Fatigue Damage Analysis of Offshore Structures using Hot-Spot Stress and Notch Strain Approaches

Correia, M.; Calçada, Rui; Jesus, Abílio M. P. de; Lesiuk, Grzegorz; Castro, José Miguel; Correia, José A.F.O.; Mourão, António; Fantuzzi, Nicholas

doi:10.21741/9781644900215-21

Experimental Mechanics of Solids 2019

DOI: 10.21741/9781644900215-21

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Fatigue Damage Analysis of Offshore Structures using Hot-Spot Stress and Notch Strain Approaches

M. Correia

Rui Calçada

Abílio M. P. de Jesus

et al.

Abstract: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under license by Materials Research Forum LLC.

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Assessing Fatigue Damage in the Reuse of a Decommissioned Offshore Jacket Platform to Support a Wind Turbine

Heo

Liu

Manuel

et al. 2023

Journal of Offshore Mechanics and Arctic Engineering

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An offshore energy transition, even if only a gradual one, from carbon-emitting fossil fuel extraction to cleaner sources is recommended, if we are to slow the harmful impacts of climate change. The potential for sustainable reuse of decommissioned offshore jacket platforms to support wind turbines is being considered as an attractive proposition in such a transition. To maximize the benefits of such reuse of assets, what is needed is a rational optimization strategy that considers the remaining life of a repurposed platform, associated retrofit and construction costs, and a future period of gross renewable energy generation following installation of the wind turbine. We outline a study that employs a fatigue reliability-based framework, based on the global fatigue approach and Palmgren-Miner's rule, to aid in such sustainable reuse planning and optimization. The framework proposed identifies an optimized reuse plan that incorporates metocean data analysis, structural analysis, life-cycle evaluation, and revenue optimization. We employ a case study and sustainable reuse scenario for a site in the vicinity of Porto (Leixoes), Portugal.

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Assessing Fatigue Damage in the Reuse of a Decommissioned Offshore Jacket Platform to Support a Wind Turbine

Heo

Liu

Manuel

et al. 2023

Journal of Offshore Mechanics and Arctic Engineering

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A fatigue damage evaluation using local damage parameters for an offshore structure

Mourão

Correia

Ávila

et al. 2020

Proceedings of the Institution of Civil Engineers - Maritime En

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The fatigue design of offshore structures normally uses wave and wind fatigue loading. Currently, fatigue analyses for fatigue damage accumulation assessments of this type of structure are based on signal–noise (S–N) curves for welded structural components, the hot-spot stress approach and the Palmgren–Miner law – according to design codes. Fatigue analyses in design codes and/or recommended practices are supported by global structural analysis. In this paper, a global–local fatigue methodology applied to an offshore jacket-type platform using a local approach through the notch strain damage parameter is proposed. The local approach is based on Neuber's rule combined with the Ramberg–Osgood description. Then, the Coffin–Manson strain–life relation together with the Palmgren–Miner linear damage rule are used to evaluate the fatigue damage accumulation for the critical tubular welded joint. For application of Neuber's rule, the stress concentration factor values are calculated, according to Efthymiou's analytical equations, for the connection under consideration. The proposed methodology is compared with the simplified fatigue analysis presented in the Det Norske Veritas (Norway) and Germanischer Lloyd (Germany) DNVGL-RP-C203 recommendations. These analyses were performed using wave loads from the scatter diagram collected in the North Sea, which were computed through the fifth-order Stokes wave theory and the Morrison formula.

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Fatigue Damage Analysis of Offshore Structures using Hot-Spot Stress and Notch Strain Approaches

Abstract: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under license by Materials Research Forum LLC.

Cited by 2 publications

References 4 publications

Assessing Fatigue Damage in the Reuse of a Decommissioned Offshore Jacket Platform to Support a Wind Turbine

Assessing Fatigue Damage in the Reuse of a Decommissioned Offshore Jacket Platform to Support a Wind Turbine

A fatigue damage evaluation using local damage parameters for an offshore structure

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