Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 55

Anchor Fastening Technical Guide , Edition 22
Table 26 — Load adjustment factors for # 5 rebar in uncracked concrete 1 , 2 , 3
Edge distance in shear
# 5 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 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.25
0.18
0.11
n / a
n / a
n / a
0.04
0.03
0.02
0.08
0.06
0.04
n / a
n / a
n / a
3-1 / 8
( 79 )
0.59
0.57
0.54
0.31
0.23
0.13
0.54
0.53
0.52
0.10
0.07
0.04
0.20
0.14
0.08
n / a
n / a
n / a
4
( 102 )
0.62
0.59
0.55
0.35
0.25
0.15
0.55
0.54
0.53
0.15
0.10
0.06
0.29
0.20
0.12
n / a
n / a
n / a
5
( 127 )
0.65
0.61
0.57
0.39
0.29
0.17
0.56
0.55
0.53
0.21
0.14
0.09
0.41
0.29
0.17
n / a
n / a
n / a
6
( 152 )
0.68
0.63
0.58
0.44
0.32
0.19
0.57
0.55
0.54
0.27
0.19
0.11
0.45
0.38
0.23
n / a
n / a
n / a
7
( 178 )
0.71
0.66
0.59
0.49
0.36
0.21
0.58
0.56
0.55
0.34
0.24
0.14
0.50
0.41
0.28
n / a
n / a
n / a
7-1 / 8
( 181 )
0.71
0.66
0.60
0.50
0.37
0.22
0.58
0.56
0.55
0.35
0.24
0.15
0.51
0.41
0.29
0.57
n / a
n / a
8
( 203 )
0.74
0.68
0.61
0.55
0.40
0.24
0.59
0.57
0.55
0.41
0.29
0.17
0.56
0.44
0.33
0.61
n / a
n / a
9
( 229 )
0.77
0.70
0.62
0.62
0.46
0.27
0.60
0.58
0.56
0.50
0.35
0.21
0.62
0.48
0.35
0.65
0.57
n / a
10
( 254 )
0.80
0.72
0.63
0.69
0.51
0.30
0.62
0.59
0.56
0.58
0.40
0.24
0.69
0.52
0.37
0.68
0.60
n / a
11
( 279 )
0.83
0.74
0.65
0.76
0.56
0.33
0.63
0.60
0.57
0.67
0.47
0.28
0.76
0.56
0.39
0.71
0.63
n / a
12
( 305 )
0.86
0.77
0.66
0.83
0.61
0.36
0.64
0.61
0.58
0.76
0.53
0.32
0.83
0.61
0.41
0.75
0.66
n / a
14
( 356 )
0.91
0.81
0.69
0.96
0.71
0.41
0.66
0.63
0.59
0.96
0.67
0.40
0.96
0.71
0.45
0.81
0.71
0.60
16
( 406 )
0.97
0.86
0.71
1.00
0.81
0.47
0.69
0.65
0.60
1.00
0.82
0.49
1.00
0.81
0.49
0.86
0.76
0.64
18
( 457 )
1.00
0.90
0.74
0.91
0.53
0.71
0.66
0.62
0.98
0.59
0.91
0.54
0.91
0.81
0.68
20
( 508 )
0.94
0.77
1.00
0.59
0.73
0.68
0.63
1.00
0.69
1.00
0.59
0.96
0.85
0.72
22
( 559 )
0.99
0.79
0.65
0.75
0.70
0.64
0.79
0.65
1.00
0.90
0.76
24
( 610 )
1.00
0.82
0.71
0.78
0.72
0.66
0.90
0.71
0.94
0.79
26
( 660 )
0.85
0.77
0.80
0.74
0.67
1.00
0.77
0.97
0.82
28
( 711 )
0.87
0.83
0.82
0.76
0.68
0.83
1.00
0.85
30
( 762 )
0.90
0.89
0.85
0.77
0.69
0.89
0.88
36
( 914 )
0.98
1.00
0.92
0.83
0.73
1.00
0.97
> 48
( 1219 )
1.00
1.00
0.94
0.81
1.00
