New Developments in Brazilian Cable Stayed Bridges

摘要

In the last decade in Brazil the development of the infrastructural network and the presence of largernrivers led to the construction of many new bridges, the larger of which are cable stayed structures.rnAt the same time the urban development of many towns required the construction of new overpassrnstructures that, in some cases, were the occasion of creating a landscape mark, and qualifying new andrnold areas.rnThis paper refers on some of these bridges, designed by the author and recently built, showing how thernenvironmental constraints affected - in a quite different way - their design, and how the relationshiprnbetween the bridge layout, that is its form, and the structural system were at the base of some designrndecisions. The main span of the three major bridges ranges from 200 to 320m; structures are prestressedrnconcrete and, in two cases, composite steel concrete construction.rnA discussion on the adopted construction systems and materials, as well as on durability andrnsustainability issues is also presented.rnNew bridges under design and construction will illustrate the more recent developments.