Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 84

Table 75 — Load adjustment factors for 20M rebar in uncracked concrete 1 , 2 , 3
Spacing ( s ) / edge distance ( c a
) / concrete thickness ( h ), - in . ( mm )
20M 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
Edge distance in shear
⃦ To and away from edge
ƒ RV
Concrete thickness factor in shear 5
ƒ HV
Embedment h ef
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
in .
( mm )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.21
0.11
0.10
n / a
n / a
n / a
0.03
0.01
0.01
0.06
0.03
0.03
n / a
n / a
n / a
3-7 / 8
( 98 )
0.58
0.55
0.54
0.27
0.15
0.13
0.53
0.52
0.52
0.09
0.05
0.04
0.18
0.10
0.09
n / a
n / a
n / a
4
( 102 )
0.58
0.55
0.54
0.27
0.15
0.13
0.53
0.52
0.52
0.10
0.05
0.05
0.19
0.10
0.09
n / a
n / a
n / a
5
( 127 )
0.61
0.56
0.55
0.30
0.17
0.15
0.54
0.53
0.53
0.13
0.07
0.07
0.27
0.14
0.13
n / a
n / a
n / a
6
( 152 )
0.63
0.57
0.57
0.34
0.18
0.17
0.55
0.53
0.53
0.17
0.09
0.09
0.35
0.19
0.17
n / a
n / a
n / a
7
( 178 )
0.65
0.58
0.58
0.37
0.20
0.18
0.56
0.54
0.54
0.22
0.12
0.11
0.41
0.24
0.22
n / a
n / a
n / a
8
( 203 )
0.67
0.60
0.59
0.41
0.22
0.20
0.57
0.55
0.54
0.27
0.15
0.13
0.44
0.29
0.26
n / a
n / a
n / a
9
( 229 )
0.69
0.61
0.60
0.45
0.24
0.22
0.58
0.55
0.55
0.32
0.17
0.16
0.47
0.33
0.32
n / a
n / a
n / a
10
( 254 )
0.71
0.62
0.61
0.49
0.27
0.24
0.59
0.56
0.55
0.38
0.20
0.18
0.51
0.35
0.33
0.59
n / a
n / a
11
( 279 )
0.73
0.63
0.62
0.54
0.29
0.27
0.60
0.56
0.56
0.43
0.23
0.21
0.55
0.37
0.35
0.62
n / a
n / a
12
( 305 )
0.75
0.64
0.63
0.59
0.32
0.29
0.60
0.57
0.56
0.49
0.27
0.24
0.59
0.38
0.36
0.65
n / a
n / a
14
( 356 )
0.80
0.67
0.65
0.69
0.37
0.34
0.62
0.58
0.58
0.62
0.34
0.31
0.69
0.42
0.40
0.70
n / a
n / a
16
( 406 )
0.84
0.69
0.67
0.78
0.43
0.39
0.64
0.59
0.59
0.76
0.41
0.37
0.78
0.46
0.43
0.74
0.61
n / a
18
( 457 )
0.88
0.71
0.70
0.88
0.48
0.44
0.66
0.60
0.60
0.91
0.49
0.45
0.88
0.50
0.46
0.79
0.64
0.62
20
( 508 )
0.92
0.74
0.72
0.98
0.53
0.48
0.67
0.62
0.61
1.00
0.57
0.52
0.98
0.54
0.50
0.83
0.68
0.66
22
( 559 )
0.97
0.76
0.74
1.00
0.59
0.53
0.69
0.63
0.62
0.66
0.60
1.00
0.59
0.54
0.87
0.71
0.69
24
( 610 )
1.00
0.79
0.76
0.64
0.58
0.71
0.64
0.63
0.76
0.69
0.64
0.58
0.91
0.74
0.72
26
( 660 )
0.81
0.78
0.69
0.63
0.73
0.65
0.64
0.85
0.78
0.69
0.63
0.95
0.77
0.75
28
( 711 )
0.83
0.80
0.75
0.68
0.74
0.66
0.65
0.95
0.87
0.75
0.68
0.99
0.80
0.78
30
( 762 )
0.86
0.83
0.80
0.73
0.76
0.67
0.66
1.00
0.96
0.80
0.73
1.00
0.83
0.81
36
( 914 )
0.93
0.89
0.96
0.87
0.81
0.71
0.69
1.00
0.96
0.87
0.91
0.88
> 48
( 1219 )
1.00
1.00
1.00
1.00
0.92
0.78
0.76
1.00
1.00
1.00
1.00
Table 76 — Load adjustment factors for 20M rebar in cracked concrete 1 , 2 , 3
Spacing ( s ) / edge distance ( c a
) / concrete thickness ( h ), - in . ( mm )
20M 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
Edge distance in shear
⃦ To and away from edge
ƒ RV
Concrete thickness factor in shear 5
ƒ HV
Embedment h ef
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
7-7 / 8
14
15-3 / 8
in .
