In this work, the implementation of reliability-based optimization (RBO) of a circular steel monopod-offshore-tower with constant and variable diameters (represented by segmentations) and thicknesses is presented. The tower is subjected to the extreme wave loading. For this purpose, the deterministic optimization of the tower is performed with constraints including stress, buckling, and the lowest natural frequency firstly. Then, a reliability-based optimization of the tower is performed. The reliability index is calculated from FORM using a limit state function based on the lowest natural frequency. The mass of the tower is considered as being the objective function; the thickness and diameter of the cross-section of the tower are taken as being design variables of the optimization. The numerical strategy employed for performing the optimization uses the IMSL-Libraries routine that is based on the Sequential Quadratic Programming (SQP). In addition, to check the results obtained from aforementioned procedure, the RBO of the tower is also performed using the genetic algorithms (GA) tool of the MATLAB. Finally, a demonstration of an example monopod tower is presented.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4819-7
PROCEEDINGS PAPER
Reliability Based Optimization of Steel Monopod Offshore-Towers Available to Purchase
H. Karadeniz,
H. Karadeniz
Delft University of Technology, Delft, The Netherlands
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V. Togan,
V. Togan
Karadeniz Technical University, Trabzon, Turkey
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T. Vrouwenvelder
T. Vrouwenvelder
Delft University of Technology, Delft, The Netherlands
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H. Karadeniz
Delft University of Technology, Delft, The Netherlands
V. Togan
Karadeniz Technical University, Trabzon, Turkey
T. Vrouwenvelder
Delft University of Technology, Delft, The Netherlands
Paper No:
OMAE2008-57174, pp. 185-195; 11 pages
Published Online:
July 27, 2009
Citation
Karadeniz, H, Togan, V, & Vrouwenvelder, T. "Reliability Based Optimization of Steel Monopod Offshore-Towers." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 2: Structures, Safety and Reliability. Estoril, Portugal. June 15–20, 2008. pp. 185-195. ASME. https://doi.org/10.1115/OMAE2008-57174
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