Anchor Fastening Technical Guide , Edition 22
DESIGN DATA IN CONCRETE PER CSA A23.3
Limit State Design of anchors is described in the provisions of CSA A23.3 Annex D 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 Limit State Design tables with unfactored characteristic loads that are based on testing in accordance with ACI 355.4 . These tables are followed by factored resistance tables . The factored resistance tables have characteristic design loads that are prefactored by the applicable reduction factors for a single anchor with no anchor-to-anchor spacing or edge distance adjustments for the convenience of the user of this document . All the figures in the previous ACI 318 Chapter 17 design section are applicable to Limit State Design and the tables will reference these figures .
For a detailed explanation of the tables developed in accordance with CSA A23.3 Annex D , refer to Section 3.1.8 Technical assistance is available by contacting Hilti Canada at ( 800 ) 363-4458 or at www . hilti . ca .
3.2.5
Table 38 — Hilti HIT-ICE design information with HAS threaded rods in hammer drilled holes in accordance with CSA A23.3 Annex D 1
Design parameter Symbol Units
Nominal rod diameter ( in .) 3 / 8 1 / 2 5 / 8 3 / 4 7 / 8 1 1-1 / 4 A23.3-14
Nominal anchor O . D . d a mm 9.5 12.7 15.9 19.1 22.2 25.4 31.8
Effective minimum embedment 2 h ef , min mm 60 70 79 89 89 102 127
Effective maximum embedment 2 h ef , max mm 191 254 318 381 445 508 635
Minimum concrete thickness 2 h min mm h ef
+ 30 h ef + 2d o
Ref
Critical edge distance c ac mm
Minimum edge distance 3 c min mm 48 64 79 95 111 127 159
Minimum anchor spacing s min mm 48 64 79 95 111 127 159
Coeff . for factored concrete breakout resistance , uncracked concrete 4 k c , uncr
– 10 D . 6.2.2
Coeff . for factored concrete breakout resistance , cracked concrete 4 k c , cr – 7 D . 6.2.2
Concrete material resistance factor ф c – 0.65 8.4.2
Resistance modification factor for tension and shear , concrete failure modes , Condition B 5 R conc
– 1.00 D . 5.3 ( c )
Temp . range A 6 psi 715 615 520 420 325 Characteristic bond stress in cracked concrete 7 τ cr
( MPa ) ( 4.9 ) ( 4.2 ) ( 3.6 ) ( 2.9 ) ( 2.2 ) n / a n / a D . 6.5.2 psi 1,215 1,200 1,185 1,075 1,060 1,050 1,020
Characteristic bond stress in uncracked concrete 7 τ uncr ( MPa ) ( 8.4 ) ( 8.3 ) ( 8.2 ) ( 7.4 ) ( 7.3 ) ( 7.2 ) ( 7.0 )
Reduction for seismic tension α N , seis
– n / a
Permissible installation conditions
Resistance modification factor tension & shear , bond failure dry concrete
Resistance modification factor tension & shear , bond failure water-saturated concrete
Anchor category
– 2 1 2 1 1 1 1
R dry
– 0.85 1.00 0.85 1.00 1.00 1.00 1.00
Anchor category
– 2 1 2 1 1 1 1
R ws
– 0.85 1.00 0.85 1.00 1.00 1.00 1.00
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 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 ( 55 ° 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 ƒ ' c = 2500 psi ( 17.2 Mpa ). For concrete compressive strength , ƒ ' 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 ].
D . 6.5.2
D . 5.3 ( c )
D . 5.3 ( c )
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
219