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Structural Engineering and Mechanics
  Volume 35, Number 5, July30 2010 , pages 539-554

Optimum design of FRP box-girder bridges
Akhil Upadhyay and V. Kalyanaraman

    Light weight superstructure is beneficial for bridges in remote areas and in emergency erection. In such weight sensitive applications, combination of fibre reinforced plastics (FRP) as material and box-girders as a structural system have great scope. This combination offers various options to tailor structure and its elements but this flexibility poses greater challenge in optimum design. In this paper a procedure is derived for a generalised optimum design of FRP box-girder bridges, using genetic algorithms (GA). The formulation of the optimum design problem in the form of objective function and constraints is presented. Size, configuration and topology optimization are done simultaneously. A few optimum design studies are carried out to check the performance of the developed procedure and to get trends in the optimum design which will be helpful to the new designers.
Key Words
    box-girder; FRP; bridge; optimum design; genetic algorithms.
Akhil Upadhyay: Department of Civil Engineering, IIT Roorkee, Roorkee 247667, India
V. Kalyanaraman: Department of Civil Engineering, IIT Madras, Chennai 600036, India

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