2.0 SHEAR
2.1 Concrete Breakout Failure Mode
Equations ψ ed , V
( continued )
Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering ψ ed , V
= 0.7 + 0.3 c a2 ≤1 . 0
1.5c a1
If more than one fixed edge perpendicular to the direction of the applied shear load exists , the smallest of these edge distances is used to calculate ψ ed , V
. For the application in the illustration below , if c a2 , x-
< c a2 , x + : ψ ed , V
= 0.7 + 0.3 ( c a2 , x-
/ 1.5c a1 )
Per Section 17.7.2.1.2 , when anchoring into a narrow section , the checks noted in ( a ) through ( c ) should also be made to determine if a modified c a1
-value should be used for the shear concrete breakout calculations . For the application below , h a is greater than 1.5c a1 , so no modified c a1
-value would be calculated .
Reference the Variables section of the PROFIS Engineering report for more information on the following parameters :
c a1
: fixed edge distance in the direction of the applied shear load
c a2
: fixed edge distance perpendicular to the direction of the applied shear load
h a
: concrete thickness
Reference the Calculations section of the PROFIS Engineering report for more information on ψ ed , V
.
170 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions