Flexural strength predictions of steel fiber reinforced high-strength concrete in fully/partially prestressed beam specimens

This study presents results from an experimental program for eight fully prestressed beams and seven partially prestressed beams made with high strength fiber-reinforced concrete (plain concrete strength of 65 MPa). These studies mainly attempted to determine the influence of trough-shaped steel fibers in altering the flexural strength at first crack and ultimate, the load-deflection and moment-curvature characteristics, ductility and energy absorption capacity of the beams. The magnitude of the prestress, volume fraction of the fibers ranging from 0% to 1.5% and the location of fibers were the variables in the test program. Analytical models to determine the load-deflection and moment-curvature relationships as a function of the fiber volume fraction have been formulated. Empirical relationships for the ultimate strength, first crack load level, load versus deflection and moment versus curvature as a function of fiber content have been proposed by making use of force equilibrium and compatibility considerations. A primary finding emerging from the experimental program was that the placement of fibers over a partial depth in the tensile side of the prestressed flexural structural members provided equivalent flexural capacity as in a beam having the same amount of fiber over the full cross-section. In large scale precast concrete applications it is expected that this would be economical and lead to considerable cost saving in the design without sacrificing on the desired structural performance. The analytical models proposed in this study predicts the test results closely. (A) "Reprinted with permission from Elsevier".

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09589465
• Authors:
  • PADMARAJAIAH, S K
  • RAMASWAMY, A
• Publication Date: 2004-5

Language

• English

Media Info

• Pagination: 275-90
• Serial:
  • Cement and Concrete Composites
  • Volume: 26
  • Issue Number: 4
  • Publisher: Elsevier
  • ISSN: 0958-9465

Subject/Index Terms

• TRT Terms: Beams; Concrete; High performance concrete; Reinforced concrete; Steel; Strength of materials
• ITRD Terms: 3472: Beam; 4755: Concrete; 4783: High performance concrete; 4794: Reinforced concrete; 4542: Steel; 5544: Strength (mater)
• Subject Areas: Materials; I32: Concrete;

Filing Info

• Accession Number: 01012379
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Dec 20 2005 3:27PM