Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 53

Anchor Fastening Technical Guide , Edition 22
Table 22 — Load adjustment factors for # 3 rebar in uncracked concrete 1 , 2 , 3
Edge distance in shear
# 3 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
Embedment h ef
in .
( mm )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.31
0.23
0.13
n / a
n / a
n / a
0.08
0.06
0.04
0.17
0.13
0.08
n / a
n / a
n / a
1-7 / 8
( 48 )
0.59
0.57
0.54
0.32
0.23
0.13
0.53
0.53
0.52
0.09
0.07
0.04
0.19
0.14
0.08
n / a
n / a
n / a
2
( 51 )
0.60
0.57
0.54
0.33
0.24
0.14
0.54
0.53
0.52
0.10
0.08
0.05
0.21
0.16
0.09
n / a
n / a
n / a
3
( 76 )
0.65
0.61
0.57
0.41
0.30
0.17
0.56
0.55
0.53
0.19
0.14
0.09
0.38
0.29
0.17
n / a
n / a
n / a
4
( 102 )
0.70
0.65
0.59
0.49
0.36
0.21
0.57
0.56
0.54
0.29
0.22
0.13
0.50
0.41
0.26
n / a
n / a
n / a
4-5 / 8
( 117 )
0.73
0.67
0.60
0.55
0.40
0.23
0.59
0.57
0.55
0.36
0.27
0.16
0.56
0.45
0.33
0.58
n / a
n / a
5
( 127 )
0.75
0.69
0.61
0.59
0.43
0.25
0.59
0.58
0.55
0.41
0.31
0.18
0.60
0.47
0.34
0.61
n / a
n / a
5-3 / 4
( 146 )
0.78
0.71
0.63
0.68
0.50
0.29
0.61
0.59
0.56
0.51
0.38
0.23
0.68
0.52
0.36
0.65
0.59
n / a
6
( 152 )
0.80
0.72
0.63
0.71
0.52
0.30
0.61
0.59
0.56
0.54
0.40
0.24
0.71
0.53
0.37
0.66
0.60
n / a
7
( 178 )
0.85
0.76
0.66
0.83
0.61
0.35
0.63
0.61
0.58
0.68
0.51
0.31
0.83
0.61
0.41
0.72
0.65
n / a
8
( 203 )
0.90
0.80
0.68
0.95
0.69
0.40
0.65
0.62
0.59
0.83
0.62
0.37
0.95
0.69
0.44
0.77
0.70
n / a
8-3 / 4
( 222 )
0.93
0.82
0.69
1.00
0.76
0.44
0.66
0.63
0.59
0.95
0.71
0.43
1.00
0.76
0.47
0.80
0.73
0.61
9
( 229 )
0.94
0.83
0.70
0.78
0.45
0.67
0.64
0.60
0.99
0.74
0.45
0.78
0.48
0.81
0.74
0.62
10
( 254 )
0.99
0.87
0.72
0.86
0.50
0.68
0.65
0.61
1.00
0.87
0.52
0.86
0.51
0.86
0.78
0.66
11
( 279 )
1.00
0.91
0.74
0.95
0.55
0.70
0.67
0.62
1.00
0.60
0.95
0.55
0.90
0.82
0.69
12
( 305 )
0.94
0.77
1.00
0.60
0.72
0.68
0.63
0.69
1.00
0.60
0.94
0.85
0.72
14
( 356 )
1.00
0.81
0.70
0.76
0.71
0.65
0.86
0.70
1.00
0.92
0.78
16
( 406 )
0.86
0.80
0.79
0.74
0.67
1.00
0.80
0.99
0.83
18
( 457 )
0.90
0.90
0.83
0.77
0.69
0.90
1.00
0.88
24
( 610 )
1.00
1.00
0.94
0.86
0.76
1.00
1.00
30
( 762 )
1.00
0.96
0.82
36
( 914 )
1.00
0.89
> 48
( 1219 )
1.00
Spacing ( s ) / Edge distance ( c a ) / Concrete thickness ( h ), - in . ( mm ) ƒ HV
3.2.2
Table 23 — Load adjustment factors for # 3 rebar in cracked concrete 1 , 2 , 3
# 3 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
Embedment h ef
in .
