2.0 SHEAR
2.2 Pryout Failure Mode
Variables h ef
( continued )
Variables ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering
h ef
17.6 . 2.4.1 Modification factor for edge effects for single anchors or anchor groups loaded in tension , ψ ed , N
, shall be determined by ( a ) or ( b ). cast-in-place headed bolts
4d anchor
< h ef < 25 ”
( a ) If c a , min ≥ 1.5h ef
, then ψ ed , N = 1.0 ( 17.6.2.4.1a )
( b ) If c a , min < 1.5h ef
, then ψ ed , N = 0.7 + 0.3 c a , min ( 17 . 6 . 2 . 4 . 1b )
1.5h ef
17.6.2.6.1 Modification factor for post-installed anchors designed for uncracked concrete in accordance with 17.6.2.5 without supplementary reinforcement to control splitting , ψ cp , N
, shall be determined by ( a ) or ( b ) using the critical distance c ac as defined in 17.9.5 .
( a ) If c a , min ≥ c ac
, then ψ cp , N = 1.0 ( 17.6.2.6.1a )
( b ) If c a , min < c ac
, then ψ cp , N = c a , min
c ac
≥
1.5h ef ( 17 . 6 . 2 . 6 . 1b )
c ac
17.6.2.2.1 Basic concrete breakout strength of a single anchor in tension in cracked concrete , N b , shall be calculated by Eq . ( 17.6.2.2.1 ) except as permitted in 17.6.2.2.3
For post-installed mechanical anchors , PROFIS Engineering permits users to input specific hef values that are relative to a specific diameter as given in the ICC-ES evaluation report for the anchor .
post-installed expansion anchor ( reference product approval for h ef
)
N b
= k c λ a ƒ ́c h ef
1.5
( 17.6.2.2.1 )
17.6.2.2.3 For single cast-in headed studs and headed bolts with 11 in . ≤ h ef ≤ 25 in ., N b
, shall be calculated by :
N b
= 16λ a ƒ ́c h ef
5 / 3
( 17.6.2.2.3 )
For post-installed adhesive anchors , PROFIS Engineering permits users to input a range of hef values that are relative to a specific diameter as given in the ICC-ES evaluation report for the anchor .
post-installed adhesive anchor
h ef , min
≤ h ef
≤ h ef , max ( reference product approval for h ef , min and h ef , max
)
217 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions