Part 1 of the report describes the current theoretical methods for evaluating the time-dependent strains in concrete. These are mainly due to creep and shrinkage in the concrete. The importance of this is in evaluating the long-term losses in pretension in prestressed concrete elements. Part 2 deals with the in-situ testing of large scale prestressed beams to assess their long term performance as regards prestress loss. The structures tested were fouur 30 mm long bridge beams at Basingstoke and the intergrid roof system of a school building at Bromley. These resulted in generally higher prestress losses than would be predicted by the various code methods. A major factor in the performance during demolition was the length over which the prestressing tendon debonded when it was cut. The implications of these results both on design of new structures and the demolition of existing ones, is discussed. (Author/TRRL)

  • Corporate Authors:

    University of Surrey

    Department of Civil Engineering
    Guildford, Surrey GU2 5XH,   United Kingdom 
  • Authors:
    • Buchner, S H
  • Publication Date: 1984-11

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 64 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00396965
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 25 2004 1:34AM