Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 83

Anchor Fastening Technical Guide , Edition 22
Table 73 — Load adjustment factors for 15M rebar in uncracked concrete 1 , 2 , 3
Edge distance in shear
15M 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
Embedment h ef
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
in .
( mm )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.25
0.14
0.11
n / a
n / a
n / a
0.04
0.02
0.02
0.08
0.05
0.04
n / a
n / a
n / a
3-1 / 8
( 80 )
0.59
0.55
0.54
0.31
0.17
0.13
0.54
0.53
0.52
0.10
0.06
0.05
0.20
0.12
0.09
n / a
n / a
n / a
4
( 102 )
0.62
0.57
0.55
0.35
0.19
0.15
0.55
0.53
0.53
0.14
0.08
0.07
0.29
0.17
0.13
n / a
n / a
n / a
5
( 127 )
0.65
0.58
0.57
0.39
0.22
0.17
0.56
0.54
0.53
0.20
0.12
0.09
0.40
0.23
0.18
n / a
n / a
n / a
6
( 152 )
0.68
0.60
0.58
0.44
0.25
0.19
0.57
0.55
0.54
0.27
0.15
0.12
0.45
0.31
0.24
n / a
n / a
n / a
7
( 178 )
0.70
0.62
0.59
0.49
0.27
0.21
0.58
0.56
0.55
0.33
0.19
0.15
0.50
0.35
0.30
n / a
n / a
n / a
7-1 / 4
( 184 )
0.71
0.62
0.60
0.50
0.28
0.22
0.58
0.56
0.55
0.35
0.20
0.16
0.51
0.35
0.31
0.58
n / a
n / a
8
( 203 )
0.73
0.64
0.61
0.54
0.30
0.24
0.59
0.56
0.55
0.41
0.24
0.18
0.55
0.37
0.33
0.61
n / a
n / a
9
( 229 )
0.76
0.65
0.62
0.61
0.34
0.26
0.60
0.57
0.56
0.49
0.28
0.22
0.61
0.40
0.35
0.64
n / a
n / a
10
( 254 )
0.79
0.67
0.63
0.68
0.38
0.29
0.61
0.58
0.57
0.57
0.33
0.26
0.68
0.43
0.37
0.68
n / a
n / a
11-3 / 8 ( 289 )
0.83
0.69
0.65
0.77
0.43
0.33
0.63
0.59
0.58
0.69
0.40
0.31
0.77
0.46
0.39
0.72
0.60
n / a
12
( 305 )
0.85
0.70
0.66
0.81
0.46
0.35
0.64
0.60
0.58
0.75
0.43
0.34
0.81
0.48
0.40
0.74
0.62
n / a
14-1 / 8 ( 359 )
0.91
0.74
0.69
0.96
0.54
0.42
0.66
0.61
0.60
0.96
0.55
0.43
0.96
0.54
0.45
0.81
0.67
0.62
16
( 406 )
0.97
0.77
0.71
1.00
0.61
0.47
0.68
0.63
0.61
1.00
0.67
0.52
1.00
0.61
0.49
0.86
0.71
0.66
18
( 457 )
1.00
0.80
0.74
0.68
0.53
0.71
0.64
0.62
0.80
0.62
0.68
0.54
0.91
0.76
0.70
20
( 508 )
0.84
0.76
0.76
0.59
0.73
0.66
0.63
0.93
0.73
0.76
0.59
0.96
0.80
0.73
22
( 559 )
0.87
0.79
0.84
0.65
0.75
0.67
0.65
1.00
0.84
0.84
0.65
1.00
0.84
0.77
24
( 610 )
0.91
0.82
0.91
0.71
0.78
0.69
0.66
0.96
0.91
0.71
0.87
0.80
30
( 762 )
1.00
0.90
1.00
0.88
0.84
0.74
0.70
1.00
1.00
0.88
0.98
0.90
36
( 914 )
0.98
1.00
0.91
0.79
0.74
1.00
1.00
0.99
> 48
( 1219 )
1.00
1.00
0.88
0.82
1.00
Spacing ( s ) / edge distance ( c a ) / concrete thickness ( h ), - in . ( mm )
Table 74 — Load adjustment factors for 15M rebar in cracked concrete 1 , 2 , 3
Edge distance in shear
15M 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
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
5-11 / 16 9-13 / 16
12-5 / 8
in .
