LONG-TERM TENSION-STIFFENING EFFECTS IN CONCRETE

For many types of construction, such as balanced cantilever, incremental launch, or even in-place on formwork, the time-dependent effects have to be included within the structural analysis by the designer, both in terms of stresses and deformations. This article reports on a study that investigated long-term tension-stiffening effects in beams and slabs by a comprehensive series of laboratory tests. Three load levels and three concrete strengths were used and loads were sustained for periods of up to 4 months. Some specimens contained strain-gauged reinforcing bars to obtain very detailed data concerning reinforcement strain distributions. The results indicated that tension-stiffening decayed much more rapidly than was previously thought, and that by 20 days, or sooner, after loading, it had reduced to its long-term value. The authors conclude by discussing the implications of their results on the current design rules for deflection control.

  • Availability:
  • Supplemental Notes:
    • For this issue of the ACI Structural Journal, the date is January/February 2005.
  • Corporate Authors:

    American Concrete Institute (ACI)

    38800 Country Club Drive
    Farmington Hills, MI  United States  48331
  • Authors:
    • Scott, R H
    • Beeby, A W
  • Publication Date: 2005-1

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00985146
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 2005 12:00AM