Optimal layout of gill cells for very large floating structures

Pham, D. C. and Wang, C. M. (2010) Optimal layout of gill cells for very large floating structures. Journal of Structural Engineering, 136 7: 907-916. doi:10.1061/(ASCE)ST.1943-541X.0000182


Author Pham, D. C.
Wang, C. M.
Title Optimal layout of gill cells for very large floating structures
Journal name Journal of Structural Engineering   Check publisher's open access policy
ISSN 0733-9445
1943-541X
Publication date 2010-07-01
Year available 2010
Sub-type Article (original research)
DOI 10.1061/(ASCE)ST.1943-541X.0000182
Open Access Status Not yet assessed
Volume 136
Issue 7
Start page 907
End page 916
Total pages 10
Place of publication Reston, VA, United States
Publisher American Society of Civil Engineers
Language eng
Abstract A pontoon-type, very large floating structure (VLFS) undergoes uneven deformation when loaded unevenly. The resulting differential deflection may lead to a cessation of equipment operation, and even compromising the structural integrity of the VLFS. One cost effective solution for reducing the differential deflection is by introducing the innovative gill cells at appropriate locations in the VLFS. Gill cells are compartments in VLFS with holes or slits at their bottom surfaces to allow water to enter or leave freely. At these gill cell locations, the buoyancy forces are eliminated and this allows uneven buoyancy forces acting at the bottom hull of the VLFS to somewhat counterbalance the applied nonuniform loading. In this paper, we investigate the effectiveness of gill cells in pontoon-type VLFS in reducing the differential deflection and von Mises stresses as well as the optimal layout (i.e., the number and locations) of gill cells that minimizes the differential deflection subject to a draft constraint. As the decision variables, objective functions and the constraints are not continuous and differentiable, genetic algorithms are adopted as an optimization tool. The optimal layouts for gill cells are determined for various VLFS shapes such as square, rectangular and I-shape and loading configurations.
Keyword Algorithms
Differential deflection
Finite element method
Gill cell
Optimization
Very large floating structures
Von Mises stress
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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