Overall cost optimization of prestressed concrete bridge using genetic algorithm
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Overall cost optimization of Prestressed Concrete (PC) bridges is investigated in this study. The purpose of this study is to determine the optimum span number and optimum cross-sectional properties of multi-span bridges. Considered bridge superstructure is constituted by adjacent simply supported pretensioned prestressed I-girders. Also, considered bridge substructure is constituted by single-column piers and rectangular spread footings. Span number, cross-section dimensions of prestressed girders and the area of Prestressing Steel (PS) are considered as design variables. PC girders, piers and footings are designed according to AASHTO Standard Specifications for Highway Bridges. A modified hybrid Genetic Algorithm (GA) is used for the optimum design. Working stress, ultimate strength, ductility limits, deflection, and geometry constraints are considered. Total cost of the bridge is taken as optimality criterion. A computer program is coded to perform optimum design and numerical examples from the application are designed. One of these examples is used in this paper. It is concluded that GA can be effectively used in the overall cost optimization of PC bridges.
Keywordsprestressed concrete genetic algorithm optimization bridge
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- AASHTO (2002). Standard specifications for highway bridges, American Association of State Highway and Transportation Officials, Washington, D.C.Google Scholar
- Aydın, Z. (2006). Optimum design of prestressed concrete bridge girders using genetic algorithm, PhD Thesis, Karadeniz Technical University, Turkey.Google Scholar
- Ayvaz, Y. and Aydın, Z. (2000). “Optimum design of trusses using a genetic algorithm.” Proceedings of the Second International Conference on Engineering using Metaphors from Nature, Leuven, Belgium, pp. 159–168.Google Scholar
- Daloğlu, A. and Aydın, Z. (1999). “Kafes sistemlerin uygulamaya yönelik optimum tasarımı.” Mühendislik Bilimleri Dergisi, Vol. 5, No. 1, pp. 951–957 (in Turkish).Google Scholar
- Emay International Eng. Cons. Co. (1998). Uzunçay r baraj varyant yolu dinar köprüsü uygulama projesi hesaplar, stanbul (in Turkish).Google Scholar
- Holland, J. H. (1975). Adaptation in natural and artificial systems, University of Michigan Press, Ann Arbor, Mich.Google Scholar
- Lounis, Z. and Cohn, M.Z. (1993). “Optimization of precast prestressed concrete bridge girder systems.” PCI J., Vol. 38, No. 4, pp. 60–78.Google Scholar
- Totres, G. G. B., Brotchie, J. F., and Cornell, C. A. (1966). “A program for the optimum design of prestressed concrete highway bridges.” PCI J., Vol. 11, No. 3, pp. 63–71.Google Scholar