Title:
Shear Friction Tests with High-Strength Concrete
Author(s):
Lawrence F. Kahn and Andrew D. Mitchell
Publication:
Structural Journal
Volume:
99
Issue:
1
Appears on pages(s):
98-103
Keywords:
high-strength concrete; shear; test.
DOI:
10.14359/11040
Date:
1/1/2002
Abstract:
This experimental study showed that the current ACI shear friction concept can be extended to high-strength concrete. Fifty pushoff specimens were tested with uncracked, precracked, and cold-joint interfaces. These specimens mimicked those used by previous researchers in the development of shear friction. Concrete strengths varied from 6800 to 17,900 psi (46.9 to 123.4 MPa), with transverse reinforcing ratios between 0.37 and 1.47%. An equation is proposed that more accurately predicts the shear friction strength of cold-joint and uncracked interfaces for high-strength concrete. It is recommended that the current upper shear stress limit of 0.2fc¢ be retained but that the 800 psi (5.5 MPa) shear stress limit be eliminated.