Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 271

Anchor Fastening Technical Guide , Edition 22
Table 8 — Load adjustment factors for M16 and M20 Hilti HDA-P and HDA-T carbon and stainless steel anchors in uncracked concrete 1 , 2
M16 and M20 HDA-P and HDA-T 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
Nominal diameter M16 M20 M16 M20 M16 M20 M16 M20 M16 M20 M16 M20
Effective
mm
190
250
190
250
190
250
190
250
190
250
190
250
embedment h ef
( in .)
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
Spacing ( s ) / edge distance ( c a
) / concrete thickness ( h ) - in . ( mm )
6
( 152 )
n / a
n / a
0.66
n / a
n / a
n / a
0.15
n / a
0.30
n / a
n / a
n / a
7
( 178 )
n / a
n / a
0.72
n / a
n / a
n / a
0.19
n / a
0.38
n / a
n / a
n / a
7-1 / 8
( 181 )
n / a
n / a
0.73
n / a
n / a
n / a
0.20
n / a
0.39
n / a
n / a
n / a
7-1 / 2
( 191 )
0.67
n / a
0.75
n / a
0.56
n / a
0.21
n / a
0.42
n / a
n / a
n / a
8
( 203 )
0.68
n / a
0.78
0.66
0.56
n / a
0.23
0.15
0.46
0.31
n / a
n / a
9
( 229 )
0.70
n / a
0.85
0.71
0.57
n / a
0.28
0.18
0.55
0.37
n / a
n / a
10
( 254 )
0.72
0.67
0.91
0.76
0.58
0.56
0.32
0.22
0.65
0.43
n / a
n / a
11
( 279 )
0.75
0.69
0.98
0.81
0.59
0.57
0.37
0.25
0.75
0.50
0.59
n / a
12
( 305 )
0.77
0.70
1.00
0.86
0.59
0.57
0.43
0.28
0.85
0.57
0.61
n / a
14
( 356 )
0.81
0.74
0.96
0.61
0.58
0.54
0.36
1.00
0.71
0.66
0.58
16
( 406 )
0.86
0.77
1.00
0.63
0.60
0.66
0.44
0.87
0.71
0.62
18
( 457 )
0.90
0.80
0.64
0.61
0.78
0.52
1.00
0.75
0.66
20
( 508 )
0.95
0.84
0.66
0.62
0.92
0.61
0.79
0.69
24
( 610 )
1.00
0.91
0.69
0.64
1.00
0.80
0.87
0.76
30
( 762 )
1.00
0.74
0.68
1.00
0.97
0.85
36
( 914 )
0.78
0.72
1.00
0.93
42
( 1067 )
0.83
0.75
1.00
> 48
( 1219 )
0.88
0.79
3.3.1
Table 9 — Load adjustment factors for M16 and M20 Hilti HDA-P and HDA-T carbon and stainless steel anchors in cracked concrete 1 , 2
M16 and M20 HDA-P and HDA-T 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
Nominal diameter M16 M20 M16 M20 M16 M20 M16 M20 M16 M20 M16 M20
Effective
mm
190
250
190
250
190
250
190
250
190
250
190
250
embedment h ef
( in .)
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
( 7.48 )
( 9.84 )
Spacing ( s ) / edge distance ( c a
) / concrete thickness ( h ) - in . ( mm )
6
( 152 )
n / a
n / a
0.66
n / a
n / a
n / a
0.13
n / a
0.27
n / a
n / a
n / a
7
( 178 )
n / a
n / a
0.72
n / a
n / a
n / a
0.17
n / a
0.34
n / a
n / a
n / a
7-1 / 8
( 181 )
n / a
n / a
0.73
n / a
n / a
n / a
0.17
n / a
0.35
n / a
n / a
n / a
7-1 / 2
( 191 )
0.67
n / a
0.75
n / a
0.55
n / a
0.19
n / a
0.38
n / a
n / a
n / a
8
( 203 )
0.68
n / a
0.78
0.66
0.56
n / a
0.21
0.14
0.41
0.27
n / a
n / a
9
( 229 )
0.70
n / a
0.85
0.71
0.57
n / a
0.25
0.16
0.49
0.33
n / a
n / a
10
( 254 )
0.72
0.67
0.91
0.76
0.57
0.56
0.29
0.19
0.58
0.38
n / a
n / a
11
( 279 )
0.75
0.69
0.98
0.81
0.58
0.56
0.33
0.22
0.67
0.44
0.57
n / a
12
( 305 )
0.77
0.70
1.00
0.86
0.59
0.57
0.38
0.25
0.76
0.50
0.59
n / a
14
( 356 )
0.81
0.74
0.96
0.60
0.58
0.48
0.32
0.96
0.64
0.64
0.56
16
( 406 )
0.86
0.77
1.00
0.62
0.59
0.59
0.39
1.00
0.78
0.68
0.60
18
( 457 )
0.90
0.80
0.63
0.60
0.70
0.46
0.93
0.72
0.63
20
( 508 )
0.95
0.84
0.65
0.61
0.82
0.54
1.00
0.76
0.67
24
( 610 )
1.00
0.91
0.68
0.63
1.00
0.71
0.84
0.73
30
( 762 )
1.00
0.72
0.67
1.00
0.94
0.82
36
( 914 )
0.76
0.70
1.00
0.89
42
( 1067 )
0.81
0.73
0.97
> 48
( 1219 )
0.85
0.77
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 PROFIS Engineering 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 .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.1 HDA UNDERCUT ANCHORS 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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