( mm )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
( 200 )
( 355 )
( 390 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.43
0.39
0.39
n / a
n / a
n / a
0.03
0.02
0.01
0.06
0.03
0.03
n / a
n / a
n / a
3-7 / 8
( 98 )
0.58
0.55
0.54
0.53
0.45
0.44
0.53
0.52
0.52
0.09
0.05
0.05
0.18
0.10
0.09
n / a
n / a
n / a
4
( 102 )
0.58
0.55
0.54
0.54
0.45
0.44
0.54
0.52
0.52
0.10
0.05
0.05
0.19
0.10
0.10
n / a
n / a
n / a
5
( 127 )
0.61
0.56
0.55
0.59
0.48
0.47
0.54
0.53
0.53
0.14
0.07
0.07
0.27
0.15
0.13
n / a
n / a
n / a
6
( 152 )
0.63
0.57
0.57
0.64
0.51
0.49
0.55
0.53
0.53
0.18
0.10
0.09
0.36
0.19
0.17
n / a
n / a
n / a
7
( 178 )
0.65
0.58
0.58
0.70
0.53
0.52
0.56
0.54
0.54
0.22
0.12
0.11
0.45
0.24
0.22
n / a
n / a
n / a
8
( 203 )
0.67
0.60
0.59
0.76
0.56
0.54
0.57
0.55
0.54
0.27
0.15
0.13
0.55
0.30
0.27
n / a
n / a
n / a
9
( 229 )
0.69
0.61
0.60
0.82
0.59
0.57
0.58
0.55
0.55
0.33
0.18
0.16
0.65
0.35
0.32
n / a
n / a
n / a
10
( 254 )
0.71
0.62
0.61
0.88
0.62
0.60
0.59
0.56
0.55
0.38
0.21
0.19
0.77
0.41
0.38
0.59
n / a
n / a
11
( 279 )
0.73
0.63
0.62
0.95
0.65
0.62
0.60
0.56
0.56
0.44
0.24
0.22
0.88
0.48
0.43
0.62
n / a
n / a
12
( 305 )
0.75
0.64
0.63
1.00
0.69
0.65
0.61
0.57
0.57
0.50
0.27
0.25
1.00
0.54
0.49
0.65
n / a
n / a
14
( 356 )
0.80
0.67
0.65
0.75
0.71
0.62
0.58
0.58
0.64
0.34
0.31
0.68
0.62
0.70
n / a
n / a
16
( 406 )
0.84
0.69
0.67
0.82
0.77
0.64
0.59
0.59
0.77
0.42
0.38
0.82
0.76
0.75
0.61
n / a
18
( 457 )
0.88
0.71
0.70
0.89
0.83
0.66
0.60
0.60
0.93
0.50
0.45
0.89
0.83
0.80
0.65
0.63
20
( 508 )
0.92
0.74
0.72
0.96
0.90
0.68
0.62
0.61
1.00
0.58
0.53
0.96
0.90
0.84
0.68
0.66
22
( 559 )
0.97
0.76
0.74
1.00
0.96
0.69
0.63
0.62
0.67
0.61
1.00
0.96
0.88
0.72
0.69
24
( 610 )
1.00
0.79
0.76
1.00
0.71
0.64
0.63
0.77
0.70
1.00
0.92
0.75
0.72
26
( 660 )
0.81
0.78
0.73
0.65
0.64
0.87
0.79
0.96
0.78
0.75
28
( 711 )
0.83
0.80
0.75
0.66
0.65
0.97
0.88
0.99
0.81
0.78
30
( 762 )
0.86
0.83
0.76
0.67
0.66
1.00
0.98
1.00
0.84
0.81
36
( 914 )
0.93
0.89
0.82
0.71
0.70
1.00
0.92
0.89
> 48
( 1219 )
1.00
1.00
0.92
0.78
0.76
1.00
1.00
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 .
80 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