For this span range (70-90 m), as recent studies have proven, 1 the spanby-span construction also ensures important advantages such as continuity of the deck and a significant optimization of material consumption (in particular that of prestressing steel) because the construction stage may be almost neutral to the deck design.Until the last few years, bridges with 70 to 90 m span were typically constructed by precast solutions, metallic solutions or cantilever method. 2
Until 2016, the in situ, span-by-span, prestressed concrete deck construction of multi-span bridges was limited to spans up to 78 m. This construction method, in some cases, ensures verifiable advantages in terms of construction simplicity and reduction in material consumption. After scientific and technical validation of the organic prestressing technology application in movable scaffolding systems in 2005, and evaluation of its potential features, a long-term multidisciplinary research and development project was developed to evaluate the possibility of using this technology for in situ construction of multi-span decks with spans up to 90 m. In 2018, in Turkey, the first viaduct using this technology anywhere in the world was completed. In the present paper, following a presentation of prior scientific and technological achievements, the main technical data of this case study are given, highlighting its results. This technological achievement is a contribution to the state of the art of bridge engineering and to sustainability.
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