Optimization Of Cable-stayed Bridges With Box- -girder Decks
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Simoes, L.M.C. and Negrao, J.H.J.O.
Box-girder decks are very effective solutions for long span cable-stayed bridges, due to its high torsional stiffness and streamlined profile, which usually leads to a good aerodynamic behaviour. A study on the optimization of such structural system is presented in this paper. The deck is modelled through the assembly of planes of plate-membrane elements. A multicriteria approach is considered for the optimization itself, with constraints on maximum stresses, minimum stresses in stays and deflections under dead load condition. Two illustrative examples are shown. 1 Introduction Cable-stayed bridges are large and sophisticated structures which may greatly benefit from the use of Structural Optimization techniques for preliminary design improvement. General optimization packages are not