Anchor Fastening Technical Guide , Edition 22
DESIGN DATA IN CONCRETE PER ACI 318
ACI 318 Chapter 17 design
Load Resistance Factored Design of anchors is described in the provisions of ACI 318 Chapter 17 for post-installed anchors tested and assessed in accordance with ACI 355.2 for mechanical anchors and ACI 355.4 for adhesive anchors . This section contains the Load Resistance Factored Design tables with unfactored characteristic loads that are based on testing in accordance with ACI 355.4 . These tables are followed by Hilti Simplified Design Tables . The load values in these tables were developed using the Strength Design parameters developed through testing per ACI 355.4 and the equations within ACI 318 Chapter 17 . For a detailed explanation of the Hilti Simplified Design Tables , refer to the of the Hilti North American Product Technical Guide , Volume 2 : Anchor Fastening Technical Guide . For additional information or technical assistance , contact Hilti at 800-879-5000 ( US ) or 800-363-4459 ( CA )
3.2.5
Table 3 — Hilti HIT-ICE design information with HAS threaded rods in holes drilled with a hammer drill and carbide bit ( or hollow drill bit ) in accordance with ACI 318 Ch . 17 1
Design parameter Symbol Units
Nominal rod diameter ( in .) 3 / 8 1 / 2 5 / 8 3 / 4 7 / 8 1 1-1 / 4
Nominal anchor diameter d a in 3 / 8 1 / 2 5 / 8 3 / 4 7 / 8 1 1-1 / 4 ( mm ) ( 9.5 ) ( 12.7 ) ( 15.9 ) ( 19.1 ) ( 22.2 ) ( 25.4 ) ( 31.8 )
Effective minimum embedment 2 h ef , min in 2-3 / 8 2-3 / 4 3-1 / 8 3-1 / 2 3-1 / 2 4 5 ( mm ) ( 60 ) ( 70 ) ( 79 ) ( 89 ) ( 89 ) ( 102 ) ( 127 )
Effective maximum embedment 2 h ef , max in 7-1 / 2 10 12-1 / 2 15 17-1 / 2 20 25 ( mm ) ( 191 ) ( 254 ) ( 318 ) ( 381 ) ( 445 ) ( 508 ) ( 635 ) in h
Minimum concrete thickness 2 h ef
+ 1-1 / 4 min
( mm ) ( h ef + 30 ) hef + 2d 0
( 8 )
Ref ACI 318
Critical edge distance c ac in ( mm )
Minimum edge distance 3 c min in 1-7 / 8 2-1 / 2 3-1 / 8 3-3 / 4 4-3 / 8 5 6-1 / 4 ( mm ) ( 48 ) ( 64 ) ( 79 ) ( 95 ) ( 111 ) ( 127 ) ( 159 )
Minimum anchor spacing s min in 1-7 / 8 2-1 / 2 3-1 / 8 3-3 / 4 4-3 / 8 5 6-1 / 4 ( mm ) ( 48 ) ( 64 ) ( 79 ) ( 95 ) ( 111 ) ( 127 ) ( 159 )
Effectiveness factor for uncracked concrete 4 k c , uncr -
Effectiveness factor for cracked concrete 4 k c , cr -
Strength reduction factor for tension , concrete failure modes 5 Ф c , N - 0.65 17.3.3
Strength reduction factor for shear , concrete failure modes 5 Ф c , V - 0.70 17.3.3
Temperature range A 6
Permissible installation conditions psi 715 615 520 420 325 Characteristic bond stress in cracked concrete 7 τ k , cr
( MPa ) ( 4.9 ) ( 4.2 ) ( 3.6 ) ( 2.9 ) ( 2.2 )
24 ( 10 ) 17 ( 7.1 )
17.4.2.2
17.4.2.2
n / a n / a 17.4.5 psi 1,215 1,200 1,185 1,075 1,060 1,050 1,020
Characteristic bond stress in uncracked concrete 7 τ k , uncr ( MPa ) ( 8.4 ) ( 8.3 ) ( 8.2 ) ( 7.4 ) ( 7.3 ) ( 7.2 ) ( 7.0 )
Strength reduction factor for tension , bond failure modes , dry concrete
Strength reduction factor for tension , bond failure modes , water saturated concrete
- - 2 1 2 1 1 1 1 - - 0.55 0.65 0.55 0.65 0.65 0.65 0.65 - - 2 1 2 1 1 1 1 - - 0.55 0.65 0.55 0.65 0.65 0.65 0.65
1 Design information in this table is based on testing in accordance with ACI 355.4 . 2 See figure 2 and 3 of this section . 3 Minimum edge distance may be reduced to 1-3 / 4 " ( 44mm ) ≤ c min
< 5d provided T inst is reduced to 0.30 T inst for 5d < s < 16-in . and to 0.5T inst for s > 16-in .
4 For all design cases , ψ c , N = 1.0 . The appropriate coefficient for breakout resistance for cracked concrete ( k c , cr
) or uncracked concrete ( k c , uncr ) must be used .
5 Values provided for post-installed anchors under Condition B without supplementary reinforcement as defined in ACI 318 17.3.3 . For cases where the presence of supplementary reinforcement can be verified , the reduction factors associated with Condition A may be used .
6 Temperature range A : Max . short term temperature = 130 ° F ( 54 ° C ), max . long term temperature = 110 ° F ( 43 ° C ). Short term elevated concrete temperatures are those that occur over brief intervals , e . g ., as a result of diurnal cycling . Long term concrete temperatures are roughly constant over significant periods of time .
7 Bond strength values corresponding to concrete compressive strength f ' c = 2500 psi ( 17.2 Mpa ). For concrete compressive strength , f ' c
, between 2,500 psi
( 17.2 Mpa ) and 8,000 psi ( 55.2 Mpa ), the tabulated characteristic bond strength may be increased by a factor of ( f ' c / 2,500 ) 0 . 1 [ for SI : ( f ' c
/ 17.2 ) 0 . 1 ]
8 d 0 = drilled hole diameter
17.4.5
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.5 HIT-ICE ADHESIVE ANCHORING SYSTEM Hilti , Inc . 1-800-879-8000 | en español 1-800-879-5000 | www . hilti . com | Hilti ( Canada ) Corporation | www . hilti . ca | 1-800-363-4458
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