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Research Papers: Structures and Safety Reliability

Fatigue Analysis of a Jacket Structure to Linear and Weakly Nonlinear Random Waves

[+] Author and Article Information
Naser Shabakhty

School of Civil Engineering,
Iran University of Science and Technology,
Tehran 16846-13114, Iran
e-mail: shabakhty@iust.ac.ir

Arash Khansari

Leichtweiss-Institute for Hydraulic Engineering and Water Resources,
Technische Universität Braunschweig,
Braunschweig D-38106, Germany
e-mail: akhansari@bbgeo.com

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the Journal of Offshore Mechanics and Arctic Engineering. Manuscript received June 29, 2018; final manuscript received February 18, 2019; published online March 25, 2019. Assoc. Editor: Amy Robertson.

J. Offshore Mech. Arct. Eng 141(6), 061602 (Mar 25, 2019) (11 pages) Paper No: OMAE-18-1077; doi: 10.1115/1.4042946 History: Received June 29, 2018; Accepted February 18, 2019

Jacket structures have been widely used in oil and gas industry and are increasingly becoming competitive as a support structure of wind turbines at different water depths. These types of structures usually fix in transition or shallow waters where numerous field observations and experiments have shown that water particles tend to exhibit non-Gaussian characteristics. However, current engineering practice ignores the wave nonlinearity for the analysis and design of these structures. The application of linear irregular models might result in considerable uncertainties in the obtained wave loads and consequently the dynamic response and thus it is highly questionable. Therefore, it is crucial to calculate the dynamic response of jacket structures under both linear and nonlinear wave models to investigate the validity of linear wave models in different sea states. In this paper, the finite element (FE) model of a jacket structure located in Persian Gulf (SP17 jacket) is setup and applied to perform a comparative study of the dynamic response to both linear and weakly nonlinear random waves. The fatigue life of the jacket structure is then calculated under both wave models. This paper will substantially improve the understanding of the dynamic response of jacket structures under fatigue damage.

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Figures

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Fig. 1

Sketch of the SP17 jacket structure: (a) front view and (b) side view

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Fig. 2

Generic view of the modelled SP17 jacket structure: (a) 3D side view and (b) top view

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Fig. 3

Linear and nonlinear water surface elevation (Hs = 8 m and Tz = 10 m)

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Fig. 4

Linear and nonlinear wave forces (Hs = 8 m and Tz = 10 s)

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Fig. 5

Wave force on the leg of the jacket structure for nonlinear waves (Hs = 8 m and Tz = 10 s)

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Fig. 6

Wave forces on the jacket leg among water depth in 194th second of wave simulation (Hs = 8 m and Tz = 10 s)

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Fig. 7

The probability density and cumulative distribution functions fitted to overturning moments caused by linear and nonlinear waves (Hs = 8 m and Tz = 10 s): (a) comparison of input PDF and normal (linear wave theory), (b) comparison of input CDF and normal (linear wave theory), (c) comparison of input PDF and logistic (nonlinear wave theory), and (d) comparison of input CDF and logistic (nonlinear wave theory)

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Fig. 8

Maximum overturning moment with 1% exceeding probability

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Fig. 9

Horizontal displacement: (a) pile head and (b) top-side due to wave forces based on linear and nonlinear models

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Fig. 10

Selected X and KT joints of the jacket structure

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Fig. 11

Superposition of the stresses in tubular joints of the jacket structure (modified from Ref. [29])

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Fig. 12

Hot spot stresses in connection of the tubular members

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Fig. 13

Methodology used for the calculation of fatigue life

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