PART 4 SHEAR LOAD
Pryout Failure Mode ( Concrete Breakout )
Variables c ac
( continued )
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering
c ac
Example of critical edge distance requirements given in an adhesive anchor approval . Reference ICC-ESR-3187 Section 4.1.10.2 .
4.1.10.2 Threaded Rod , Steel Reinforcing Bars , and Hilti HIS-N and HIS-RN Inserts : The modification factor ψ cp , Na must be determined in accordance with ACI 318-14 17.4.5.5 or ACI 318-11 D . 5.5 as applicable , except as noted below .
For all cases where c Na / c ac
< 1.0 , ψ cp , Na determined from ACI 318-14 Eq . 17.4.5.5b or ACI 318-11 Eq . D-27 , as applicable , need not be taken less than c Na
/ c ac . For all other cases ψ cp , Na shall be taken as
1.0 . The critical edge distance c ac must be calculated according to Eq . 17.4.5.5c for ACI 318-14 or Eq . D-27a for ACI 318-11 , in lieu of ACI 318-14 17.7.6 or ACI 318-11 D . 8.6 as applicable .
c ac
= h ef
0.4 т k , uncr
⁎ 3.1 – 0.7 h 1160 h ef
( Eq . 17.4.5.5c for ACI 318-14 or Eq . D-27a for ACI 318-11 )
where h
h ef need not be taken as larger than 2.4 ; and т k , uncr is the characteristic bond strength in uncracked concrete , h is the member thickness , and h ef is the embedment depth . т k , uncr need not be taken greater than :
т k , uncr
= k uncr h ef f ́c Eq . ( 4-1 ) π d
272 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions