USE OF PRESTRESSED BARS FOR THE PRESTRESSING OF REINFORCED CONCRETE UNITS

BARRE PRECOMPRIMEE PERMETTANT LA MISE EN PRECONTRAINTE D'ELEMENTS EN BETON ARME

The prestressed bar is composed of a metal sheath (such as that used for post-tensioning) inside which are placed prestressing wires which bear, by adhesion, on the mortar or grout injected in the interior of the sheath and which possess a strength in excess of 50 mpa, before release of the wires. The high adhesion characteristics of the sheaths, internally and externally, are such that the reduction in the length of the grouting concrete due to the prestressing force, is transmitted to the sheath and to the additional concrete cast around the prestressed sheath. A prestressed concrete is thus obtained as a result of the creep of the prestressed bar. The simple manufacture of such bars makes it possible for the builder to construct reinforced concrete units, with a prestress which will retard the cracking and reduce deformation. The technology of site application is as simple as that of reinforced concrete and saves the contractor having to transport heavy prefabricated units to the site or having to prestress the as a whole. (TRRL) the length of the units, or having to set up a precasting bench on the site. The principle of analysis for a concrete unit reinforced with a prestressed bar is given.

  • Corporate Authors:

    Societe de Diffusion de Tech du Bat et de Trav Pub

    9 rue la Perouse
    Paris 16e,   France 
  • Authors:
    • Fuentes, A
  • Publication Date: 1978-3

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00314540
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 30 1980 12:00AM