Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 54

Table 24 — Load adjustment factors for # 4 rebar in uncracked concrete 1 , 2 , 3
# 4 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
Embedment h ef
in .
( mm )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.27
0.20
0.12
n / a
n / a
n / a
0.06
0.04
0.02
0.11
0.08
0.05
n / a
n / a
n / a
2-1 / 2
( 64 )
0.59
0.57
0.54
0.31
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
3
( 76 )
0.61
0.58
0.55
0.34
0.25
0.14
0.54
0.53
0.52
0.12
0.09
0.06
0.25
0.19
0.11
n / a
n / a
n / a
4
( 102 )
0.65
0.61
0.57
0.39
0.29
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
5
( 127 )
0.69
0.64
0.58
0.46
0.33
0.20
0.57
0.56
0.54
0.27
0.20
0.12
0.47
0.38
0.24
n / a
n / a
n / a
5-3 / 4
( 146 )
0.71
0.66
0.60
0.51
0.37
0.22
0.58
0.57
0.55
0.33
0.25
0.15
0.52
0.42
0.30
0.56
n / a
n / a
6
( 152 )
0.72
0.67
0.60
0.52
0.38
0.22
0.58
0.57
0.55
0.35
0.26
0.16
0.53
0.43
0.31
0.58
n / a
n / a
7
( 178 )
0.76
0.69
0.62
0.61
0.44
0.26
0.60
0.58
0.56
0.44
0.33
0.20
0.61
0.47
0.34
0.62
n / a
n / a
7-1 / 4
( 184 )
0.77
0.70
0.62
0.63
0.46
0.27
0.60
0.58
0.56
0.46
0.35
0.21
0.63
0.49
0.35
0.63
0.57
n / a
8
( 203 )
0.80
0.72
0.63
0.69
0.51
0.30
0.61
0.59
0.56
0.54
0.40
0.24
0.69
0.52
0.37
0.66
0.60
n / a
9
( 229 )
0.83
0.75
0.65
0.78
0.57
0.33
0.62
0.60
0.57
0.64
0.48
0.29
0.78
0.57
0.39
0.70
0.64
n / a
10
( 254 )
0.87
0.78
0.67
0.86
0.63
0.37
0.64
0.61
0.58
0.75
0.56
0.34
0.86
0.63
0.42
0.74
0.67
n / a
11-1 / 4
( 286 )
0.92
0.81
0.69
0.97
0.71
0.42
0.66
0.63
0.59
0.90
0.67
0.40
0.97
0.71
0.45
0.79
0.72
0.60
12
( 305 )
0.94
0.83
0.70
1.00
0.76
0.45
0.67
0.64
0.60
0.99
0.74
0.45
1.00
0.76
0.47
0.81
0.74
0.62
14
( 356 )
1.00
0.89
0.73
0.89
0.52
0.69
0.66
0.61
1.00
0.94
0.56
0.89
0.53
0.88
0.80
0.67
16
( 406 )
0.94
0.77
1.00
0.59
0.72
0.68
0.63
1.00
0.69
1.00
0.59
0.94
0.85
0.72
18
( 457 )
1.00
0.80
0.67
0.75
0.70
0.65
0.82
0.67
1.00
0.91
0.76
20
( 508 )
0.83
0.74
0.78
0.73
0.66
0.96
0.74
0.95
0.81
22
( 559 )
0.87
0.82
0.80
0.75
0.68
1.00
0.82
1.00
0.84
24
( 610 )
0.90
0.89
0.83
0.77
0.69
0.89
0.88
30
( 762 )
1.00
1.00
0.91
0.84
0.74
1.00
0.99
36
( 914 )
1.00
0.91
0.79
1.00
> 48
( 1219 )
1.00
0.89
Spacing ( s ) / Edge distance ( c a ) / Concrete thickness ( h ), - in . ( mm ) ƒ HV
Table 25 — Load adjustment factors for # 4 rebar in cracked concrete 1 , 2 , 3
# 4 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 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
4-1 / 2
( 114 )
6
( 152 )
10
( 254 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.49
0.45
0.41
n / a
n / a
n / a
0.06
0.04
0.03
0.11
0.09
0.05
n / a
n / a
n / a
2-1 / 2
( 64 )
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
3
( 76 )
0.61
0.58
0.55
0.60
0.53
0.46
0.54
0.53
0.52
0.13
0.10
0.06
0.26
0.19
0.11
n / a
n / a
n / a
4
( 102 )
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
5
( 127 )
0.69
0.64
0.58
0.80
0.67
0.53
0.57
0.56
0.54
0.27
0.21
0.12
0.55
0.41
0.25
n / a
n / a
n / a
5-3 / 4
( 146 )
0.71
0.66
0.60
0.88
0.73
0.56
0.58
0.57
0.55
0.34
0.25
0.15
0.68
0.51
0.30
0.57
n / a
n / a
6
( 152 )
0.72
0.67
0.60
0.91
0.75
0.57
0.58
0.57
0.55
0.36
0.27
0.16
0.72
0.54
0.32
0.58
n / a
n / a
7
( 178 )
0.76
0.69
0.62
1.00
0.83
0.62
0.60
0.58
0.56
0.46
0.34
0.20
0.91
0.68
0.41
0.63
n / a
n / a
7-1 / 4
( 184 )
0.77
0.70
0.62
0.85
0.63
0.60
0.58
0.56
0.48
0.36
0.22
0.96
0.72
0.43
0.64
0.58
n / a
8
( 203 )
0.80
0.72
0.63
0.91
0.66
0.61
0.59
0.57
0.56
0.42
0.25
1.00
0.83
0.50
0.67
0.61
n / a
9
( 229 )
0.83
0.75
0.65
1.00
0.70
0.63
0.60
0.57
0.66
0.50
0.30
1.00
0.60
0.71
0.65
n / a
10
( 254 )
0.87
0.78
0.67
0.75
0.64
0.62
0.58
0.78
0.58
0.35
0.70
0.75
0.68
n / a
11-1 / 4
( 286 )
0.92
0.81
0.69
0.81
0.66
0.63
0.59
0.93
0.70
0.42
0.81
0.80
0.72
0.61
12
( 305 )
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
14
( 356 )
1.00
0.89
0.73
0.95
0.70
0.66
0.62
0.97
0.58
0.95
0.89
0.81
0.68
16
( 406 )
0.94
0.77
1.00
0.73
0.69
0.63
1.00
0.71
1.00
0.95
0.86
0.73
18
( 457 )
1.00
0.80
0.75
0.71
0.65
0.84
1.00
0.91
0.77
20
( 508 )
0.83
0.78
0.73
0.67
0.99
0.96
0.81
22
( 559 )
0.87
0.81
0.76
0.68
1.00
1.00
0.85
24
( 610 )
0.90
0.84
0.78
0.70
0.89
30
( 762 )
1.00
0.92
0.85
0.75
1.00
36
( 914 )
1.00
0.92
0.80
> 48
( 1219 )
1.00
0.90
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
50 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