Flexural Behavior of Reinforced Concrete Beams Containing Steel Fibers

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Title: Flexural Behavior of Reinforced Concrete Beams Containing Steel Fibers

Author(s): B. H. Oh, H. J. Lee, D. H. Lim, and S. K. Lee

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 987-1000

Keywords: beams (supports); compressive strength; crack width and spacing; fiber reinforced concrete; flexural strength; load deflection curve; metal fibers; reinforced concrete; splitting tensile strength; Structural Research

Date: 11/1/1991

Abstract:
Presents a study on the flexural behavior of reinforced concrete beams containing steel fibers. Several series of reinforced concrete beams have been tested. The present test program includes two series of singly reinforced concrete beams and one series of doubly reinforced concrete beams. The fiber contents for each series were varied from 0 to 2 percent by volume. The load was applied in flexure at the third-points. The deflections at the center- and quarter-points of the beam were measured, and the strains of concrete and steel at various points were also measured and automatically stored in the computer. The crack widths and crack spacings at each loading step were observed during the incremental loading process. The load-deflection curves were generated from the measured data. The present tests show that the crack widths increase almost linearly with the increase of steel stress and that the crack widths at the same loading steps are remarkably reduced as the fiber amounts increase. Fiber addition was found to improve considerably the ductility and load-carrying capacity of reinforced concrete members.