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Structural performance assessment of fixed offshore platform based on in-place analysis

  • Raheem, Shehata E. Abdel (Civil Engineering Department, Faculty of Engineering, Assuit University) ;
  • Aal, Elsayed M. Abdel (Egypt Gas Company) ;
  • AbdelShafy, Aly G.A. (Civil Engineering Department, Faculty of Engineering, Assuit University) ;
  • Mansour, Mahmoud H. (Civil Engineering Department, Faculty of Engineering, Assuit University) ;
  • Omar, Mohamed (Civil Engineering Department, Faculty of Engineering, Aswan University)
  • 투고 : 2020.01.11
  • 심사 : 2020.08.31
  • 발행 : 2020.10.25

초록

In-place analysis for offshore platforms is essentially required to make proper design for new structures and true assessment for existing structures. The structural integrity of platform components under the maximum and minimum operating loads of environmental conditions is required for risk assessment and inspection plan development. In-place analyses have been executed to check that the structural member with all appurtenances robustness and capability to support the applied loads in either storm condition or operating condition. A nonlinear finite element analysis is adopted for the platform structure above the seabed and the pile-soil interaction to estimate the in-place behavior of a typical fixed offshore platform. The analysis includes interpretation of dynamic design parameters based on the available site-specific data, together with foundation design recommendations for in-place loading conditions. The SACS software is utilized to calculate the natural frequencies of the model and to obtain the response of platform joints according to in-place analysis then the stresses at selected members, as well as their nodal displacements. The directions of environmental loads and water depth variations have important effects on the results of the in-place analysis behavior. The result shows that the in-place analysis is quite crucial for safe design and operation of offshore platform and assessment for existing offshore structures.

