Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 86

Table 79 — Load adjustment factors for 30M rebar in uncracked concrete 1 , 2 , 3
Edge distance in shear
30M 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
Spacing ( s ) / edge distance ( c a ) / concrete thickness ( h ), - in . ( mm )
Embedment h ef
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
in .
( mm )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.23
0.13
0.09
n / a
n / a
n / a
0.02
0.01
0.01
0.04
0.02
0.01
n / a
n / a
n / a
5-7 / 8
( 150 )
0.60
0.55
0.54
0.33
0.18
0.13
0.54
0.52
0.52
0.12
0.05
0.04
0.23
0.10
0.07
n / a
n / a
n / a
6
( 152 )
0.60
0.56
0.54
0.33
0.18
0.13
0.54
0.52
0.52
0.12
0.05
0.04
0.24
0.10
0.07
n / a
n / a
n / a
7
( 178 )
0.61
0.57
0.55
0.36
0.19
0.14
0.55
0.53
0.52
0.15
0.06
0.05
0.30
0.13
0.09
n / a
n / a
n / a
8
( 203 )
0.63
0.57
0.56
0.38
0.20
0.15
0.55
0.53
0.52
0.18
0.08
0.06
0.36
0.16
0.11
n / a
n / a
n / a
9
( 229 )
0.65
0.58
0.56
0.41
0.22
0.16
0.56
0.53
0.53
0.22
0.09
0.07
0.42
0.19
0.13
n / a
n / a
n / a
10
( 254 )
0.66
0.59
0.57
0.44
0.23
0.18
0.57
0.54
0.53
0.25
0.11
0.08
0.45
0.22
0.16
n / a
n / a
n / a
11
( 279 )
0.68
0.60
0.58
0.46
0.25
0.19
0.57
0.54
0.53
0.29
0.13
0.09
0.47
0.25
0.18
n / a
n / a
n / a
12
( 305 )
0.70
0.61
0.58
0.49
0.26
0.20
0.58
0.55
0.54
0.33
0.14
0.10
0.50
0.29
0.21
n / a
n / a
n / a
13-1 / 4
( 337 )
0.72
0.62
0.59
0.53
0.28
0.21
0.59
0.55
0.54
0.39
0.17
0.12
0.54
0.33
0.24
0.60
n / a
n / a
14
( 356 )
0.73
0.63
0.60
0.55
0.30
0.22
0.59
0.55
0.54
0.42
0.18
0.13
0.56
0.36
0.26
0.61
n / a
n / a
16
( 406 )
0.76
0.65
0.61
0.63
0.34
0.25
0.61
0.56
0.55
0.51
0.22
0.16
0.63
0.40
0.32
0.65
n / a
n / a
18
( 457 )
0.79
0.67
0.63
0.71
0.38
0.28
0.62
0.57
0.56
0.61
0.26
0.19
0.71
0.42
0.36
0.69
n / a
n / a
20
( 508 )
0.83
0.69
0.64
0.79
0.42
0.32
0.63
0.58
0.56
0.72
0.31
0.22
0.79
0.45
0.38
0.73
n / a
n / a
20-7 / 8
( 531 )
0.84
0.69
0.65
0.82
0.44
0.33
0.64
0.58
0.56
0.77
0.33
0.24
0.82
0.47
0.39
0.75
n / a
n / a
22
( 559 )
0.86
0.70
0.66
0.87
0.46
0.35
0.65
0.58
0.57
0.83
0.36
0.26
0.87
0.49
0.40
0.77
0.58
n / a
24
( 610 )
0.89
0.72
0.67
0.94
0.50
0.38
0.66
0.59
0.57
0.94
0.41
0.29
0.94
0.52
0.42
0.80
0.61
n / a
26-9 / 16
( 675 )
0.93
0.75
0.69
1.00
0.56
0.42
0.68
0.60
0.58
1.00
0.47
0.34
1.00
0.56
0.45
0.84
0.64
0.57
28
( 711 )
0.96
0.76
0.70
0.59
0.44
0.69
0.61
0.59
0.51
0.37
0.59
0.47
0.86
0.65
0.59
30
( 762 )
0.99
0.78
0.71
0.63
0.47
0.70
0.61
0.59
0.57
0.41
0.63
0.49
0.89
0.68
0.61
36
( 914 )
1.00
0.83
0.75
0.76
0.57
0.74
0.64
0.61
0.75
0.54
0.76
0.57
0.98
0.74
0.66
> 48
( 1219 )
0.95
0.84
1.00
0.76
0.82
0.68
0.65
1.00
0.83
1.00
0.76
1.00
0.86
0.77
Table 80 — Load adjustment factors for 30M rebar in cracked concrete 1 , 2 , 3
Edge distance in shear
30M 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
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
10-1 / 4
17-15 / 16
23-9 / 16
in .
( mm )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
( 260 )
( 455 )
( 598 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.41
0.38
0.38
n / a
n / a
n / a
0.02
0.01
0.01
0.04
0.02
0.02
n / a
n / a
n / a
5-7 / 8
( 150 )
0.60
0.55
0.54
0.56
0.47
0.44
0.54
0.53
0.52
0.12
0.06
0.05
0.23
0.12
0.09
n / a
n / a
n / a
6
( 152 )
0.60
0.56
0.54
0.57
0.47
0.44
0.54
0.53
0.52
0.12
0.06
0.05
0.24
0.13
0.10
n / a
n / a
n / a
7
( 178 )
0.61
0.57
0.55
0.61
0.49
0.46
0.55
0.53
0.53
0.15
0.08
0.06
0.30
0.16
0.12
n / a
n / a
n / a
8
( 203 )
0.63
0.57
0.56
0.65
0.51
0.47
0.55
0.54
0.53
0.19
0.10
0.07
0.37
0.19
0.15
n / a
n / a
n / a
9
( 229 )
0.65
0.58
0.56
0.69
0.53
0.49
0.56
0.54
0.53
0.22
0.12
0.09
0.44
0.23
0.18
n / a
n / a
n / a
10
( 254 )
0.66
0.59
0.57
0.74
0.56
0.50
0.57
0.54
0.54
0.26
0.14
0.10
0.52
0.27
0.21
n / a
n / a
n / a
11
( 279 )
0.68
0.60
0.58
0.79
0.58
0.52
0.57
0.55
0.54
0.30
0.16
0.12
0.60
0.31
0.24
n / a
n / a
n / a
12
( 305 )
0.70
0.61
0.58
0.83
0.60
0.54
0.58
0.55
0.54
0.34
0.18
0.14
0.68
0.36
0.27
n / a
n / a
n / a
13-1 / 4
( 337 )
0.72
0.62
0.59
0.89
0.63
0.56
0.59
0.56
0.55
0.40
0.21
0.16
0.79
0.41
0.32
0.60
n / a
n / a
14
( 356 )
0.73
0.63
0.60
0.93
0.65
0.57
0.59
0.56
0.55
0.43
0.22
0.17
0.86
0.45
0.34
0.62
n / a
n / a
16
( 406 )
0.76
0.65
0.61
1.00
0.70
0.61
0.61
0.57
0.56
0.52
0.27
0.21
1.00
0.55
0.42
0.66
n / a
n / a
18
( 457 )
0.79
0.67
0.63
0.75
0.64
0.62
0.58
0.57
0.62
0.33
0.25
0.65
0.50
0.70
n / a
n / a
20
( 508 )
0.83
0.69
0.64
0.81
0.68
0.64
0.59
0.57
0.73
0.38
0.29
0.77
0.58
0.74
n / a
n / a
20-7 / 8
( 531 )
0.84
0.69
0.65
0.83
0.70
0.64
0.59
0.58
0.78
0.41
0.31
0.82
0.62
0.75
n / a
n / a
22
( 559 )
0.86
0.70
0.66
0.86
0.72
0.65
0.60
0.58
0.84
0.44
0.34
0.86
0.67
0.77
0.62
n / a
24
( 610 )
0.89
0.72
0.67
0.92
0.76
0.66
0.61
0.59
0.96
0.50
0.38
0.92
0.76
0.81
0.65
n / a
26-9 / 16
( 675 )
0.93
0.75
0.69
0.99
0.81
0.68
0.62
0.60
1.00
0.59
0.45
0.99
0.81
0.85
0.68
0.62
28
( 711 )
0.96
0.76
0.70
1.00
0.84
0.69
0.62
0.60
0.63
0.48
1.00
0.84
0.87
0.70
0.64
30
( 762 )
0.99
0.78
0.71
0.88
0.70
0.63
0.61
0.70
0.54
0.88
0.90
0.73
0.66
36
( 914 )
1.00
0.83
0.75
1.00
0.74
0.66
0.63
0.93
0.70
1.00
0.99
0.80
0.73
> 48
( 1219 )
0.95
0.84
0.82
0.71
0.68
1.00
1.00
1.00
0.92
0.84
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 .
82 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