Two cable-stayed bridges recently designed and built in Brazil present similar solutions for their deck cross-sections. The choice has been mainly oriented by a cost-efficiency balance criteria. In this paper, the results of wind tunnel analysis of section models of the two bridges are presented, with particular emphasis on the differences associated to the height-width aspect ratio. The main conclusions from the study were: (a) Brazilian standard parapets and new Jerseys were optimized for use in cable-stayed bridges; (b) Regarding the vortex shedding for both sections, the maximum response values for the first torsional and vertical modes were verified to be under the maximum admissible values obtained from usual design criteria. The section with the higher height-width ratio presented the worse response; and (c) The magnitude of the height-width ratio of the cross-section affects the response. For higher height-width ratio cross-section, the flutter critical velocity was smaller.
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