Anchor Fastening Technical Guide , Edition 22
Table 8 — Load adjustment factors for 1 / 2-in . diameter Hilti KB1 in uncracked concrete 1 , 2
1 / 2-in . KB1 uncracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 3
ƒ AV
Edge distance in shear
┴ Toward edge
ƒ RV
‖ To edge
ƒ RV
Concrete thickness factor
4 in shear ƒ HV
Embedment h ef in ( mm )
2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
Embedment h nom in ( mm )
2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 )
2-3 / 4 ( 70 ) n / a n / a n / a 0.33 n / a n / a n / a 0.14 n / a 0.29 n / a n / a 3 ( 76 ) n / a n / a n / a 0.35 n / a n / a n / a 0.16 n / a 0.33 n / a n / a
3-1 / 2 ( 89 ) n / a n / a n / a 0.38 n / a n / a n / a 0.21 n / a 0.38 n / a n / a 4 ( 102 ) n / a 0.71 0.67 0.42 n / a 0.57 0.54 0.25 0.67 0.42 0.67 n / a 5 ( 127 ) 0.92 0.76 0.83 0.50 0.64 0.58 0.76 0.35 0.83 0.50 0.75 n / a 6 ( 152 ) 1.00 0.81 1.00 0.60 0.67 0.60 1.00 0.46 1.00 0.60 0.82 0.63 7 ( 178 ) 1.00 0.86 1.00 0.70 0.69 0.62 1.00 0.59 1.00 0.70 0.88 0.68 8 ( 203 ) 0.91 0.80 0.72 0.63 0.72 0.80 0.94 0.73
8-1 / 2 ( 216 ) 0.94 0.85 0.74 0.64 0.78 0.85 0.97 0.75 9 ( 229 ) 0.96 0.90 0.75 0.65 0.85 0.90 1.00 0.77 10 ( 254 ) 1.00 1.00 0.78 0.67 1.00 1.00 0.82 11 ( 279 ) 0.81 0.68 0.86 12 ( 305 ) 0.83 0.70 0.89 14 ( 356 ) 0.89 0.73 0.97 16 ( 406 ) 0.94 0.77 1.00 18 ( 457 ) 1.00 0.80 20 ( 508 ) 0.83 > 24 ( 610 ) 0.90
Table 9 — Load adjustment factors for 1 / 2-in . diameter Hilti KB1 in cracked concrete 1 , 2
1 / 2-in . KB1 cracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 3
ƒ AV
Edge distance in shear
┴ Toward edge
ƒ RV
‖ To edge
ƒ RV
Concrete thickness factor
4 in shear ƒ HV
3.3.9
Embedment h ef in ( mm )
2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 2 3-1 / 4 ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 ) ( 51 ) ( 83 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
Embedment h nom in ( mm )
2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 2-3 / 8 3-5 / 8 ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 ) ( 60 ) ( 92 )
2-3 / 4 ( 70 ) n / a n / a n / a 0.68 n / a n / a n / a 0.16 n / a 0.33 n / a n / a 3 ( 76 ) n / a n / a n / a 0.71 n / a n / a n / a 0.19 n / a 0.38 n / a n / a
3-1 / 2 ( 89 ) n / a n / a n / a 0.79 n / a n / a n / a 0.24 n / a 0.47 n / a n / a 4 ( 102 ) n / a 0.71 1.00 0.86 n / a 0.57 1.00 0.29 1.00 0.58 0.84 n / a 5 ( 127 ) 0.92 0.76 1.00 1.00 0.72 0.59 1.00 0.40 1.00 0.81 0.94 n / a 6 ( 152 ) 1.00 0.81 1.00 0.76 0.61 1.00 0.53 1.00 1.00 1.00 0.66 7 ( 178 ) 1.00 0.86 1.00 0.81 0.63 1.00 0.67 1.00 0.71 8 ( 203 ) 1.00 0.91 0.85 0.65 0.82 0.76
8-1 / 2 ( 216 ) 1.00 0.94 0.87 0.65 0.90 0.79 9 ( 229 ) 0.96 0.90 0.66 0.98 0.81 10 ( 254 ) 1.00 0.94 0.68 1.00 0.85 11 ( 279 ) 0.98 0.70 0.90 12 ( 305 ) 1.00 0.72 0.94 14 ( 356 ) 0.76 1.00 16 ( 406 ) 0.79 18 ( 457 ) 0.83 20 ( 508 ) 0.86 > 24 ( 610 ) 0.94
1 Linear interpolation not permitted 2 When combining multiple load adjustment factors ( e . g . for a 4 anchor pattern in a corner with thin concrete member ) the design can become very conservative . To optimize the design , use Hilti PROFIS Engineering Design software or perform anchor calculation using design equations from ACI 318 Ch . 17 or CSA A23.3 Annex D . 3 Spacing factor reduction in shear , f AV
, is applicable when edge distance c < 3h ef . If c ≥ 3h ef then f AV = f AN
.
4 Concrete thickness reduction factor in shear , f HV , is applicable when edge distance c < 3h ef
. If c ≥ 3h ef then f HV
= 1.0 .
If a reduction factor value is in a shaded cell , this indicates that this specific edge distance may not be permitted with a certain spacing ( or vice versa ). Check with Figure 2 and Table 5 to calculate permissible edge distance , spacing and concrete thickness combinations .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.9 KB1 EXPANSION ANCHOR 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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