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Citation:
　Srinivasan Chandrasekaran,Ganta Shanmukha Rao.Postulated Tendon Failure of Offshore Triceratops[J].Journal of Marine Science and Application,2024,(1):182-200.[doi:10.1007/s11804-024-00397-3]
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Postulated Tendon Failure of Offshore Triceratops

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Title:
Postulated Tendon Failure of Offshore Triceratops
Author(s):
Srinivasan Chandrasekaran;  Ganta Shanmukha Rao
Affilations:
Author(s):
Srinivasan Chandrasekaran;  Ganta Shanmukha Rao
Department of Ocean Engineering, Indian Institute of Technology, Madras 600036, India
Keywords:
Ball joints|Tendons|Buoyant legs|Fatigue life|Irregular waves|Postulated failure
分类号:
-
DOI:
10.1007/s11804-024-00397-3
Abstract:
Offshore triceratops is one of the successful manifestations of the form-dominant design approaches deployable in ultra-deepwater oil and gas exploration. The deck’s geometric shape and partial isolation from the legs counteract lateral loads. Legs are position-restrained to the sea bed by taut-moored tendons, while ball joints partially isolate the deck from the buoyant legs. However, compliance in the horizontal plane imposes large displacements, intuiting the necessity to examine tendon failure. Numerical analysis of triceratops under wave and wind combined action is carried out under the postulated conditions of a tendon failure. 10-yr, 100-yr, and 1 000-yr post-Katrina hurricane conditions are assumed as loading to the platform. Results confirm a marginal increase in the natural periods of stiff degrees of freedom even under postulated failure conditions, ensuring good adaptability to ultra-deep water. Under postulated failure, the tension of adjacent tendons varies significantly, causing a shift to the mean position of the platform. Fatigue life is significantly reduced under the postulated failure of tendons, making the platform free-floating without affecting its stability. Results also show that the pitch response of the deck is a clear manifestation of the postulated failure, which is otherwise absent due to the presence of ball joints. The attempted study deliberates on the fatigue life of tendons, assessing the platform’s suitability to ultra-deep waters and identifying the vulnerable legs for the chosen load combinations.

References:

