PART 4 SHEAR LOAD
Pryout Failure Mode ( Concrete Breakout )
Variables h ef
( continued )
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering
h ef
|
17.4 . 2 . 5 The modification factor for edge effects for single anchors or anchor groups loaded in tension , ψ ed , N
, shall be calculated as
|
cast-in-place headed bolts |
4d anchor
≤ h ef ≤ 25 ”
|
|
If c a , min ≥ 1.5h ef
, then ψ ed , Na = 1.0 ( 17.4.2.5a )
|
|
|
If c a , min < 1.5h ef
, then ψ ed , Na = 0.7 + 0.3 c a , min ( 17 . 4 . 2 . 5b )
1.5h ef
17.4 . 2.7 The modification factor for post-installed anchors designed for uncracked concrete in accordance with 17.4.2.6 without supplementary reinforcement to control splitting , ψ cp , N
, shall be calculated as follows using the critical distance c ac as defined in 17.7.6
If c a , min ≥ 1.5c ac
, then ψ cp , N = 1.0 ( 17.4.2.7a )
If c a , min < c ac
, then ψ cp , N = c a , min
( 17.4.2.7b ) c ac but ψ cp , N determined from Eq . ( 17.4.2.7b ) shall not be taken less than 1.5h ef
/ c ac , where the critical distance c ac is defined in 17.7.6 .
For post-installed mechanical anchors , PROFIS Engineering permits users to input specific h ef 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 )
17.4.2.2 The basic concrete breakout strength of a single anchor in tension in cracked concrete ,
N b
, shall not exceed
N ba
= k c λ a f ́c h ef
1.5
( 17.4.2.2a ) Alternatively , for cast-in headed studs and headed bolts with 11 in . ≤ h ef
≤ 25 in ., N b
, shall not exceed
N b
= 16λ a f ́c h ef
5 / 3
( 17.4.2.2b )
For post-installed adhesive anchors , PROFIS Engineering permits users to input a range of h ef 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
)
266 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions