Shear Behavior of Slender and Non-Slender Steel Fiber- Reinforced Concrete Beams

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Title: Shear Behavior of Slender and Non-Slender Steel Fiber- Reinforced Concrete Beams

Author(s): Sahith Gali and Kolluru V. L. Subramaniam

Publication: Structural Journal

Volume: 116

Issue: 3

Appears on pages(s): 149-158

Keywords: dilatancy; flexure; shear; shear capacity; shear crack; steel fiber-reinforced concrete

Date: 5/1/2019

Abstract:
Steel fiber-reinforced concrete (SFRC) beams without shear reinforcement are tested at shear span-depth ratios (a/d) equal to 1.80, 2.25, and 3.0. Cracking behavior up to the peak load is evaluated and the critical shear crack is identified from the full-field measurements on the surface of the beam obtained using digital image correlation (DIC). The in-place movements across the shear crack show a dilatant behavior with a continuous increase in the crack opening and slip across the crack faces. The critical shear crack is formed at the location of the highest applied moment-to-shear ratio in the shear span. At the peak load, there is an increase in the moment to shear ratio (Mu/(Vud)) at the critical shear crack with an increase in shear slenderness. Dilatancy across the shear crack increases with an increase in the slenderness due to the increased contribution of flexure to crack opening. While there is an increase in shear capacity with the addition of fibers, the efficiency of the fibers in increasing shear capacity decreases with an increase in the Mu/(Vud) at the critical shear crack.