Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 384

Table 6 — Load adjustment factors for 3 / 8-in . diameter Hilti KB1 in uncracked concrete 1 , 2
3 / 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 )
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
2-1 / 2
( 64 )
n / a
n / a
n / a
0.52
n / a
n / a
n / a
0.35
n / a
0.52
n / a
n / a
3-3 / 8
( 86 )
n / a
n / a
n / a
0.68
n / a
n / a
n / a
0.55
n / a
0.68
0.53
n / a
3-1 / 2
( 89 )
n / a
0.79
n / a
0.70
n / a
0.62
n / a
0.59
n / a
0.70
0.54
n / a
4
( 102 )
n / a
0.83
n / a
0.80
n / a
0.63
n / a
0.72
n / a
0.80
0.58
0.73
5
( 127 )
n / a
0.92
n / a
1.00
n / a
0.67
n / a
1.00
n / a
1.00
0.65
0.82
6
( 152 )
n / a
1.00
n / a
1.00
n / a
0.70
n / a
1.00
n / a
1.00
0.71
0.89
7
( 178 )
n / a
1.00
n / a
n / a
0.73
n / a
n / a
0.76
0.97
8
( 203 )
1.00
1.00
0.67
0.77
1.00
1.00
0.82
1.00
9
( 229 )
0.69
0.80
0.87
10
( 254 )
0.71
0.83
0.91
11
( 279 )
0.73
0.87
0.96
12
( 305 )
0.75
0.90
1.00
> 14
( 356 )
0.79
0.97
Table 7 — Load adjustment factors for 3 / 8-in . diameter Hilti KB1 in cracked concrete 1 , 2
3 / 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 )
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
1-1 / 2
2
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
( 38 )
( 51 )
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
1-7 / 8
2-3 / 8
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
( 48 )
( 60 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
2-1 / 2
( 64 )
n / a
n / a
n / a
0.87
n / a
n / a
n / a
0.49
n / a
0.87
n / a
n / a
3-3 / 8
( 86 )
n / a
n / a
n / a
1.00
n / a
n / a
n / a
0.77
n / a
1.00
0.85
n / a
3-1 / 2
( 89 )
n / a
0.79
n / a
1.00
n / a
0.65
n / a
0.82
n / a
1.00
0.86
n / a
4
( 102 )
n / a
0.83
n / a
1.00
n / a
0.67
n / a
1.00
n / a
1.00
0.92
0.82
5
( 127 )
n / a
0.92
n / a
1.00
n / a
0.71
n / a
1.00
n / a
1.00
1.00
0.91
6
( 152 )
n / a
1.00
n / a
1.00
n / a
0.75
n / a
n / a
1.00
1.00
7
( 178 )
n / a
1.00
n / a
n / a
0.79
n / a
n / a
8
( 203 )
1.00
1.00
0.93
0.83
1.00
1.00
9
( 229 )
0.98
0.87
10
( 254 )
1.00
0.92
11
( 279 )
0.96
12
( 305 )
1.00
> 14
( 356 )
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 .
380 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