American Petroleum Institute (2010) Planning, designing and constructing tension leg platforms.API Recommended Practice 2
Chandrasekaran S, Madhuri S (2015) Dynamic response of offshore triceratops: numerical and experimental investigations.Ocean Engineering 109: 401-409.https://doi.org/10.1016/j.oceaneng.2015.09.042
Chandrasekaran S, Mayank S, Jain A (2015) Dynamic response behaviour of stiffened triceratops under regular waves: experimental investigations.International Conference on Offshore Mechanics and Arctic Engineering, Vol.56499, V003T02A083
Chandrasekaran S, Nagavinothini R (2018) Dynamic analyses and preliminary design of offshore triceratops in ultra-deep waters.Innovative Infrastructure Solutions 3(1): 16.https://doi.org/10.1007/s41062-017-0124-1
Chandrasekaran S, Nagavinothini R (2019) Ice-induced response of offshore triceratops.Ocean Engineering 180: 71-96.https://doi.org/10.1016/j.oceaneng.2019.03.063
Chandrasekaran S, Nannaware M (2014) Response analyses of offshore triceratops to seismic activities.Ships and Offshore Structures 9(6): 633-642.https://doi.org/10.1080/17445302.2013.843816
Chandrasekaran S, Rao MHVR (2019) Numerical analysis on triceratops restraining system: Failure conditions of tethers.Int.J.of Env.& Ecological Engg.13(9): 588-592.https://doi.org/10.5281/zenodo.3461996
Chandrasekaran S, Seeram M (2015) Dynamic response of offshore triceratops: Numerical and experimental investigations.Ocean Engineering 109: 401-409.http://dx.doi.org/10.1016/j.oceaneng.2015.09.042
Chandrasekaran S, Seeram M, Jain AK (2013) Aerodynamic response of offshore triceratops.Ships and Offshore Structures 8(2): 123-140.https://doi.org/10.1080/17445302.2012.691271
Chandrasekaran S, Shah B, Chauhan YJ (2022) Dynamic analyses of triceratops under Hurricane-driven Metocean conditions in Gulf of Mexico.Ocean Engineering 256: 111511.https://doi.org/10.1016/j.oceaneng.2022.111511
Chandrasekaran S, Uddin SA, Wahab M (2021) Dynamic analysis of semi-submersible under the postulated failure of restraining system with buoy.International Journal of Steel Structures 21(1): 118-131.https://doi.org/10.1007/s13296-020-00420-7
Chen M, Xiao P, Zhou H, Li CB, Zhang X (2022) Fully coupled analysis of an integrated floating wind-wave power generation platform in operational sea-states.Front.Energy Res.10: 931057.DOI: 10.3389/fenrg.2022.931057
Cheng S, Yu Y, Yu J, Wu J, Li Z, Huang Z (2021) Mechanistic research on the complex motion response of a TLP under tendon breakage.Ocean Engineering 240: 109984.https://doi.org/10.1016/j.oceaneng.2021.109984
DNV-GL (2005) Recommended Practice DNVGL-RP-0005, 2014-06 (April): 126.ftp://128.84.241.91/tmp/MSE-4020/Fatigue-DesignOffshore.pdf
Halkyard JE, Paulling JR, Davies RL, Glanvilie RS (1991) The tension buoyant tower: A design for deep water.Proceedings of the Annual Offshore Technology Conference, 41-55.https://doi.org/10.4043/6700-MS
Kim MH, Zhang Zhi (2009) Transient effects of tendon disconnection on the survivability of a TLP in moderate-strength hurricane condtions.International Journal of Naval Architecture and Ocean Engineering 1(1): 13-19.https://doi.org/10.2478/IJNAOE-2013-0002
Li Chunbao, Chen Mingsheng, Choung J (2021) The quasi-static response of moored floating structures based on minimization of mechanical energy.J.Marine Sc.and Engg.9(9): 960.https://doi.org/10.3390/jmse9090960
Liu Hanyu, Chen Mingsheng, Han Zhaolong, Zhou Hao, Li Lin (2022) Feasibility study of a novel open ocean aquaculture ship integrating with a wind turbine and an internal turret mooring system.J.Mar.Sci.Eng.10(11): 1729.https://doi.org/10.3390/jmse10111729
Nagavinothini R, Chandrasekaran S (2019) Dynamic analyses of offshore triceratops in ultra-deep waters under wind, wave, and current.Structures 20: 279-289.https://doi.org/10.1016/j.istruc.2019.04.009
Nagavinothini R, Chandrasekaran S (2020) Dynamic response of offshore triceratops with elliptical buoyant legs.Innovative Infrastructure Solutions 5(2): 1-14.https://doi.org/10.1007/s41062-020-00298-8
Perryman SR, Horton EE, Halkyard JE, Beynet PA (1995) Tension buoyant tower for small fields in deepwaters.Proceedings of the Annual Offshore Technology Conference, 13-22.https://doi.org/10.4043/7805-MS
Qi Y, Tian X, Guo X, Lu H, Liu L (2019) The hydrodynamic performance of a tension leg platform with one-tendon failure.Ships and Offshore Structures 14(5): 523-533.https://doi.org/10.1080/17445302.2018.1518188
Ren Yajun, Venugopal V, Shi Wei (2022) Dynamic analysis of a multi-column TLP floating offshore wind turbine with tendon failure scenarios.Ocean Engineering 245: 110472.https://doi.org/10.1016/j.oceaneng.2021.110472
Shaver CB, Capanoglu CC, Serrahn CS (2001) Buoyant leg structure preliminary design, constructed cost and model test results.Proceedings of the International Offshore and Polar Engineering Conference, 1: 432-439
Tabeshpour MR, Ahmadi A, Malayjerdi E (2018) Investigation of TLP behavior under tendon damage.Ocean Engineering 156: 580-595.https://doi.org/10.1016/j.oceaneng.2018.03.019
White CN, Copple RW, Capanoglu C (2005) Triceratops: An effective platform for developing oil and gas fields in deep and ultra deep water.Proceedings of the International Offshore and Polar Engineering Conference 2005, 133-339
Yang CK, Kim MH (2010) Transient effects of tendon disconnection of a TLP by hull-tendon-riser coupled dynamic analysis.Ocean Engineering 37(8-9): 667-677.https://doi.org/10.1016/j.oceaneng.2010.01.005
Yu J, Hao S, Yu Y, Chen B, Cheng S, Wu J (2019) Mooring analysis for a whole TLP with TTRs under tendon one-time failure and progressive failure.Ocean Engineering 182: 360-385.https://doi.org/10.1016/j.oceaneng.2019.04.049
Zhu Ling, Zou Meiyan, Chen Mingsheng, Li Lin (2021) Nonlinear dynamic analysis of float-over deck installation for a GBS platform based on a constant parameter time domain model.Ocean Engineering 235: 109443.https://doi.org/10.1016/j.oceaneng.2021.109443
Zou M, Chen M, Zhu L, Li L, Zhao W (2023) A constant parameter time domain model for dynamic modelling of multi-body system with strong hydrodynamic interactions.Ocean Engineering 268: 113376.https://doi.org/10.1016/j.oceaneng.2022.113376

Memo

Memo:
Received date:2023-03-14;Accepted date:2023-05-24。
Corresponding author:Srinivasan Chandrasekaran, E-mail: drsekaran@iitm.ac.in
Last Update: 2024-03-19