2.0 SHEAR
2.1 Concrete Breakout Failure Mode
Equations ψ h , V
Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering
ψ h , V
=
1.5c a1
17.7.2.6.1 Modification factor for anchors located in a concrete member where h ≥ 1.0 a
< 1.5c a1 , ψ h , V
, h a shall be calculated by Eq . ( 17.7.2.6.1 )
ψ h , V is a modification factor that is used to account for a concrete member thickness h a that is less than 1.5c a1 . The parameter c a1 corresponds to the distance of an anchor , in the direction of the applied shear load , to the fixed edge for which concrete breakout in shear is being calculated . ψ h , V is always ≥ 1.0 per the provisions of Section 17.7.2.6.1 . The figure below illustrates the conditions for which ψ h , V 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
h a
: concrete thickness
Reference the Calculations section of the PROFIS Engineering report for more information on ψ h , V
.
171 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions