Structural assessment of the hull response of an fpso unit to dropped objects: a case study

• Autorzy: Ozguc Ozgur

Identyfikatory

DOI

10.2478/pomr-2019-0064

• Języki publikacji: EN

Abstrakty

EN

Offshore structures are exposed to the risk of damage caused by various types of extreme and accidental events, such as fire, explosion, collision, and dropped objects. These events cause structural damage in the impact area, including yielding of materials, local buckling, and in some cases local failure and penetration. The structural response of an FPSO hull subjected to events involving dropped objects is investigated in this study, and non-linear finite element analyses are carried out using an explicit dynamic code written LS-DYNA software. The scenarios involving dropped objects are based on the impact from the fall of a container and rigid mechanical equipment. Impact analyses of the dropped objects demonstrated that even though some structural members were permanently deformed by drop loads, no failure took place in accordance with the plastic strain criteria, as per NORSOK standards. The findings and insights derived from the present study may be informative in the safe design of floating offshore structures.

Słowa kluczowe

EN

drop object; hull response; impact analysis; offshore structures

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2019
• Tom: nr 4
• Strony: 39--46
• Opis fizyczny: Bibliogr. 16 poz., rys., tab.

Twórcy

autor

Ozguc Ozgur

• Istanbul Technical University, Dept. of Naval Architecture and Ocean Eng., Maslak, 34469 Istanbul, Turkey

Bibliografia

• 1. Ahn K., Chun M., Han S., Jang K., Suh Y. (2014): Dropped Object Analysis Using Non-linear Dynamic FE Analysis. 33rd International Conference on Ocean, Offshore and Arctic Engineering, Volume 4A, Structures, Safety and Reliability, San Francisco, California, USA.
• 2. Alsos H.S., Amdahl J. (2009): On the Resistance to Penetration of Stiffened Plates, Part I - Experiments. International Journal of Impact Engineering, Vol. 36, No. 6, 799-807.
• 3. Bergstad A. (2014): Assessment of Hull Response Due to Impact from Falling Object, MSc thesis, Department of Marine Technology, Norwegian University of Science and Technology, Norway.
• 4. DNV GL-RP-C204 (2018): Design Against Accidental Loads. Recommended Practice, Hovik, Det Norske Veritas, Norway.
• 5. DNV GL-RP-C208 (2018): Determination of Structural Capacity by Non-linear FE Analysis Methods. Recommended Practice, Hovik, Det Norske Veritas, Norway.
• 6. DNV GL-OS-A101 (2019): Safety Principles and Arrangements. Hovik, Det Norske Veritas, Norway.
• 7. DNV GL-OS-C102 (2019): Structural Design of Offshore Ship-Shaped Units. Hovik, Det Norske Veritas, Norway.
• 8. DNV GL Rules for Classification. (2019): Hull Structural Design Ships with Length 100 Meters and Above. Part 3, Chapter 1.
• 9. Ehlers S. (2010): Strain and Stress Relation until Fracture for Finite Element Simulations of a Thin Circular Plate. Thin-Walled Structures, Vol. 48, No. 1, 1-8.
• 10. Ingve N. (2014): Dropped Object Protection Analyses, Master’s thesis, University of Stavanger, Norway.
• 11. Jung B.G., Jo S.W., Paik J.K., Seo J.K., Kim Y.H. (2016): Experimental and Numerical Studies on Non-linear Impact Response of Deck Structures Subjected to Dropped Objects. 35th International Conference on Ocean, Offshore and Arctic Engineering, Vol. 3, Structures, Safety and Reliability, Busan, South Korea.
• 12. Moan T. (2009): Development of Accidental Collapse Limit State Criteria for Offshore Structures. Structural Safety, Vol. 31, 124-135.
• 13. NORSOK Standard (2004): Design of Steel Structures, N-004, Rev. 2.
• 14. Sun L.P., Ma G, Nie C.Y., Wang Z.H. (2011): The Simulation of Dropped Objects on the Offshore Structure. Advanced Materials Research, Vol. 339, 553-556.
• 15. Paik J.K. (2007): Practical Techniques for Finite Element Modeling to Simulate Structural Crashworthiness in Ship Collisions and Grounding (Part I: Theory). Ships and Offshore Structures, Vol. 2, No. 1, pp. 69-80.
• 16. Zhang S. (1999): The Mechanics of Ship Collision, PhD Thesis, Lyngby, Technical University of Denmark.