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

Padmarajaiah, SK and Ramaswamy, Ananth (2004) Flexural strength predictions of steel fiber reinforced high-strength concrete in fully/partially prestressed beam specimens. In: Cement and Concrete Composites, 26 (4). pp. 275-290.

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Abstract

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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Flexural strength; Partial depth fibers; Load–deflection response; Moment–curvature relationship; Fully/partially prestressed beams; High-strength fiber concrete; Analytical models
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 16 Mar 2007
Last Modified: 19 Sep 2010 04:36
URI: http://eprints.iisc.ernet.in/id/eprint/10145

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