PROBABILISTIC ASSESSMENT OF PRESTRESS LOSS IN PRETENSIONED PRESTRESSED CONCRETE

The effects of variability in the parameters used to calculate prestress loss are evaluated by a probabilistic prestress loss computer program. The program accounts for the time-dependent effects caused by creep, shrinkage, and steel relaxation. Losses caused by elastic shortening of the prestressed concrete member are also calculated. Statistical information for the parameters of the program is taken from the literature or from experimental results. Numerical examples show that the variability in the prestress losses exceeds the loss calculated by deterministic methods. This increase in prestress loss may then lead to stresses that exceed allowable stresses. Though the losses determined probabilistically can exceed deterministic losses by 50%, it is recommended that deterministic nominal losses be increased by only 25% when checking final stresses. This reasoning is based on the fact that allowable stresses also have variability. The study also determined that a normal distribution, with a bias of 1.25, models prestress losses fairly accurately.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/12789822
• Corporate Authors:

  Precast/Prestressed Concrete Institute

  209 West Jackson Boulevard
  Chicago, IL  United States  60606
• Authors:
  • Steinberg, E
• Publication Date: 1995-12

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 76-85
• Serial:
  • PCI Journal
  • Volume: 40
  • Issue Number: 6
  • Publisher: Precast/Prestressed Concrete Institute
  • ISSN: 0887-9672
  • Serial URL: http://www.pci.org

Subject/Index Terms

• TRT Terms: Creep; Deflection; Elastic analysis; Prestressing; Probability; Relaxation (Mechanics); Shrinkage; Structural analysis
• Uncontrolled Terms: Elastic stability; Prestress loss; Probabilistic analysis
• Subject Areas: Bridges and other structures; Data and Information Technology; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00716322
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 3 1996 12:00AM