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참고문헌

  1. Abdel Raheem, S. and Abdel Aal, E. (2013), "Finite element analysis for structural performance of offshore platforms under environmental loads", Key Eng. Mater., 569-570, 159-166. https://doi.org/10.4028/www.scientific.net/KEM.569-570.159.
  2. Abdel Raheem, S., Abdel Aal, S., Abdel Shafy, A. and Abdel Seed, F. (2012), "Nonlinear analysis of offshore structures under wave loadings", 15th World Conference on Earthquake Engineering, Paper No.3270.
  3. Abdel Raheem, S.E. (2013), "Nonlinear response of fixed jacket offshore platform under structural and wave loads", Coupl. Syst. Mech., 2, 111-126. https://doi.org/10.12989/csm.2013.2.1.111
  4. Abdel Raheem, S.E. (2015), "Nonlinear behavior of steel fixed offshore platform under environmental loads", Ship. Offshore Struct., 11(1), 1-15. https://doi.org/10.1080/17445302.2014.954301.
  5. Abdel Raheem, S.E., Abdel Aal, E., Abdel Shafy, A.G., Fahmy, M.F.M. and Mansour, M.H. (2020a), "Pile-soil-structure interaction effect on structural response of piled jacket-supported offshore platform through in-place analysis", Earthq. Struct., 18(4), 407-421. https://doi.org/10.12989/eas.2020.18.4.407.
  6. Abdel Raheem, S.E., Abdel Aal, E., Abdel Shafy, A.G., Fahmy, M.F.M., Omar, M. and Mansour, M.H. (2020b), "In-place analysis for design level assessment of fixed offshore platform", Ship. Offshore Struct., 1-12. https://doi.org/10.1080/17445302.2020.1787931.
  7. Abdel Raheem, S.E., Abdel Aal, E., Abdel Shafy, A.G., Fahmy, M.F.M., Omar, M. and Mansour, M.H. (2020c), "Numerical analysis for structure-pile-fluid-soil interaction model of fixed offshore platform", Ocean Syst. Eng., 10(3), 243-266. http://dx.doi.org/10.12989/ose.2020.10.3.243.
  8. Abdel Raheem, S.E., Abdel Zaher, A.K. and Taha, A.M. (2018), "Finite element modeling assumptions impact on seismic response demands of MRF-buildings", Earthq. Eng. Eng. Vib., 17(4), 821-834. https://doi.org/10.1007/s11803-018-0478-1.
  9. Ademovic, N. and Ibrahimbegovic, A. (2020), "Review of resilience-based design", Coupl. Syst. Mech., 9, 92-112. https://doi.org/10.12989/csm.2020.9.2.091.
  10. Aggarwal, R.K., Litton, R.W., Cornell, C.A., Tang, W.H., Chen, J.H. and Murff, J.D. (1996), "Development of pile foundation bias factors using observed behavior of platforms during Hurricane Andrew", Offshore Technology Conference, 445-455.
  11. AISC (American Institute of Steel Construction) (2005), Specification for Structural Steel Buildings, ANSI/AISC 360-05, American Institute of Steel Construction, Inc., Chicago.
  12. API (American Petroleum Institute) (1993), Recommended Practice - Load Resistance Factor Design for Design of Offshore Structures, API RP 2A-LRFD, 1st Edition, July, USA.
  13. API (American Petroleum Institute) (2010), Structural Integrity Management of Fixed Offshore Structures, API RP 2SIM, Offshore Technology Conference, May, Houston, Texas, USA.
  14. API (American Petroleum Institute) (2014), Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms -Working Stress Design, API RP-2A-WSD, 22nd Edition, Washington.
  15. Bea, R.G., Jin, Z., Valle, C. and Ramos, R. (1999), "Evaluation of reliability of platform pile foundations", J. Geotech. GeoEnviron. Eng., 125(8), 695-704. https://doi.org/10.1061/(ASCE)1090-0241(1999)125:8(696).
  16. Bentley Systems (2011), SACS Suite Program, Version 5.3, Bentley Systems, Exton, PA.
  17. Boujelben, A., Ibrahimbegovic, A. and Lefrancois, E. (2020), "An efficient computational model for fluid-structure interaction in application to large overall motion of wind turbine with flexible blades", Appl. Math. Model., 77, 392-407. https://doi.org/10.1016/j.apm.2019.07.033.
  18. Craig, M.J.K. and Digre, K.A. (1994), "Assessment of high-consequence platforms", Proceedings of Offshore Technology Conference, Houston, TX, October.
  19. Elsayed, T., El-Shaib, M. and Gbr, K. (2016), "Reliability of fixed offshore jacket platform against earthquake collapse", Ship. Offshore Struct., 11(2), 167-181. https://doi.org/10.1080/17445302.2014.969473.
  20. Elsayed, T., El-Shaib, M. and Holmas, T. (2015), "Earthquake vulnerability assessment of a mobile jackup platform in the Gulf of Suez", Ship. Offshore Struct., 10(6), 609-620. https://doi.org/10.1080/17445302.2014.942093.
