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Volume 15 - Winter and Spring 2021                   ijmt 2021, 15 - Winter and Spring 2021: 119-129 | Back to browse issues page

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Sharifi S M H, Taheri A, Karimi Pur E. Structural Evaluation of Repair Methods on Dented Tubular Members Used in Jacket Platforms. ijmt 2021; 15 :119-129
URL: http://ijmt.ir/article-1-764-en.html
1- Mechanical Engineering Department, Petroleum University of Technology
Abstract:   (1996 Views)
Today, Iran's oil and gas industry requires maintenance, repair, renovation, and reconstruction methods for the existing platforms. It is essential to discuss the repair of offshore platforms since they mostly have been in service beyond their design lives and subjected to damages mentioned in the following. Furthermore, offshore platforms' increased number and service lives add to the need for the in-situ repair of offshore platforms. The most important reasons for the structural repair of offshore platforms include corrosion, fatigue, the collision of floating objects (e.g., vessels), the fall of heavy objects, and intensive storms. By considering the dent damage of platform members, which typically arise from the fall of heavy objects and the collision of floating objects, the present study investigates the damages resulting from such incidents during the operation of platforms and proposes the required repair methods. The repair methods include grouting, member replacement, mechanical clamps, and doubler plates. Once the experimental model of a dent-damaged member was validated, the repair methods were applied to the models, examining the strength of the members. The results indicated that the member strength reduced by up to nearly 40% at a dent depth as large as 0.3 of the member diameter (d=0.3D). However, the reduced strength could be compensated from 12% to about 125%, by applying the repair methods.
Full-Text [PDF 445 kb]   (477 Downloads)    
Type of Study: Research Paper | Subject: Offshore Structure
Received: 2021/08/30 | Accepted: 2021/10/30

1. C. S. Smith, W. L. Somerville, J. W. Swan, and others, "Residual strength and stiffness of damaged steel bracing members," 1981. [DOI:10.4043/3981-MS]
2. J. A. Padula, A. Ostapenko, and others, "A load-indentation relationship for tubular members," 1991. [DOI:10.4043/6651-MS]
3. J. Taby and T. Moan, "Collapse and residual strength of damaged tubular members," 1985.
4. J. R. MacIntyre, "An analytical study of damaged tubular member behaviour.," 1993.
5. L. Duan, J. T. Loh, and W.-F. Chen, "Moment-curvature relationships for dented tubular sections," Journal of Structural Engineering, vol. 119, no. 3, pp. 809-830, 1993. [DOI:10.1061/(ASCE)0733-9445(1993)119:3(809)]
6. C. P. Ellinas, "Ultimate strength of damaged tubular bracing members," Journal of Structural Engineering, vol. 110, no. 2, pp. 245-259, 1984. [DOI:10.1061/(ASCE)0733-9445(1984)110:2(245)]
7. J. M. Ricles, W. B. Lamport, T. E. Gillum, and others, "Residual strength of damaged offshore steel tubular bracing," 1992. [DOI:10.4043/6938-MS]
8. J. M. Ricles, T. E. Gillum, W. B. Lamport, and others, "Grout Repair of Dent-Damaged Steel Tubular Bracing," 1993. [DOI:10.4043/7151-MS]
9. J. K. Paik, J. M. Lee, and D. H. Lee, "Ultimate strength of dented steel plates under axial compressive loads," International Journal of Mechanical Sciences, vol. 45, no. 3, pp. 433-448, 2003. [DOI:10.1016/S0020-7403(03)00062-6]
10. S. Parsanejad, "Strength of grout-filled damaged tubular members," Journal of Structural Engineering, vol. 113, no. 3, pp. 590-603, 1987. [DOI:10.1061/(ASCE)0733-9445(1987)113:3(590)]
11. Y. Ueda and S. M. H. Rashed, "Behavior of damaged tubular structural members," 1985. [DOI:10.2534/jjasnaoe1968.1985.439]
12. Y. H. Mugahed Amran, R. Alyousef, R. S. M. Rashid, H. Alabduljabbar, and C.-C. Hung, "Properties and applications of FRP in strengthening RC structures: A review," Structures, vol. 16, pp. 208-238, Nov. 2018, doi: 10.1016/j.istruc.2018.09.008. [DOI:10.1016/j.istruc.2018.09.008]
13. H. Nassiraei and P. Rezadoost, "Stress concentration factors in tubular T/Y-joints strengthened with FRP subjected to compressive load in offshore structures," International Journal of Fatigue, vol. 140, p. 105719, Nov. 2020, doi: 10.1016/j.ijfatigue.2020.105719. [DOI:10.1016/j.ijfatigue.2020.105719]
14. A. Aeran, S. C. Siriwardane, O. Mikkelsen, and I. Langen, "A framework to assess structural integrity of ageing offshore jacket structures for life extension," Marine Structures, vol. 56, pp. 237-259, Nov. 2017, doi: 10.1016/j.marstruc.2017.08.002. [DOI:10.1016/j.marstruc.2017.08.002]
15. W. M. Bruin, "Assessment of the residual strength and repair of dent-damaged offshore platform bracing," 1995.
16. ASTM A572, "Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel," West Conshohocken, 2018.
17. Nassiraei, H. (2019). Static strength of tubular T/Y-joints reinforced with collar plates at fire induced elevated temperature. Marine Structures, 67, 102635. [DOI:10.1016/j.marstruc.2019.102635]
18. Nassiraei, H., Zhu, L., & Gu, C. (2021). Static capacity of collar plate reinforced tubular X-connections subjected to compressive loading: study of geometrical effects and parametric formulation. Ships and Offshore Structures, 16(1),54-69. [DOI:10.1080/17445302.2019.1708041]
19. Nassiraei, H., & Rezadoost, P. (2021). Static capacity of tubular X-joints reinforced with fiber reinforced polymer subjected to compressive load. Engineering Structures, 236, 112041. [DOI:10.1016/j.engstruct.2021.112041]

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