Effects of stiffness and configuration of brace-viscous damper systems on the response mitigation of offshore jacket platforms

Vaezi, Mostafa; Pourzangbar, Ali; Fadavi, Manouchehr; Mousavi, Seyyed Mahmoud; Sabbahfar, Peyman; Brocchini, Maurizio

doi:10.1016/j.apor.2020.102482

Cited by 22 publications

(4 citation statements)

References 22 publications

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“…They considered the influence of a porous shell on the platform motion response and hydrodynamic coefficients and found improvements in the motion characteristics in the heave degree of freedom (DOF) due to the porous shells. Vaezi et al (2021) effectively inhibited the motion of the conduit rack-type platform using viscous dampers. Jiang et al developed a spar-type floating wind turbine, namely SJTU-S4, for medium to shallow water depths.…”

Section: Article Highlightsmentioning

confidence: 99%

Integrated System of Semi-submersible Offshore Wind Turbine Foundation and Porous Shells

Yao,

Mayon,

Zhou

et al. 2024

J. Marine. Sci. Appl.

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A novel semi-submersible platform is proposed for 5 MW wind turbines. This concept focuses on an integrated system formed by combining porous shells with a semi-submersible platform. A coupled aerodynamic–hydrodynamic–mooring analysis of the new system is performed. The motion responses of the novel platform system and the traditional platform are compared. The differences in hydrodynamic performance between the two platforms are also evaluated. The influence of the geometric parameters (porosity, diameter, and wall thickness) of porous shells on the motion response behavior of the new system is studied. Overall, the new semi-submersible platform exhibits superior stability in terms of pitch and heave degrees of freedom, demonstrating minimal effects on the motion response in the surge degree of freedom.

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Section: Article Highlightsmentioning

confidence: 99%

Integrated System of Semi-submersible Offshore Wind Turbine Foundation and Porous Shells

Yao,

Mayon,

Zhou

et al. 2024

J. Marine. Sci. Appl.

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“…Ayotunde et al 30 assessed the correctness of high-power energy storage technologies for offshore platforms from an LCC point of view. Vaezi et al 31 investigated first the effects of a specific structural system on the dynamic response of offshore platforms and then proposed an optimization framework to be employed in the design of marine structures under applied loads. Qi et al 32 developed a time-dependent corrosion model for mobile offshore platforms.…”

Section: Introductionmentioning

confidence: 99%

A probabilistic approach to lifetime design of offshore platforms

Hajinezhadian

Behnam

2023

Sci Rep

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Offshore platforms are considered critical infrastructure as any disruption in their lifetime service can rapidly result in a great loss to arise. While these structures are often designed for their initial construction cost, it is worth considering a lifetime-based design so that both direct and indirect costs are involved in the design process. Here, a probabilistic-based approach to life-cycle-cost (LCC) analysis of offshore platforms is proposed. A fixed offshore platform is designed first based on the current design regulations and for a 100-year return period. For the effect of LCC on design optimization, the simultaneous effect of the wave, current, and wind merging are probabilistically considered. The structural elements are designed for five different models; one model based on the current design requirements and the rest for more than the requirements. The LCC of each model is accordingly determined. The results show that the code-based model is not optimal when is compared with a lifetime cost period; it is necessary to increase the size of structural elements by up to 10% to meet an optimum point. Results show that with a 5% increase in the initial cost, a decrease in the LCC up to about 46% is observed. The work presented here is to stimulate stakeholders to promote the LCC-based design of important structures to reduce lifetime costs.

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“…These dampers work to reduce the dynamic response of offshore platforms. In addition, an energy dissipation system, also known as an EDS, might be an efficient way to eliminate expensive structural repair operations and strengthen components when they are subjected to loads from the ocean [5], [6].…”

Section: Introductionmentioning

confidence: 99%

“…In a separate piece of research, the authors [7] compared the performance of a jacket platform with and without viscous dampers and looked into the various conventional configurations of dampers to determine which one provided the best results. The researchers Vaezi et al [6] investigated the effect of three types of different configurations of brace-viscous damper systems (chevron, toggle, and diagonal) in the mitigation of offshore structure response. They demonstrated that designing the proper arrangement of dampers could change the effectiveness of the dampers.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Brace-Viscous Damper System of Fixed Offshore Jacket Platforms Under Extreme Environmental Loads

A. Alwashali,

Chin

2023

IJIE

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The Persian Gulf is one of the most common regions where offshore platforms exist due to the presence of oil and natural gas.Wind, current, and wave loading affect the dynamic response of offshore structures, increasing performance uncertainty and catastrophic failure probability. Thus, this study investigates energy dissipation systems, particularly viscous dampers, to solve design and rehabilitation problems of fixed offshore structures. Viscos dampers improve vibrational behaviour and reduce structural response to optimise platform performance. Thus, eliminating costly structural repairs and strengthening components under extreme environmental loads extends structure lifetime. Thus, different viscous damper system configurations are tested to reduce dynamic response under extreme environmental loads in the Persian Gulf. Diagonal and inverted V-shaped brace viscous dampers with ninedifferent arrangements are compared to find the best configuration. The study found that the brace viscous dampers with only three applied dampers at the top three levels are most efficient at mitigating dynamic response. It reduced displacements from level 1 to level 5 by 52% to 64% and connection stresses by 38% to 54%. Finally, viscous dampers reduce structural vibration and provide uniform and constant structural dynamic response, so the oil and gas industry should use them for offshore structure design and rehabilitation.

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Effects of stiffness and configuration of brace-viscous damper systems on the response mitigation of offshore jacket platforms

Cited by 22 publications

References 22 publications

Integrated System of Semi-submersible Offshore Wind Turbine Foundation and Porous Shells

Integrated System of Semi-submersible Offshore Wind Turbine Foundation and Porous Shells

A probabilistic approach to lifetime design of offshore platforms

A Numerical Study of Brace-Viscous Damper System of Fixed Offshore Jacket Platforms Under Extreme Environmental Loads

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