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Modelling of the Long Term Behaviour of Prestressed Concrete Structures: the Case of Nuclear Power Plants.

 Modelling of the Long Term Behaviour of Prestressed Concrete Structures: the Case of Nuclear Power Plants.
Auteur(s): ,
Présenté pendant IABSE Symposium: Tomorrow’s Megastructures, Nantes, France, 19-21 September 2018, publié dans , pp. S3-77
DOI: 10.2749/nantes.2018.s3-77
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The prediction of the long term behaviour of prestressed concrete structures is important in order to assess and/or extend the service life of such structures. In the case of nuclear power plants (...
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Détails bibliographiques

Auteur(s): (Université Paris-Est, MAST, IFSTTAR, F-77447 Marne-la-Vallée, France)
(Université Paris-Est, Laboratoire Navier (UMR 8205), CNRS, Ecole des Ponts ParisTech, IFSTTAR, F- 77455 Marne-la-Vallée, France)
Médium: papier de conférence
Langue(s): anglais
Conférence: IABSE Symposium: Tomorrow’s Megastructures, Nantes, France, 19-21 September 2018
Publié dans:
Page(s): S3-77 Nombre total de pages (du PDF): 8
Page(s): S3-77
Nombre total de pages (du PDF): 8
DOI: 10.2749/nantes.2018.s3-77
Abstrait:

The prediction of the long term behaviour of prestressed concrete structures is important in order to assess and/or extend the service life of such structures. In the case of nuclear power plants (NPPs) where the internal vessel is a biaxially prestressed structure, the prediction of the delayed deformations is also a safety concern. Indeed, in these structures, the prestressing is there to avoid tensile stresses and cracking in case of a severe accident where internal pressure and temperature could be generated. An experimental mock-up of a reactor containment building at 1/3 scale has been built near Paris by EDF in order to follow the evolution of the delayed strains and of leak tightness of the containment under aging. This mock-up named VeRCoRs (VErification Réaliste du COnfinement des RéacteurS) is highly instrumented so that its behaviour is monitored from the beginning of the construction. In this paper a modelling of the delayed strains (creep and shrinkage of concrete and relaxation of steel) based on the MC2010 is used to predict the behaviour of the mock-up. This modelling takes into account the influence of the temperature and of the relative humidity (varying under service conditions). Finally, the predicted delayed strains are compared with the measurements.

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