Title:
Shear Friction and High-Strength Concrete
Author(s):
Alan H. Mattock
Publication:
Structural Journal
Volume:
98
Issue:
1
Appears on pages(s):
50-59
Keywords:
precast concrete; reinforced concrete; shear
DOI:
10.14359/10146
Date:
1/1/2001
Abstract:
Design provisions applicable when shear is transferred across a specific plane are set out in ACI 318-99, Section 11.7—Shear Friction. These provisions are used to design the required reinforcement across an existing or potential crack in the design of connections, or across an interface between concretes cast at different times. The design equations set out in Section 11.7.4, and the limitation of 0.2ƒc¢Ac , but not more than 800Ac , placed upon the shear strength Vn in Section 11.7.5, prevent full advantage being taken of the high shear transfer strengths that can be obtained when very-high-strength concretes are used. Shear transfer behavior and the available data from shear transfer tests of initially cracked specimens are re-examined. Simple equations are proposed for shear friction design, which allow the full potential shear transfer strength of all strengths of concrete to be utilized.