  21. Gebara, J., Dolan, D., Pawsey, S., Jeanjean, P. and Dahl-Stamnes, K. (2000), "Assessment of offshore platforms under subsidence Part I: Approach", J. Offshore Mech. Arct. Eng., 122, 260-266. https://doi.org/10.1115/1.1313530.
  22. Golafshani, A.A., Tabeshpour, M.R. and Komachi, Y. (2009), "FEMA approaches in seismic assessment of jacket platforms (case study: Ressalat jacket of Persian Gulf)", J. Constr. Steel Res., 65, 1979-1986. https://doi.org/10.1016/j.jcsr.2009.06.005.
  23. Gudmestad, O.T. (2000), "Challenges in requalification and rehabilitation of offshore platforms. On the experience and developments of a Norwegian operator", J. Offshore Mech. Arct. Eng., 122(1), 3-6. https://doi.org/10.1016/j.jcsr.2009.06.005.
  24. Guede, F. (2019), "Risk-based structural integrity management for offshore jacket platforms", Marine Struct., 63, 444-461. https://doi.org/10.1016/j.marstruc.2018.04.004.
  25. Hajdo, E., Ibrahimbegovic, A. and Dolarevic, S. (2020), "Buckling analysis of complex structures with refined model built of frame and shell finite elements", Coupl. Syst. Mech., 9, 29-46. https://doi.org/10.12989/csm.2020.9.1.029.
  26. Haritos, N. (2007), "Introduction to the analysis and design of offshore structures-an overview", Electron J. Struct. Eng., Special Issue: Load. Struct. Melbourne Univ., 7, 55- 65.
  27. Henry, Z., Jusoh, I. and Ayob, A. (2017), "Structural integrity analysis of fixed offshore jacket structures", J. Mekanikal, 40, 23-36.
  28. Ibrahimbegovic, A., Kassiotis, C. and Niekamp, R. (2016), "Fluid-structure interaction problems solution by operator split methods and efficient software development by code-coupling", Coupl. Syst. Mech., 5(2), 145-156. http://dx.doi.org/10.12989/csm.2016.5.2.145.
  29. Ishwarya, S., Arockiasamy, M. and Senthil, R. (2016), "Inelastic nonlinear pushover analysis of fixed jacket-Type offshore platform with different bracing systems considering soil-structure interaction", J. Ship. Ocean Eng., 6, 241-254. http://dx.doi.org/10.17265/2159-5879/2016.04.006.
  30. Kassiotis, C., Ibrahimbegovic, A., Niekamp, R. and Matthies, H. (2011b), "Partitioned solution to nonlinear fluid-structure interaction problems. Part II: CTL based software implementation with nested parallelization", Comput. Mech., 47, 335-357. https://doi.org/10.1007/s00466-010-0544-7
  31. Kassiotis, C., Ibrahimbegovic, A., Niekamp, R. and Matthies, H. (2011a), "Partitioned solution to nonlinear fluid-structure interaction problems. Part I: implicit coupling algorithms and stability proof", Comput. Mech., 47, 305-323. https://doi.org/10.1007/s00466-010-0545-6
  32. Khandelwal, D. (2018), "Design/analysis procedures for fixed offshore platform jacket structures", Int. J. Adv. Eng. Res. Develop., 5(3), 292-298.
  33. Krieger, W.F., Banon, H., Lloyd, J.R., De, R.S., Digre, K.A. and Nair, D. (1994), "Process for assessment of existing platforms to determine their fitness for purpose", Proceedings of Offshore Technology Conference, Houston, TX, October.
  34. Malley, J.O. (2007), "The 2005 AISC seismic provisions for structural steel buildings", Eng. J. Am. Inst. Steel Constr., 44, 3-14.
  35. Nour El-Din, M. and Kim, J.K. (2015), "Seismic performance of pile-founded fixed jacket platforms with chevron braces", Struct. Infrastr. Eng., 11, 776-795. https://doi.org/10.1080/15732479.2014.910536.
  36. Petrauskas, C., Finnigan, T.D., Heideman, J.C., Vogel, M., Santala, M. and Berek, G.P. (1994), "Metocean criteria/loads for use in assessment of existing offshore platforms", Proceedings of Offshore Technology Conference, TX, October.
  37. Sadian, R. and Taheri, A. (2016), "In-place strength evaluation of existing fixed offshore platform located in Persian Gulf with consideration of soil-pile interactions", 18th Marine Industries Conference (MIC2016), Kish Island, October.
  38. Sadian, R. and Taheri, A. (2017), "In-place strength evaluation of existing fixed offshore platform located in Persian Gulf with consideration of soil-pile interactions", Int. J. Coast. Offshore Eng., 1(1), 35-42 https://doi.org/10.12962/j2580-0914.v1i1.2876
  39. Scheu, M.N., Tremps, L., Smolka, U., Kolios, A. and Brennan, F. (2019). "A systematic failure mode effects and criticality analysis for offshore wind turbine systems towards integrated condition-based maintenance strategies", Ocean Eng., 176(5), 118-133. https://doi.org/10.1016/j.oceaneng.2019.02.048.