Title:
Punching Shear Strength of Steel Fiber Reinforced Concrete Flat Plates
Author(s):
A. M. Shaaban and H. Gesund
Publication:
Structural Journal
Volume:
91
Issue:
4
Appears on pages(s):
406-414
Keywords:
concretes; fibers; punching shear; splitting tensile strength; tensile strength; Structural Research
DOI:
10.14359/4145
Date:
7/1/1994
Abstract:
The primary objective of this experimental study was to determine whether addition of steel fibers to the concrete mix could significantly increase the punching shear strength of reinforced concrete slabs. Thirteen slab specimens and their companion cylinder specimens were tested. Fiber concentrations in the slabs ranged from 0 to 6.4 percent by weight of concrete. Test results of this study indicate that the addition of steel fibers to the concrete mix does significantly enhance the punching shear strength of slabs. A modification of the standard code design equation for shear punching strength of slabs is suggested to reflect the strength increase produced by the fibers. The tests also provided information on the shape and inclination of the fracture surface, and indicated that only a small, shallow region of the slab in the vicinity of the slab-column intersection is highly stressed in tension before rupture. This means that punching shear failure occurs in a progressive manner.