( mm )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
3-3 / 8
( 86 )
4-1 / 2
( 114 )
7-1 / 2
( 191 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.54
0.49
0.43
n / a
n / a
n / a
0.09
0.07
0.04
0.18
0.13
0.08
n / a
n / a
n / a
1-7 / 8
( 48 )
0.59
0.57
0.54
0.56
0.50
0.44
0.54
0.53
0.52
0.10
0.07
0.04
0.19
0.15
0.09
n / a
n / a
n / a
2
( 51 )
0.60
0.57
0.54
0.57
0.51
0.44
0.54
0.53
0.52
0.11
0.08
0.05
0.21
0.16
0.10
n / a
n / a
n / a
3
( 76 )
0.65
0.61
0.57
0.70
0.60
0.49
0.56
0.55
0.53
0.20
0.15
0.09
0.39
0.29
0.18
n / a
n / a
n / a
4
( 102 )
0.70
0.65
0.59
0.84
0.70
0.55
0.58
0.56
0.54
0.30
0.23
0.14
0.61
0.45
0.27
n / a
n / a
n / a
4-5 / 8
( 117 )
0.73
0.67
0.60
0.93
0.76
0.58
0.59
0.57
0.55
0.38
0.28
0.17
0.75
0.56
0.34
0.59
n / a
n / a
5
( 127 )
0.75
0.69
0.61
0.99
0.80
0.60
0.59
0.58
0.56
0.42
0.32
0.19
0.85
0.63
0.38
0.61
n / a
n / a
5-3 / 4
( 146 )
0.78
0.71
0.63
1.00
0.88
0.64
0.61
0.59
0.56
0.52
0.39
0.23
1.00
0.78
0.47
0.66
0.60
n / a
6
( 152 )
0.80
0.72
0.63
0.91
0.66
0.61
0.59
0.57
0.56
0.42
0.25
0.83
0.50
0.67
0.61
n / a
7
( 178 )
0.85
0.76
0.66
1.00
0.72
0.63
0.61
0.58
0.70
0.53
0.32
1.00
0.63
0.73
0.66
n / a
8
( 203 )
0.90
0.80
0.68
0.78
0.65
0.62
0.59
0.86
0.64
0.39
0.77
0.78
0.70
n / a
8-3 / 4
( 222 )
0.93
0.82
0.69
0.83
0.66
0.64
0.60
0.98
0.73
0.44
0.83
0.81
0.74
0.62
9
( 229 )
0.94
0.83
0.70
0.85
0.67
0.64
0.60
1.00
0.77
0.46
0.85
0.82
0.75
0.63
10
( 254 )
0.99
0.87
0.72
0.91
0.69
0.66
0.61
0.90
0.54
0.91
0.87
0.79
0.66
11
( 279 )
1.00
0.91
0.74
0.98
0.71
0.67
0.62
1.00
0.62
0.98
0.91
0.83
0.70
12
( 305 )
0.94
0.77
1.00
0.73
0.69
0.63
0.71
1.00
0.95
0.86
0.73
14
( 356 )
1.00
0.81
0.76
0.72
0.65
0.89
1.00
0.93
0.79
16
( 406 )
0.86
0.80
0.75
0.68
1.00
1.00
0.84
18
( 457 )
0.90
0.84
0.78
0.70
0.89
24
( 610 )
1.00
0.95
0.87
0.76
1.00
30
( 762 )
1.00
0.97
0.83
36
( 914 )
1.00
0.90
> 48
( 1219 )
1.00
Spacing ( s ) / Edge distance ( c a
) / Concrete thickness ( h ), - in . ( mm )
1 Linear interpolation not permitted . 2 Shaded area with reduced edge distance is permitted provided 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 ACI 318 Chapter 17 . 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 . ƒ HV
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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