Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 85

Anchor Fastening Technical Guide , Edition 22
Table 77 — Load adjustment factors for 25M rebar in uncracked concrete 1 , 2 , 3
Edge distance in shear
25M Rebar uncracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 4
ƒ AV
┴ Toward edge
ƒ RV
⃦ To and away from edge
ƒ RV
Concrete thickness factor in shear 5
ƒ HV
3.2.2
Spacing ( s ) / edge distance ( c a ) / concrete thickness ( h ), - in . ( mm )
Embedment h ef
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
in .
( mm )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.22
0.12
0.10
n / a
n / a
n / a
0.02
0.01
0.01
0.04
0.02
0.02
n / a
n / a
n / a
5
( 127 )
0.59
0.55
0.54
0.30
0.17
0.13
0.54
0.52
0.52
0.11
0.05
0.04
0.22
0.10
0.08
n / a
n / a
n / a
6
( 152 )
0.61
0.56
0.55
0.33
0.18
0.14
0.55
0.53
0.52
0.14
0.06
0.05
0.28
0.13
0.10
n / a
n / a
n / a
7
( 178 )
0.63
0.57
0.56
0.36
0.20
0.16
0.55
0.53
0.53
0.18
0.08
0.06
0.36
0.16
0.13
n / a
n / a
n / a
8
( 203 )
0.65
0.58
0.57
0.39
0.21
0.17
0.56
0.54
0.53
0.22
0.10
0.08
0.41
0.20
0.16
n / a
n / a
n / a
9
( 229 )
0.67
0.59
0.58
0.42
0.23
0.18
0.57
0.54
0.53
0.26
0.12
0.09
0.44
0.24
0.19
n / a
n / a
n / a
10
( 254 )
0.68
0.60
0.58
0.45
0.25
0.20
0.58
0.54
0.54
0.30
0.14
0.11
0.47
0.28
0.22
n / a
n / a
n / a
11-9 / 16
( 294 )
0.71
0.62
0.60
0.50
0.28
0.22
0.59
0.55
0.54
0.38
0.17
0.14
0.52
0.34
0.28
0.59
n / a
n / a
12
( 305 )
0.72
0.63
0.60
0.52
0.28
0.23
0.59
0.55
0.55
0.40
0.18
0.15
0.53
0.36
0.29
0.60
n / a
n / a
14
( 356 )
0.76
0.65
0.62
0.60
0.33
0.26
0.61
0.56
0.55
0.50
0.23
0.18
0.60
0.39
0.34
0.65
n / a
n / a
16
( 406 )
0.79
0.67
0.63
0.69
0.38
0.30
0.62
0.57
0.56
0.62
0.28
0.22
0.69
0.42
0.37
0.69
n / a
n / a
18
( 457 )
0.83
0.69
0.65
0.77
0.42
0.34
0.64
0.58
0.57
0.74
0.33
0.27
0.77
0.46
0.39
0.74
n / a
n / a
18-7 / 16
( 469 )
0.84
0.69
0.66
0.79
0.43
0.35
0.64
0.58
0.57
0.76
0.35
0.28
0.79
0.46
0.40
0.75
0.57
n / a
20
( 508 )
0.87
0.71
0.67
0.86
0.47
0.37
0.65
0.59
0.58
0.86
0.39
0.31
0.86
0.49
0.42
0.78
0.60
n / a
22-3 / 8
( 568 )
0.91
0.73
0.69
0.96
0.53
0.42
0.67
0.60
0.59
1.00
0.46
0.37
0.96
0.53
0.45
0.82
0.63
0.59
24
( 610 )
0.94
0.75
0.70
1.00
0.56
0.45
0.68
0.61
0.59
0.51
0.41
1.00
0.56
0.47
0.85
0.65
0.61
26
( 660 )
0.98
0.77
0.72
0.61
0.49
0.70
0.62
0.60
0.58
0.46
0.61
0.50
0.89
0.68
0.63
28
( 711 )
1.00
0.79
0.74
0.66
0.52
0.71
0.62
0.61
0.65
0.52
0.66
0.53
0.92
0.71
0.66
30
( 762 )
0.81
0.75
0.71
0.56
0.73
0.63
0.62
0.72
0.58
0.71
0.56
0.95
0.73
0.68
36
( 914 )
0.88
0.80
0.85
0.67
0.77
0.66
0.64
0.94
0.76
0.85
0.67
1.00
0.80
0.74
> 48
( 1219 )
1.00
0.90
1.00
0.90
0.86
0.71
0.68
1.00
1.00
1.00
0.90
0.92
0.86
Table 78 — Load adjustment factors for 25M rebar in cracked concrete 1 , 2 , 3
Edge distance in shear
25M Rebar cracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 4
ƒ AV
┴ Toward edge
ƒ RV
⃦ To and away from edge
ƒ RV
Concrete thickness factor in shear 5
ƒ HV
Spacing ( s ) / edge distance ( c a ) / concrete thickness ( h ), - in . ( mm )
Embedment h ef
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
9-1 / 16
15-15 / 16 19-13 / 16
in .
( mm )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
( 230 )
( 405 )
( 504 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.42
0.39
0.38
n / a
n / a
n / a
0.02
0.01
0.01
0.05
0.03
0.02
n / a
n / a
n / a
5
( 127 )
0.59
0.55
0.54
0.55
0.46
0.44
0.54
0.53
0.52
0.11
0.06
0.05
0.23
0.13
0.10
n / a
n / a
n / a
6
( 152 )
0.61
0.56
0.55
0.60
0.48
0.46
0.55
0.53
0.53
0.15
0.08
0.07
0.30
0.17
0.14
n / a
n / a
n / a
7
( 178 )
0.63
0.57
0.56
0.65
0.51
0.48
0.55
0.54
0.53
0.19
0.11
0.09
0.38
0.21
0.17
n / a
n / a
n / a
8
( 203 )
0.65
0.58
0.57
0.70
0.53
0.50
0.56
0.54
0.54
0.23
0.13
0.11
0.46
0.26
0.21
n / a
n / a
n / a
9
( 229 )
0.67
0.59
0.58
0.75
0.56
0.51
0.57
0.55
0.54
0.27
0.16
0.13
0.55
0.31
0.25
n / a
n / a
n / a
10
( 254 )
0.68
0.60
0.58
0.80
0.59
0.53
0.58
0.55
0.55
0.32
0.18
0.15
0.64
0.37
0.29
n / a
n / a
n / a
11-9 / 16
( 294 )
0.71
0.62
0.60
0.89
0.63
0.57
0.59
0.56
0.55
0.40
0.23
0.18
0.80
0.46
0.37
0.60
n / a
n / a
12
( 305 )
0.72
0.63
0.60
0.91
0.64
0.58
0.59
0.56
0.56
0.42
0.24
0.19
0.85
0.48
0.39
0.61
n / a
n / a
14
( 356 )
0.76
0.65
0.62
1.00
0.69
0.62
0.61
0.58
0.56
0.53
0.30
0.24
1.00
0.61
0.49
0.66
n / a
n / a
16
( 406 )
0.79
0.67
0.63
0.75
0.66
0.63
0.59
0.57
0.65
0.37
0.30
0.74
0.59
0.71
n / a
n / a
18
( 457 )
0.83
0.69
0.65
0.81
0.71
0.64
0.60
0.58
0.78
0.44
0.35
0.81
0.71
0.75
n / a
n / a
18-7 / 16
( 469 )
0.84
0.69
0.66
0.83
0.72
0.64
0.60
0.59
0.81
0.46
0.37
0.83
0.72
0.76
0.63
n / a
20
( 508 )
0.87
0.71
0.67
0.87
0.75
0.66
0.61
0.59
0.91
0.52
0.42
0.87
0.75
0.79
0.66
n / a
22-3 / 8
( 568 )
0.91
0.73
0.69
0.95
0.81
0.68
0.62
0.60
1.00
0.61
0.49
0.95
0.81
0.84
0.69
0.64
24
( 610 )
0.94
0.75
0.70
1.00
0.85
0.69
0.63
0.61
0.68
0.55
1.00
0.85
0.87
0.72
0.67
26
( 660 )
0.98
0.77
0.72
0.90
0.70
0.64
0.62
0.77
0.62
0.90
0.90
0.75
0.69
28
( 711 )
1.00
0.79
0.74
0.95
0.72
0.65
0.63
0.86
0.69
0.95
0.94
0.78
0.72
30
( 762 )
0.81
0.75
1.00
0.73
0.66
0.64
0.95
0.76
1.00
0.97
0.80
0.75
36
( 914 )
0.88
0.80
0.78
0.69
0.67
1.00
1.00
1.00
0.88
0.82
> 48
( 1219 )
1.00
0.90
0.88
0.76
0.72
1.00
0.94
1 Linear interpolation not permitted . 2 Shaded area with reduced edge distance is permitted provided the rebar has no installation torque . 3 When combining multiple load adjustment factors ( e . g . for a four-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 CSA A23.3 Annex D . 4 Spacing factor reduction in shear applicable when c < 3 * h ef
. ƒ AV , is applicable when edge distance , c < 3 * h ef
. If c ≥ 3 * h ef , then ƒ AV
= ƒ AN .
5 Concrete thickness reduction factor in shear , ƒ HV , is applicable when edge distance , c < 3 * h ef
. If c ≥ 3 * h ef , then ƒ HV
= 1.0 .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.2 HILTI HIT-HY 200 A / R V3 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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