Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 372

Table 5 — Load adjustment factors for 1 / 4-in . diameter Hilti KWIK HUS-EZ I and KWIK HUS-EZ E in uncracked concrete 1 , 2
1 / 4-in . KH-EZ 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
II to and away from edge
ƒ RV
Conc . thickness factor in shear 4
ƒ HV
Embedment
in .
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
h nom
( mm )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
Spacing ( s ) / edge distance ( c a
) / concrete thickness ( h ) - in . ( mm )
1-1 / 2
( 38 )
0.71
0.63
0.78
0.65
0.59
0.56
0.40
0.21
0.78
0.42
n / a
n / a
2
( 51 )
0.78
0.67
1.00
0.77
0.62
0.58
0.61
0.33
1.00
0.65
n / a
n / a
2-1 / 2
( 64 )
0.85
0.72
0.90
0.65
0.60
0.86
0.46
0.90
n / a
n / a
3
( 76 )
0.92
0.76
1.00
0.68
0.62
1.00
0.60
1.00
n / a
n / a
3-1 / 4
( 83 )
0.96
0.78
0.70
0.63
0.68
0.88
n / a
3-1 / 2
( 89 )
0.99
0.80
0.71
0.64
0.76
0.92
n / a
4
( 102 )
1.00
0.85
0.74
0.66
0.92
0.98
n / a
4-1 / 8
( 105 )
0.86
0.75
0.66
0.97
1.00
0.81
4-1 / 2
( 114 )
0.89
0.77
0.68
1.00
0.84
5
( 127 )
0.93
0.80
0.70
0.89
5-1 / 2
( 140 )
0.98
0.83
0.72
0.93
6
( 152 )
1.00
0.86
0.74
0.97
7
( 178 )
0.92
0.78
1.00
8
( 203 )
0.98
0.82
9
( 229 )
1.00
0.86
10
( 254 )
0.89
11
( 279 )
0.93
12
( 305 )
0.97
14
( 356 )
1.00
Table 6 — Load adjustment factors for 1 / 4-in . diameter Hilti KWIK HUS-EZ I and KWIK HUS-EZ E in cracked concrete 1 , 2
1 / 4-in . KH-EZ 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
II to and away from edge
ƒ RV
Conc . thickness factor in shear 4
ƒ HV
Embedment
in .
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
1-5 / 8
2-1 / 2
h nom
( mm )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
( 41 )
( 64 )
Spacing ( s ) / edge distance ( c a
) / concrete thickness ( h ) - in . ( mm )
1-1 / 2
( 38 )
0.71
0.63
0.88
0.65
0.59
0.56
0.40
0.21
0.80
0.43
n / a
n / a
2
( 51 )
0.78
0.67
1.00
0.77
0.62
0.58
0.62
0.33
1.00
0.66
n / a
n / a
2-1 / 2
( 64 )
0.85
0.72
0.90
0.65
0.60
0.87
0.46
0.90
n / a
n / a
3
( 76 )
0.92
0.76
1.00
0.68
0.62
1.00
0.60
1.00
n / a
n / a
3-1 / 4
( 83 )
0.96
0.78
0.70
0.63
0.68
0.89
n / a
3-1 / 2
( 89 )
0.99
0.80
0.71
0.64
0.76
0.92
n / a
4
( 102 )
1.00
0.85
0.74
0.66
0.93
0.98
n / a
4-1 / 8
( 105 )
0.86
0.75
0.66
0.97
1.00
0.81
4-1 / 2
( 114 )
0.89
0.77
0.68
1.00
0.85
5
( 127 )
0.93
0.80
0.70
0.89
5-1 / 2
( 140 )
0.98
0.83
0.72
0.93
6
( 152 )
1.00
0.86
0.74
0.98
7
( 178 )
0.92
0.78
1.00
8
( 203 )
0.98
0.82
9
( 229 )
1.00
0.86
10
( 254 )
0.90
11
( 279 )
0.94
12
( 305 )
0.98
14
( 356 )
1.00
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 software or perform anchor calculation using design equations from ACI 318 Chapter 17 .
3 Spacing factor reduction in shear , ƒ AV , assumes an influence of a nearby edge . If no edge exists , then ƒ AV
= ƒ AN .
4 Concrete thickness reduction factor in shear , ƒ HV , assumes an influence of a nearby edge . If no edge exists , then ƒ 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 table 5 and figure 2 of section 3.3.6 to calculate permissable edge distance , spacing and concrete thickness combinations .
368 Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.8 KWIK HUS-EZ I AND KWIK HUS-EZ E CARBON STEEL SCREW 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