Structural Engineering and Mechanics

  • 제16권3호
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  • Pages.317-326
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  • 2003
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Reliability of TLP tethers under extreme tensions

  • Siddiqui, N.A. (Department of Civil Engineering, Aligarh Muslim University) ;
  • Ahmad, Suhail (Department of Applied Mechanics, Indian Institute of Technology)
  • 투고 : 2002.11.21
  • 심사 : 2003.07.02
  • 발행 : 2003.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

The tension leg platform (TLP) is a moored floating offshore structure whose buoyancy is more than its weight. The mooring system, known as tethers, is vulnerable to failure due to extreme (maximum and minimum) tensions. In the present study the reliability of these tethers under maximum and minimum tension (ultimate limit state) has been studied. Von-Mises failure criteria has been adopted to define the failure of a tether against maximum tension. The minimum tension failure criteria has been assumed to meet when the tethers slack due to loss of tension. First Order Reliability method (FORM) has been adopted for reliability assessment. The reliability, in terms of reliability index, and probability of failure has been obtained for twelve sea states. The probabilities of failure so obtained for different sea states have been adopted for the calculation of annual and life time probabilities of failure.

키워드

참고문헌

  1. Ahmad, S. (1996), "Stochastic TLP response under long crested random sea", Comput. Struct., 61(6), 975-993. https://doi.org/10.1016/0045-7949(96)00188-5
  2. Banon, H. and Harding, S.J. (1989), "A methodology for assessing the reliability of TLP tethers under maximumand minimum lifetime loads", Proc. of 5th Int. Conf. on Structural Safety and Reliability (ICOSSAR'89), 182-190.
  3. Banon, H., Cornell, C.A. and Harding, S.J. (1991), "Probabilistic combination of forces in tension leg platformtethers", J. Struct. Eng., ASCE, 117(5), 1532-1548. https://doi.org/10.1061/(ASCE)0733-9445(1991)117:5(1532)
  4. Faunkler, D., Birrell, N.D. and Stiansen, S.G. (1983), "Development of reliability based design code for thestructure of tension leg platforms", Proc. Offshore Technology Conference(OTC), 575-586.
  5. Karadeniz, H., Vrouwenvelder, A. and Bouma, A.L. (1983), "Stochastic fatigue reliability analysis of jacket typeoffshore structures", Reliability Theory and Its Applications in Structural and Soil Mechanics (editor - P. ThoftChritensen ), NATO Scientific Affairs Division.
  6. Lotsberg, I. (1991), "Probabilistic design of the tethers of a tension leg platform", J. Off-shore Mechanics andArctic Engineering., 113, 162-169. https://doi.org/10.1115/1.2919913
  7. Mathinsen, J. and Bitner-Gregersen, E. (1990), "Joint distributions for significant wave height and wave zero-upcrossingperiod", Applied Ocean Research.
  8. Oran, C. (1992), "Asymptotic analysis of TLP tendons and risers", J. Engng. Mech., ASCE, 118(1), 56-73. https://doi.org/10.1061/(ASCE)0733-9399(1992)118:1(56)
  9. Sengupta, B. and Ahmad, S. (1996), "Reliability assessment of tension leg platform tethers under nonlinearlycoupled loading", Reliability Engineering and System Safety, 53, 47-60. https://doi.org/10.1016/0951-8320(96)00016-6
  10. Siddiqui, N.A. and Ahmad, S. (2000) "Reliability analysis against progressive failure of TLP tethers in extremetension", Reliability Engineering and System Safety, 68, 195-205. https://doi.org/10.1016/S0951-8320(00)00008-9
  11. Siddiqui, N.A and Ahmad, S. (2001), "Fatigue and fracture reliability of TLP tethers under random loads,"Marine Structures, June 2001, 14(3), 331-352. https://doi.org/10.1016/S0951-8339(01)00005-3

피인용 문헌

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  2. Reliability considerations in bridge pier scouring vol.28, pp.1, 2008, https://doi.org/10.12989/sem.2008.28.1.001
  3. A new design concept for ocean nuclear power plants using tension leg platform vol.76, pp.3, 2003, https://doi.org/10.12989/sem.2020.76.3.367