Burdet, OlivierBadoux, Marc2007-09-122007-09-122007-09-122000https://infoscience.epfl.ch/handle/20.500.14299/12016The paper presents an analytical comparison of the amount of prestressing required for two similar bridges, one with internal and the other with external prestressing. This comparison shows that bridges with external prestressing can become economically competitive for large girder depths. The detrimental effect of the smaller stress in the prestressing steel at the ultimate limit state is more than compensated by the thinner webs made possible by the absence of the ducts.précontrainte sans adhérenceperte de précontcisaillementflexural strengthbalancementdurabilitéprestressed concreteprestress levelprécontrainte extérieureacierbeam and slab bridgeshear strengthcomportement statiqueshearprécontrainte injectéebéton arméarmature minimaleallongement des câbles à la rupturecâblerésistance à l'effort tranchantsteelrésistance à la flexionstructural safetycablefissurationoptimizationoptimisationfailure by elongation of cablesancragebridgedurabilitypontsécurité structuraleexternal prestressinganalytic modelEurocodeTheory of structuresprestress lossreinforced concretemodèle analytiquepont poutrestructural behaviourinjected prestressinganchorageunbounded prestressinganalyse des structuresbéton précontraintminimum reinforcementperte de précontraintecrack growthtext::conference output::conference proceedings::conference paper