeran, A., Siriwardane, S. C., Mikkelsen, O., & Langen, I. (2017). A framework to assess structural integrity of ageing offshore jacket structures for life extension. Marine Structures, 56, 237–259. doi:10.1016/j.marstruc.2017.08.002.

Kim, D.-H., Ahn, J.-W., Park, S.-G., Jun, S.-H., & Oh, Y.-T. (2015). Spectral Fatigue Analysis for Topside Structure of Offshore Floating Vessel. Journal of Advanced Research in Ocean Engineering, 1(4), 239–251. Doi:10.5574/jaroe.2015.1.4.239.

Siriwardane, S. C., Adasooriya, N. D., & Pavlou, D. (2021). Fatigue Strength Curve for Tubular Joints of Offshore Structures under Dynamic Loading. Dynamics, 1(1), 125–133. doi:10.3390/dynamics1010007.

Kim, D. H., & Lee, G. N. (2018). Fatigue life evaluation of offshore wind turbine support structure considering load uncertainty. The 2018 Structures Congress (Structures18), 27-31 August, 2018, Songdo Convesia, Incheon, Korea.

Damilola, O. J., Augustine, E. A., & Godspower, N. O. (2021). Fatigue Evaluation of Offshore Steel Structures Considering Stress Concentration Factor. International Journal of Research and Review, 8(10), 307–313. doi:10.52403/ijrr.20211041.

Barltrop, N. D., & Adams, A. J. (2013). Dynamics of fixed marine structures. Butterworth-Heinemann, Oxford, United Kingdom.

DNV-PR-C203. (2012). Fatigue Design of Offshore Steel Structures. Det Norske Veritas (DNV), Oslo, Norway.

Jagite, G., Bigot, F., Malenica, S., Derbanne, Q., Le Sourne, H., & Cartraud, P. (2022). Dynamic ultimate strength of a ultra-large container ship subjected to realistic loading scenarios. Marine Structures, 84, 103197. doi:10.1016/j.marstruc.2022.103197.

Dinh, Q.C., Bui, T.A., Hoang, D.N. (2019). Dynamic Effects of Wave Loads in Analysis to Check Strength and Fatigue for Fixed Steel Jacket Structure. Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering, Lecture Notes in Civil Engineering, 18. Springer, Singapore. doi:10.1007/978-981-13-2306-5_66.

Offshore Department - VR. (2017). The data set of Jacket structures has been approved and stored at the Vietnam Register. Vietnam Register, Hanoi, Vietnam.

FUGRO (2010). Block 01/97 and 02/97, Vietnam metocean criteria study (C50631/5751/R1). Fugro Geos, Oxfordshire, United Kingdom.

Full Text: PDF

DOI: 10.28991/CEJ-2023-09-02-016


  • There are currently no refbacks.

Copyright (c) 2023 Cuong Quang DINH, Anh The BUI

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.