Ocean Systems Engineering

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Damage analysis of three-leg jacket platform due to ship collision

  • Received : 2023.10.19
  • Accepted : 2023.12.12
  • Published : 2023.12.25
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Abstract

A collision between a ship and an offshore platform may result in structural damage and closure; therefore, damage analysis is required to ensure the platform's integrity. This paper presents a damage assessment of a three-legged jacket platform subjected to ship collisions using the industrial finite element program Bentley SACS. This study considers two ships with displacements of 2,000 and 5,000 tons and forward speeds of 2 and 6.17 meters per second. Ship collision loads are applied as a simplified point load on the center of the platform's legs at inclinations of 1/7 and 1/8; diagonal bracing is also included. The jacket platform is modelled as beam elements, with the exception of the impacted jacket members, which are modelled as nonlinear shell elements with elasto-plastic material and constant isotropic hardening to provide realistic dented behavior due to ship collision load. The structural response is investigated, including kinetic energy transfer, stress distribution, and denting damage. The simulation results revealed that the difference in leg inclination has no effect on the level of localized denting damage. However, it was discovered that a leg with a greater inclination (1/8) resists structural displacement more effectively and absorbs less kinetic energy. In this instance, the three-legged platform collapses due to the absorption of 27.30 MJ of energy. These results provide crucial insights for enhancing offshore platform resilience and safety in high-traffic maritime regions, with implications for design and collision mitigation strategies.

Keywords

Acknowledgement

The authors gratefully acknowledge the financial support from Institut Teknologi Bandung for this work under research grants of Research, Community Service, and Innovation Program (P2MI).

References

  1. Amdahl, J. and Eberg, E. (1993), Ship Collision with Offshore Structure. Structural Dynamics - EURODYN.
  2. API, 2014. Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms-Working Stress Design, 22nd Ed., API Publishing Service, Washington D.C.
  3. DNVGL (2017), Recommended Practice C204 - Design against accidental loads. DNVGL, Oslo.
  4. Furnes, O. and Amdahl, J. (1980), Ship Collision with Offshore Structure. Presented at the Proceedings of the Intermaritec '80, Hamburg.
  5. Loughney, S., Wang, J. and Wall, A. (2020), Ship/Platform Collision Incident Database (2015) for offshore oil and gas installations. https://www.hse.gov.uk/research/rrhtm/rr1154.htm (accessed 2.20.22).
  6. Norsok (2017), NORSOK N-003: 2017: Actions and actions effects. Norsok Lysaker, Norway.
  7. Pacheco, L.A. and Durkin, S. (1988), "Denting and collapse of tubular members-A numerical and experimental study", Int. J. Mech. Sci., 30, 317-331. https://doi.org/10.1016/0020-7403(88)90104-X.
  8. Santoso, J.F., Tawekal, R.L., Arianta, A. and Ilman, E.C. (2023), "Numerical assesment of subsea pipeline capacity due to external circumferential semi-elliptical crack", Int. J. Geomate. 25(8).
  9. Sari, A., Ghoneim, A. and Ayhan, Y. (2013), "Design and assessment of offshore structures for extreme and Abnormal Accidental Loading", Presented at the Offshore Technology Conference, OnePetro. https://doi.org/10.4043/24084-MS
  10. Spouge, J. (1999), A Guide to Quantitative Risk Assesment for Offshore Installations. CMPT.
  11. Sterndorff, M.J., Waegter, J. and Eilersen, C. (1992), "Design of fixed offshore platforms to dynamic ship impact loads", J. Offshore Mech. Arct. Eng., 114, 146-153. https://doi.org/10.1115/1.2919966.
  12. Storheim, M. and Amdahl, J. (2014), "Design of offshore structures against accidental ship collisions", Mar. Struct., 37, 135-172. https://doi.org/10.1016/j.marstruc.2014.03.002.
  13. Tanujaya, V.A., Tawekal, R.L. and Ilman, E.C. (2022), "Vessel traffic geometric probability approaches with AIS data in active shipping lane for subsea pipeline quantitative risk assessment against third-party impact", Ocean Syst. Eng., 12(3), 267-284. https://doi.org/10.12989/ose.2022.12.3.267.
  14. Tawekal, R.L. and Iqbal, M. (2008), "Fatigue reliability index of jacket offshore platform based on fracture mechanics", Proceedings of the EASEC-11 - Eleventh East Asia-Pacific Conference on Structural Engineering and Construction.
  15. Tawekal, R.L., Prayudha, R. and Taufik, A. (2017), "Damage analysis of subsea pipeline due to anchor drag", 12, 5016-5021.
  16. Tore S. and Jorgen, A. (1983), Energy absorption in ship-platform impacts. https://doi.org/10.5169/seals32418 (accessed 6.19.23).