Title: Static and Fatigue Properties of Concrete Beams Reinforced with Continuous Bars and with Fibers

Author(s): H. A. Kormeling, H. W. Reinhardt, and S. P. Shah

Publication: Journal Proceedings

Volume: 77

Issue: 1

Appears on pages(s): 36-43

Keywords: beams (supports); cracking (fracturing); crack width and spacing; cyclic loads; deflection; dynamic loads; dynamic tests; fatigue (materials); fa-tigue tests; fiber reinforced concretes; loads (forces); metal fibers; reinforced concrete;research.

DOI: 10.14359/6989

Date: 1/1/1980

Abstract:
To study the influence of steel fibers on the fatigue behavior of conventionally reinforced concrete structures, beams reinforced with three different volumes of reinforcing bars were tested in a constant amplitude fatigue loading. For each amount of conventional steel, three types of fibers were used. Addition of fibers to conventionally reinforced concrete beams increased the static ultimate bending moment and the fatigue fife, and decreased, for a given static load and a given number of cycles, deflections and crack widths. The parameter pl/d (p = volume fraction, 1 = length, and d = diameter of fibers) adequately describes the various influences of fibers on the fatigue behavior of the reinforced concrete beams. The beneficial effects of fibers diminish at higher volume of reinforcing bars. Reinforced concrete beams subjected to a constant amplitude fatigue loading experience an increase in deflections, crack width, and average stresses in bars.