Shear Capacity of Steel Fiber High-Strength Concrete Beams

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Title: Shear Capacity of Steel Fiber High-Strength Concrete Beams

Author(s): M. Imama Vamdewalle, and F. Mortelmans

Publication: Special Publication

Volume: 149

Issue:

Appears on pages(s): 227-242

Keywords: beams (supports); bending; compressive strength; fibers (discrete fibers); high-strength concretes; shear properties; splitting tensile strength; web reinforcement; Structural Research

Date: 10/1/1994

Abstract:
Sixteen very high strength concrete beams (3600 x 350 x 200 mm) with and without steel fibers were tested under different combinations of shear force and bending moment. The beams were singly reinforced and without shear (web) reinforcement. The cylinder compressive strength of concrete was about 110 MPa. The main variables in this program were: shear span/depth ratio (a/d), the steel fiber content (V f), and the percentage of the longitudinal flexural reinforcement ({rho}). The test results showed that, adding steel fibers to high-strength concrete increased the ultimate shear strength, increased the stiffness, reduced the deflection, and transformed the failure mode into a more ductile one. Based on the test results, two empirical expressions have been proposed to predict the shear strength of steel fiber high-strength concrete.