Spacing ( s ) / Edge distance ( c a ) / Concrete thickness ( h ), - in . ( mm ) ƒ HV
3.2.2
Table 27 — Load adjustment factors for # 5 rebar in cracked concrete 1 , 2 , 3
# 5 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 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
5-5 / 8
( 143 )
7-1 / 2
( 191 )
12-1 / 2
( 318 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.46
0.43
0.40
n / a
n / a
n / a
0.04
0.03
0.02
0.09
0.06
0.04
n / a
n / a
n / a
3-1 / 8
( 79 )
0.59
0.57
0.54
0.56
0.50
0.44
0.54
0.53
0.52
0.10
0.07
0.04
0.20
0.14
0.09
n / a
n / a
n / a
4
( 102 )
0.62
0.59
0.55
0.62
0.55
0.46
0.55
0.54
0.53
0.15
0.10
0.06
0.30
0.21
0.13
n / a
n / a
n / a
5
( 127 )
0.65
0.61
0.57
0.70
0.60
0.49
0.56
0.55
0.53
0.21
0.15
0.09
0.41
0.29
0.18
n / a
n / a
n / a
6
( 152 )
0.68
0.63
0.58
0.78
0.66
0.53
0.57
0.56
0.54
0.27
0.19
0.12
0.54
0.38
0.23
n / a
n / a
n / a
7
( 178 )
0.71
0.66
0.59
0.87
0.72
0.56
0.58
0.56
0.55
0.34
0.24
0.15
0.68
0.48
0.29
n / a
n / a
n / a
7-1 / 8
( 181 )
0.71
0.66
0.60
0.88
0.73
0.56
0.58
0.57
0.55
0.35
0.25
0.15
0.70
0.50
0.30
0.58
n / a
n / a
8
( 203 )
0.74
0.68
0.61
0.96
0.78
0.59
0.59
0.57
0.55
0.42
0.30
0.18
0.84
0.59
0.35
0.61
n / a
n / a
9
( 229 )
0.77
0.70
0.62
1.00
0.85
0.62
0.60
0.58
0.56
0.50
0.35
0.21
1.00
0.71
0.42
0.65
0.58
n / a
10
( 254 )
0.80
0.72
0.63
0.91
0.66
0.62
0.59
0.57
0.58
0.41
0.25
0.83
0.50
0.68
0.61
n / a
11
( 279 )
0.83
0.74
0.65
0.98
0.69
0.63
0.60
0.57
0.67
0.48
0.29
0.95
0.57
0.72
0.64
n / a
12
( 305 )
0.86
0.77
0.66
1.00
0.73
0.64
0.61
0.58
0.77
0.54
0.33
1.00
0.65
0.75
0.67
n / a
14
( 356 )
0.91
0.81
0.69
0.81
0.66
0.63
0.59
0.97
0.68
0.41
0.81
0.81
0.72
0.61
16
( 406 )
0.97
0.86
0.71
0.89
0.69
0.65
0.61
1.00
0.84
0.50
0.89
0.86
0.77
0.65
18
( 457 )
1.00
0.90
0.74
0.97
0.71
0.67
0.62
1.00
0.60
0.97
0.92
0.82
0.69
20
( 508 )
0.94
0.77
1.00
0.73
0.68
0.63
0.70
1.00
0.97
0.86
0.73
22
( 559 )
0.99
0.79
0.76
0.70
0.64
0.81
1.00
0.90
0.76
24
( 610 )
1.00
0.82
0.78
0.72
0.66
0.92
0.94
0.79
26
( 660 )
0.85
0.80
0.74
0.67
1.00
0.98
0.83
28
( 711 )
0.87
0.83
0.76
0.68
1.00
0.86
30
( 762 )
0.90
0.85
0.78
0.70
0.89
36
( 914 )
0.98
0.92
0.83
0.74
0.97
> 48
( 1219 )
1.00
1.00
0.94
0.82
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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