Optimal layout of gill cells for very large floating structures / D. C. Pham in Journal of structural engineering, Vol. 136 N° 7 (Juillet 2010)  

Public ISBD [article]  inJournal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 907-916 Titre : Optimal layout of gill cells for very large floating structures Type de document : texte imprimé Auteurs : D. C. Pham, Auteur ; C. M. Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 907-916 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Differential deflection von Mises stress Very large floating structures Gill cell Optimization Algorithms Finite element method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : 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. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p907_s1?isAuthorized=no [article] Optimal layout of gill cells for very large floating structures [texte imprimé] / D. C. Pham, Auteur ; C. M. Wang, Auteur . - 2011 . - pp. 907-916. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 907-916 Mots-clés : Differential deflection von Mises stress Very large floating structures Gill cell Optimization Algorithms Finite element method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : 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. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p907_s1?isAuthorized=no

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