Advanced Analysis and Optimization of Tubular Joints in Marine Structures for Offshore Renewable Energy Applications

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (30 July 2025) | Viewed by 1327

Special Issue Editors


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Guest Editor
1. Civil Engineering and Georesources Department, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
2. CIIMAR—Interdisciplinary Centre of Marine and Environmental Research, Marine Energy and Hydraulic Structures, 4450-208 Matosinhos, Portugal
Interests: coastal structures; physical modelling; coastal management; coastal dynamics; sea energy
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Special Issue Information

Dear Colleagues,

The Special Issue, titled “Advanced Analysis and Optimization of Tubular Joints in Marine Structures for Offshore Renewable Energy Applications”, invites innovative scientific contributions focusing on the design, analysis, and optimization of tubular joints in marine structures. This includes research on enhancing the structural integrity, fatigue performance, and hydrodynamic behavior of offshore platforms, wind turbines, and other renewable energy installations. This Special Issue also welcomes studies on numerical modeling, experimental investigations, advanced computational techniques, and new materials that contribute to the efficiency and durability of offshore structures.

A key focus of this Special Issue is the analysis and optimization of tubular joints in marine structures and strengthening methods, such as Fiber-Reinforced Polymer (FRP) composites, concrete encasement, and other reinforcement techniques, to improve the load-bearing capacity and longevity of tubular joints in harsh marine environments. Studies exploring hybrid strengthening approaches, retrofitting strategies, and innovative material applications to mitigate corrosion, fatigue, and structural degradation are highly encouraged. Additionally, this Special Issue encourages research on probabilistic and reliability-based analysis for offshore structural components. Topics such as risk assessment, uncertainty quantification, stochastic modeling, and reliability optimization in the design and maintenance of tubular joints are of particular interest. Contributions that integrate Bayesian methods, Monte Carlo simulations, and reliability-based design optimization (RBDO) to enhance the safety and performance of offshore renewable energy structures are also welcome.

This Special Issue also welcomes research integrating cutting-edge technologies, such as artificial intelligence, machine learning, and digital twins, to improve the predictive capabilities of structural assessments. Contributions addressing real-world challenges, including extreme environmental conditions, corrosion, and long-term reliability, are particularly welcome.

Furthermore, the Special Issue strongly encourages submissions from young researchers and experts from diverse geographical regions, fostering global collaboration for advancing offshore renewable energy solutions.

Prof. Dr. Francisco Taveira Pinto
Dr. Paulo Jorge Rosa-Santos
Guest Editors

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Keywords

  • marine structures
  • tubular joints
  • hydrostatic and hydrodynamic analysis
  • renewable energy
  • probabilistic and reliability analysis
  • strengthening methods (e.g., ring, FRP, concrete)
  • offshore wind energy structures
  • floating and fixed wind turbine structures
  • design practices for marine structures
  • dynamics analysis
  • environmental loads (e.g., wind, wave, marine growth, current)
  • numerical and experimental methods for marine structures
  • transportation and installation of offshore structures
  • cost analysis of marine structures
  • mooring design and analysis of marine structures
  • optimization of marine structures

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Published Papers (1 paper)

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Research

20 pages, 5168 KB  
Article
Shape Optimization and Fatigue Analysis of the Bracket in the Jacking Frame of a Wind Turbine Installation Vessel
by Guanyi Gao, Shumei Chen, Guoqing Feng and Kaiyan Li
J. Mar. Sci. Eng. 2025, 13(11), 2069; https://doi.org/10.3390/jmse13112069 - 30 Oct 2025
Viewed by 830
Abstract
As offshore wind power continues to extend into deeper waters, the operational environment has expanded from shallow to deep seas. Self-elevating and self-propelled installation vessels have been widely adopted due to their jack-up systems and self-propulsion capabilities. The structural integrity of wind turbine [...] Read more.
As offshore wind power continues to extend into deeper waters, the operational environment has expanded from shallow to deep seas. Self-elevating and self-propelled installation vessels have been widely adopted due to their jack-up systems and self-propulsion capabilities. The structural integrity of wind turbine installation vessels is crucial to ensure successful operations, among which the strength of the jacking frame is particularly critical. This study focuses on the bracket made of E550 steel at the root of the jacking frame. Shape optimization of the bracket was performed using parametric modeling technology, resulting in a 26% reduction in peak stress and a 12% decrease in bracket mass. Following the optimization, a full-scale fatigue test targeting local fatigue hot spots of the bracket was carried out. Based on the experimental data, the fatigue S-N curve of the bracket was obtained. Finally, a fatigue assessment was conducted on the high-stress region at the toe of the bracket. The results indicate that the bracket with unequal arm lengths exhibits lower stress concentration. Fatigue cracks of the bracket initiate at the weld toe, and the fatigue strength of the E550 steel toe joint obtained from the test is superior to that of the D-curve specified in the standards. Based on the derived S–N curve, a spectral fatigue analysis was further carried out to verify the fatigue performance of the optimized bracket. The total fatigue damage of the optimized structure over a 20-year design life was calculated as 0.6, which is below the allowable limit of 1.0, demonstrating that the optimized design satisfies the fatigue safety requirements. Full article
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