These specifications were drafted in 1957 from laboratory test results and in-situ observation of the behaviour of wires post-tensioned according to the bbrv method. The mechanical characteristics of prestressing wires can be improved by various treatments; but these improvements are not all beneficial in the utilization of the steel. The selection of the wires to be used for the bbrv prestressing method is done according to specific criteria, some of which are based on the stress/strain chart of the steel. The tensile strength of the wire must be between 155 and 180 kg/sq mm. The relation between the elastic limit at 0.2% and tensile strength must be between 0.75 and 0.90. Elongation after failure, measured on a base equal to 10 x diameter of the wire, must be greater than 4%. Details are also given of the way of connecting wires, constriction and folding strength of the wire at delivery and of notched wires. The quality of connections is tested in situ by means of simple tensile tests. This specification has been translated into french and is available at lcpc as traduction 72.T.5. /TRRL/

  • Corporate Authors:

    Brandestini - Birkenmayer - Rost

    Asylstrasse 58
    Zurich,   Switzerland 
  • Authors:
    • Ros, M R
  • Publication Date: 1957-11

Media Info

  • Features: Figures;
  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00099612
  • Record Type: Publication
  • Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
  • Report/Paper Numbers: Standard
  • Files: ITRD, TRIS
  • Created Date: Nov 18 1975 12:00AM