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From a decrease of web thickness to a reinforcement optimization

 From a decrease of web thickness to a reinforcement optimization
Auteur(s): , ,
Présenté pendant IABSE Symposium: Tomorrow’s Megastructures, Nantes, France, 19-21 September 2018, publié dans , pp. S5-79
DOI: 10.2749/nantes.2018.s5-79
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A New Coastal Road (NRL) almost completely situated at sea over a length of 12,5 km will allow the inhabitants of the Reunion Island, in the Indian Ocean, to connect quickly and in complete safety ...
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Détails bibliographiques

Auteur(s): (Vinci Construction Grands Projets, Rueil-Malmaison, France)
(Vinci Construction Grands Projets, Rueil-Malmaison, France)
(Demathieu-Bard, Le Port, France)
Médium: papier de conférence
Langue(s): anglais
Conférence: IABSE Symposium: Tomorrow’s Megastructures, Nantes, France, 19-21 September 2018
Publié dans:
Page(s): S5-79 Nombre total de pages (du PDF): 7
Page(s): S5-79
Nombre total de pages (du PDF): 7
DOI: 10.2749/nantes.2018.s5-79
Abstrait:

A New Coastal Road (NRL) almost completely situated at sea over a length of 12,5 km will allow the inhabitants of the Reunion Island, in the Indian Ocean, to connect quickly and in complete safety Saint-Denis, the capital city located in the East, with its commercial harbor situated about twenty kilometers further west, without interruption due to massive rock falls from the cliff on the 4 lanes current coast road.

Each span of variable depth of the 5,4km viaduct is 120 m long. The cross section is a mono- cellular box girder with two webs and post tensioned overhang. The 28m wide segments of decks were proposed with a web thickness reduction in regards to the tender layout. The alternative removed the transverse ribs, to simplify the segments prefabrication.

The decrease of the web thickness was a challenge for the JV in order to prove to the client that the reinforcement and prestressing will not increase consequently. Therefore, a detailed analysis using the variable strut inclination method and specific behaviour of a precast deck allowed to keep web reinforcement in current ratios.

Mots-clé:
tablier ferraillage