Dynamic analyses and preliminary design of offshore triceratops in ultra-deep waters

Chandrasekaran, Srinivasan; Nagavinothini, R.

doi:10.1007/s41062-017-0124-1

Cited by 19 publications

(3 citation statements)

References 13 publications

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“…The damping is calculated by using the logarithmic decrement method. The obtained natural periods and damping ratios of tethered triceratops are compared with [4]. The natural periods of flexible degrees of freedom are slightly more and stiff degrees of freedom are less due to the alignment of the tether configuration of the present study.…”

Section: Numerical Model Validationmentioning

confidence: 91%

“…The geometric details of the platform proposed by [4] are considered for the present study. The legs are modeled as tubular elements (Morison elements, D/L < 0.2) and their self-weight is computed by program control.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Buoyant legs are positioned and restrained by tethers, which are connected to the seabed. Ball joints transfer translational displacements to the deck from the legs and isolate the rotational displacements to the deck [4,5]. The different motion characteristics of structural members, such as buoyant legs and deck, uniqueness its structural behaviour under lateral loads [6].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic response of offshore triceratops under regular waves with tether postulated failure

Chandrasekaran¹,

Rao

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Triceratops are innovative offshore platforms that consist of a deck, three buoyant legs, and ball joints. Their deck is supported by buoyant legs, which, in turn, are restrained on the sea bed using taut-moored tubular tethers. Ball joints partially isolate the deck from the buoyant legs by restraining the transfer of rotations from the legs to the deck. Triceratops platforms exhibit a monolithic structural action in the vertical plane and a hybrid dynamic behavior resembling tension leg platforms and spar buoys. The present study investigates their dynamic response in regular waves. Response amplitude operators (RAOs) are estimated for intact and postulated failure conditions of the tethers. Based on detailed numerical investigations, it is seen that the pitch response of the deck increases significantly under the postulated failure of tethers, which are otherwise absent due to the presence of ball joints. Marginal change in surge response, even under tether failure, confirms the suitability of triceratops for ultra-deepwater installations. The fatigue life of tethers before and after postulated failure conditions is compared using the S-N curve approach and noticed that the adjacent tethers’ fatigue life reduces significantly under postulated failure conditions of tethers.

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Section: Numerical Model Validationmentioning

confidence: 91%

Section: Numerical Modelmentioning

confidence: 99%