Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 386

Table 10 — Load adjustment factors for 5 / 8-in . diameter Hilti KB1 in uncracked concrete 1 , 2
5 / 8-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 )
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
4-1 / 4
( 108 )
n / a
0.68
n / a
0.52
n / a
0.57
n / a
0.26
n / a
0.51
n / a
n / a
5
( 127 )
n / a
0.71
n / a
0.58
n / a
0.58
n / a
0.33
n / a
0.58
0.55
n / a
5-1 / 2
( 140 )
0.83
0.73
0.50
0.62
0.58
0.59
0.35
0.38
0.50
0.62
0.58
n / a
6
( 152 )
0.86
0.75
0.55
0.67
0.59
0.59
0.40
0.43
0.55
0.67
0.60
0.62
7
( 178 )
0.92
0.79
0.64
0.78
0.61
0.61
0.51
0.54
0.64
0.78
0.65
0.67
8
( 203 )
0.98
0.83
0.73
0.89
0.62
0.63
0.62
0.66
0.73
0.89
0.70
0.71
9
( 229 )
1.00
0.88
0.82
1.00
0.64
0.64
0.74
0.79
0.82
1.00
0.74
0.75
10
( 254 )
0.92
0.91
0.65
0.66
0.87
0.92
0.91
0.78
0.80
12
( 305 )
1.00
1.00
0.68
0.69
1.00
1.00
1.00
0.85
0.87
14
( 356 )
0.71
0.72
0.92
0.94
16
( 406 )
0.74
0.75
0.98
1.00
18
( 457 )
0.77
0.78
1.00
20
( 508 )
0.80
0.82
24
( 610 )
0.86
0.88
> 30
( 762 )
0.95
0.97
Table 11 — Load adjustment factors for 5 / 8-in . diameter Hilti KB1 in cracked concrete 1 , 2
5 / 8-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 )
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
2-3 / 4
4
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
( 70 )
( 102 )
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
3-1 / 4
4-1 / 2
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
( 83 )
( 114 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
4-1 / 4
( 108 )
n / a
0.68
n / a
0.78
n / a
0.57
n / a
0.26
n / a
0.52
n / a
n / a
5
( 127 )
n / a
0.71
n / a
0.87
n / a
0.58
n / a
0.33
n / a
0.66
0.66
n / a
5-1 / 2
( 140 )
0.83
0.73
1.00
0.93
0.62
0.59
0.62
0.38
1.00
0.76
0.70
n / a
6
( 152 )
0.86
0.75
1.00
1.00
0.63
0.60
0.71
0.43
1.00
0.87
0.73
0.62
7
( 178 )
0.92
0.79
1.00
0.65
0.61
0.89
0.55
1.00
1.00
0.79
0.67
8
( 203 )
0.98
0.83
1.00
0.68
0.63
1.00
0.67
1.00
0.84
0.71
9
( 229 )
1.00
0.88
0.70
0.64
0.80
0.89
0.76
10
( 254 )
0.92
0.72
0.66
0.93
0.94
0.80
12
( 305 )
1.00
0.76
0.69
1.00
1.00
0.87
14
( 356 )
0.81
0.72
0.94
16
( 406 )
0.85
0.75
1.00
18
( 457 )
0.90
0.79
20
( 508 )
0.94
0.82
24
( 610 )
1.00
0.88
> 30
( 762 )
0.98
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 .
382 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