Shear Behavior of High-Strength Fiber Reinforced Concrete Beams

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Title: Shear Behavior of High-Strength Fiber Reinforced Concrete Beams

Author(s): Samir A. Ashour, GhaziI S. Hasanain, and Faisal F. Wafa

Publication: Structural Journal

Volume: 89

Issue: 2

Appears on pages(s): 176-184

Keywords: beams (supports); compressive strength; cracking (fracturing); deflection; diagonal tension; fiber reinforced concretes; metal fibers; high-strength concretes; shear strength; span-depth ratio; Structural Research

Date: 3/1/1992

Abstract:
Presents test results of 18 rectangular high-strength fiber reinforced concrete beams subjected to combined flexure and shear. All beams were singly reinforced and without shear reinforcement. The main variables were the steel fiber content, the longitudinal steel ratio, and the shear-span/depth ratio. The concrete matrix compressive strength was about 93 MPa (13,000 psi) containing only one type of fiber. Two empirical equations are proposed to predict the shear strength of high-strength fiber reinforced concrete beams without shear reinforcement. The proposed equations gave good predictions for the shear strength of the tested beams. Addition of fibers increased the beam stiffness and ductility, depending upon the shear-span/depth ratio and transformed the mode of failure into a more ductile one.