( mm )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
( 145 )
( 250 )
( 320 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.46
0.41
0.40
n / a
n / a
n / a
0.04
0.02
0.02
0.09
0.05
0.04
n / a
n / a
n / a
3-1 / 8
( 80 )
0.59
0.55
0.54
0.55
0.46
0.44
0.54
0.53
0.52
0.10
0.06
0.05
0.21
0.12
0.09
n / a
n / a
n / a
4
( 102 )
0.62
0.57
0.55
0.62
0.50
0.46
0.55
0.53
0.53
0.15
0.09
0.07
0.30
0.17
0.13
n / a
n / a
n / a
5
( 127 )
0.65
0.58
0.57
0.69
0.54
0.49
0.56
0.54
0.53
0.21
0.12
0.09
0.41
0.24
0.19
n / a
n / a
n / a
6
( 152 )
0.68
0.60
0.58
0.77
0.58
0.52
0.57
0.55
0.54
0.27
0.16
0.12
0.54
0.31
0.25
n / a
n / a
n / a
7
( 178 )
0.70
0.62
0.59
0.86
0.62
0.56
0.58
0.56
0.55
0.34
0.20
0.15
0.68
0.40
0.31
n / a
n / a
n / a
7-1 / 4
( 184 )
0.71
0.62
0.60
0.88
0.63
0.56
0.58
0.56
0.55
0.36
0.21
0.16
0.72
0.42
0.33
0.58
n / a
n / a
8
( 203 )
0.73
0.64
0.61
0.95
0.66
0.59
0.59
0.56
0.55
0.42
0.24
0.19
0.84
0.48
0.38
0.61
n / a
n / a
9
( 229 )
0.76
0.65
0.62
1.00
0.71
0.62
0.60
0.57
0.56
0.50
0.29
0.23
1.00
0.58
0.45
0.65
n / a
n / a
10
( 254 )
0.79
0.67
0.63
0.76
0.66
0.62
0.58
0.57
0.58
0.34
0.26
0.68
0.53
0.68
n / a
n / a
11-3 / 8
( 289 )
0.83
0.69
0.65
0.82
0.71
0.63
0.59
0.58
0.71
0.41
0.32
0.82
0.64
0.73
0.61
n / a
12
( 305 )
0.85
0.70
0.66
0.86
0.73
0.64
0.60
0.58
0.77
0.44
0.35
0.86
0.70
0.75
0.62
n / a
14-1 / 8
( 359 )
0.91
0.74
0.69
0.97
0.81
0.66
0.61
0.60
0.98
0.57
0.44
0.97
0.81
0.81
0.68
0.62
16
( 406 )
0.97
0.77
0.71
1.00
0.88
0.69
0.63
0.61
1.00
0.69
0.54
1.00
0.88
0.86
0.72
0.66
18
( 457 )
1.00
0.80
0.74
0.96
0.71
0.65
0.62
0.82
0.64
0.96
0.92
0.76
0.70
20
( 508 )
0.84
0.76
1.00
0.73
0.66
0.64
0.96
0.75
1.00
0.96
0.80
0.74
22
( 559 )
0.87
0.79
0.76
0.68
0.65
1.00
0.86
1.00
0.84
0.78
24
( 610 )
0.91
0.82
0.78
0.69
0.66
0.98
0.88
0.81
30
( 762 )
1.00
0.90
0.85
0.74
0.71
1.00
0.99
0.91
36
( 914 )
0.98
0.92
0.79
0.75
1.00
0.99
> 48
( 1219 )
1.00
1.00
0.89
0.83
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 .
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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