Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 387

Anchor Fastening Technical Guide , Edition 22
Table 12 — Load adjustment factors for 3 / 4-in . diameter Hilti KB1 in uncracked concrete 1 , 2
3 / 4-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 )
Embedment h nom in ( mm )
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
4
( 102 )
n / a
0.64
n / a
n / a
n / a
0.56
n / a
n / a
n / a
n / a
n / a
n / a
4-1 / 2
( 114 )
n / a
0.66
n / a
0.47
n / a
0.56
n / a
0.24
n / a
0.47
n / a
n / a
5
( 127 )
0.76
0.68
n / a
0.50
0.57
0.57
n / a
0.28
n / a
0.50
n / a
n / a
5-1 / 2
( 140 )
0.78
0.69
n / a
0.53
0.58
0.58
n / a
0.32
n / a
0.53
0.55
n / a
6-1 / 2
( 165 )
0.83
0.73
n / a
0.60
0.59
0.59
n / a
0.41
n / a
0.60
0.60
n / a
7
( 178 )
0.86
0.75
n / a
0.64
0.60
0.60
n / a
0.46
n / a
0.64
0.62
n / a
8
( 203 )
0.91
0.78
n / a
0.73
0.61
0.61
n / a
0.56
n / a
0.73
0.67
0.67
9-1 / 2
( 241 )
0.99
0.83
0.79
0.86
0.63
0.63
0.70
0.72
0.79
0.86
0.73
0.73
10
( 254 )
1.00
0.85
0.83
0.91
0.64
0.64
0.76
0.78
0.83
0.91
0.75
0.75
12
( 305 )
0.92
1.00
1.00
0.67
0.67
1.00
1.00
1.00
1.00
0.82
0.82
16
( 406 )
1.00
0.72
0.73
0.94
0.95
20
( 508 )
0.78
0.78
1.00
1.00
24
( 610 )
0.83
0.84
30
( 762 )
0.92
0.92
> 36
( 914 )
1.00
1.00
Table 13 — Load adjustment factors for 3 / 4-in . diameter Hilti KB1 in cracked concrete 1 , 2
3 / 4-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
Embedment h ef in ( mm )
Embedment h nom in ( mm )
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
3-1 / 4
4-3 / 4
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
( 83 )
( 121 )
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
4
5-1 / 2
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
( 102 )
( 140 )
3.3.9
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
4
( 102 )
n / a
0.64
n / a
n / a
n / a
0.55
n / a
n / a
n / a
n / a
n / a
n / a
4-1 / 2
( 114 )
n / a
0.66
n / a
0.73
n / a
0.56
n / a
0.19
n / a
0.39
n / a
n / a
5
( 127 )
0.76
0.68
n / a
0.77
0.59
0.56
n / a
0.23
n / a
0.45
n / a
n / a
5-1 / 2
( 140 )
0.78
0.69
n / a
0.83
0.59
0.57
n / a
0.26
n / a
0.52
0.61
n / a
6-1 / 2
( 165 )
0.83
0.73
n / a
0.93
0.61
0.58
n / a
0.33
n / a
0.67
0.67
n / a
7
( 178 )
0.86
0.75
n / a
0.99
0.62
0.59
n / a
0.37
n / a
0.75
0.69
n / a
8
( 203 )
0.91
0.78
n / a
1.00
0.64
0.60
n / a
0.46
n / a
0.91
0.74
0.63
9-1 / 2
( 241 )
0.99
0.83
1.00
0.66
0.62
0.97
0.59
1.00
1.00
0.81
0.69
10
( 254 )
1.00
0.85
0.67
0.62
1.00
0.64
0.83
0.70
12
( 305 )
0.92
0.71
0.65
0.84
0.91
0.77
16
( 406 )
1.00
0.77
0.70
1.00
1.00
0.89
20
( 508 )
0.84
0.75
0.99
24
( 610 )
0.91
0.80
1.00
30
( 762 )
1.00
0.87
> 36
( 914 )
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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