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Optimization of orthotropic girders in cable supported bridges by parametric studies

 Optimization of orthotropic girders in cable supported bridges by parametric studies
Auteur(s): ORCID, , ,
Présenté pendant IABSE Congress: The Evolving Metropolis, New York, NY, USA, 4-6 September 2019, publié dans , pp. 963-968
DOI: 10.2749/newyork.2019.0963
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For the last six decades closed-box orthotropic steel girders have been widely used in cable supported bridges due to their simple but useful structural concepts. Several numerical parametric studi...
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Détails bibliographiques

Auteur(s): ORCID (Department of Civil Engineering, Technical University of Denmark; Department of Major Bridges International, COWI A/S)
(Department of Civil Engineering, Technical University of Denmark)
(Department of Civil Engineering, Technical University of Denmark)
(Department of Major Bridges International, COWI A/S)
Médium: papier de conférence
Langue(s): anglais
Conférence: IABSE Congress: The Evolving Metropolis, New York, NY, USA, 4-6 September 2019
Publié dans:
Page(s): 963-968 Nombre total de pages (du PDF): 6
Page(s): 963-968
Nombre total de pages (du PDF): 6
DOI: 10.2749/newyork.2019.0963
Abstrait:

For the last six decades closed-box orthotropic steel girders have been widely used in cable supported bridges due to their simple but useful structural concepts. Several numerical parametric studies were previously carried out in order to investigate inherent fatigue stress problems and in general, to improve the bridge girder designs. However, often such studies have been carried out with over-simplified finite element models, especially where boundary conditions have been challenging. In the present work, an advanced multi-scale FE model of a suspension bridge is established with sophisticated boundary conditions applied to a local parametric sub-model of a bridge girder. Thus, the model accommodates realistic support conditions. With this sub-model, a parametric study of the usual design parameters is carried out with focus on fatigue and a Eurocode stiffness requirement. The study reveals trends and correlations for the varying design parameters. Finally, the parametric sub-model is utilized in an automatic gradient-based optimization of multiple design variables simultaneously with the goal of minimizing weight. The methods allow bridge engineers to push material utilization to its limits by giving new insight into the effect of changing design parameters.