Prestress Losses in Pretenstioned Girders Part I: Method Development

Prestress loss estimation is required for properly assessing concrete stresses and members deformation. Earlier methods of prestress loss prediction were based on relatively low concrete strength. Their use for high strength concrete can produce significant errors due to their inability to accommodate varying material properties. Another source of error for earlier methods is that they do not adequately address the interaction between precast concrete members and cat-in-place composite topping. This paper presents the results of the research work conducted by Tadros et al in the National Cooperative Highway Research Program (NCHRP) 18-07 study on prestress losses in high strength concrete which have been adopted by the American Association of State highway and Transportation Officials, Load and Resistance Factor Design, AASHTO LRFD Specifications for inclusion in the 2005 edition. This paper consists of two parts. Part I describes the development of the new methods that are applicable to conventional and high strength concrete ranging from 4 to 15 ksi (28 to 103 MPa). Part II deals with the experimental program and comparison of measured versus prestress losses.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References;
  • Pagination: pp 439-460
  • Monograph Title: Seventh International Symposium on the Utilization of High Strength/High-Performance Concrete
  • Serial:
    • Volume: 1 & 2

Subject/Index Terms

Filing Info

  • Accession Number: 01004572
  • Record Type: Publication
  • ISBN: 0870311808
  • Files: TRIS
  • Created Date: Sep 30 2005 12:40PM