Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 216

Table 25 — Load adjustment factors for # 5 rebar in uncracked concrete 1 , 2 , 3
# 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
Edge distance in shear
⃦ To 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
0.26
0.19
0.11
n / a
n / a
n / a
0.06
0.05
0.03
0.12
0.09
0.06
n / a
n / a
n / a
3-1 / 8
( 79 )
0.59
0.57
0.54
0.33
0.24
0.14
0.55
0.54
0.53
0.15
0.11
0.07
0.30
0.22
0.13
n / a
n / a
n / a
4
( 102 )
0.62
0.59
0.55
0.38
0.28
0.16
0.56
0.55
0.54
0.21
0.16
0.10
0.38
0.28
0.16
n / a
n / a
n / a
5
( 127 )
0.65
0.61
0.57
0.44
0.32
0.19
0.57
0.56
0.54
0.30
0.23
0.14
0.44
0.32
0.19
n / a
n / a
n / a
6
( 152 )
0.68
0.63
0.58
0.50
0.37
0.21
0.59
0.57
0.55
0.39
0.30
0.18
0.50
0.37
0.21
n / a
n / a
n / a
7
( 178 )
0.71
0.66
0.59
0.58
0.42
0.25
0.60
0.59
0.56
0.50
0.37
0.22
0.58
0.42
0.25
n / a
n / a
n / a
7-1 / 8
( 181 )
0.71
0.66
0.60
0.59
0.43
0.25
0.61
0.59
0.56
0.51
0.38
0.23
0.59
0.43
0.25
0.65
n / a
n / a
8
( 203 )
0.74
0.68
0.61
0.66
0.49
0.28
0.62
0.60
0.57
0.61
0.46
0.27
0.66
0.49
0.28
0.69
n / a
n / a
9
( 229 )
0.77
0.70
0.62
0.74
0.55
0.32
0.63
0.61
0.58
0.72
0.54
0.33
0.74
0.55
0.32
0.73
0.67
n / a
10
( 254 )
0.80
0.72
0.63
0.83
0.61
0.36
0.65
0.62
0.59
0.85
0.64
0.38
0.83
0.61
0.36
0.77
0.70
n / a
11
( 279 )
0.83
0.74
0.65
0.91
0.67
0.39
0.66
0.64
0.60
0.98
0.73
0.44
0.91
0.67
0.39
0.81
0.74
n / a
12
( 305 )
0.86
0.77
0.66
0.99
0.73
0.43
0.68
0.65
0.61
1.00
0.84
0.50
0.99
0.73
0.43
0.85
0.77
n / a
14
( 356 )
0.91
0.81
0.69
1.00
0.85
0.50
0.71
0.67
0.62
1.00
0.63
1.00
0.85
0.50
0.91
0.83
0.70
16
( 406 )
0.97
0.86
0.71
0.97
0.57
0.74
0.70
0.64
0.77
0.97
0.57
0.98
0.89
0.75
18
( 457 )
1.00
0.90
0.74
1.00
0.64
0.77
0.72
0.66
0.92
1.00
0.64
1.00
0.94
0.79
20
( 508 )
0.94
0.77
0.71
0.80
0.75
0.68
1.00
0.71
0.99
0.84
22
( 559 )
0.99
0.79
0.78
0.83
0.77
0.69
0.78
1.00
0.88
24
( 610 )
1.00
0.82
0.85
0.86
0.80
0.71
0.85
0.92
26
( 660 )
0.85
0.92
0.89
0.82
0.73
0.92
0.96
28
( 711 )
0.87
1.00
0.92
0.85
0.75
1.00
0.99
30
( 762 )
0.90
0.95
0.87
0.76
1.00
36
( 914 )
0.98
1.00
0.94
0.82
> 48
( 1219 )
1.00
1.00
0.92
Spacing ( s ) / Edge distance ( c a ) / Concrete thickness ( h ), - in . ( mm ) ƒ HV
Table 26 — Load adjustment factors for # 6 rebar in uncracked concrete 1 , 2 , 3
# 6 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 edge
ƒ RV
Concrete thickness factor in shear 5
Embedment h ef
in .
( mm )
6-3 / 4
( 171 )
9
( 229 )
15
( 381 )
6-3 / 4
( 171 )
9
( 229 )
15
( 381 )
6-3 / 4
( 171 )
9
( 229 )
15
( 381 )
6-3 / 4
( 171 )
9
( 229 )
15
( 381 )
6-3 / 4
( 171 )
9
( 229 )
15
( 381 )
6-3 / 4
( 171 )
9
( 229 )
15
( 381 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.24
0.18
0.10
n / a
n / a
n / a
0.05
0.04
0.02
0.09
0.07
0.04
n / a
n / a
n / a
3-3 / 4
( 95 )
0.59
0.57
0.54
0.33
0.24
0.14
0.55
0.54
0.53
0.15
0.11
0.07
0.30
0.22
0.13
n / a
n / a
n / a
4
( 102 )
0.60
0.57
0.54
0.34
0.25
0.15
0.55
0.54
0.53
0.16
0.12
0.07
0.33
0.24
0.15
n / a
n / a
n / a
5
( 127 )
0.62
0.59
0.56
0.39
0.28
0.17
0.56
0.55
0.54
0.23
0.17
0.10
0.39
0.28
0.17
n / a
n / a
n / a
6
( 152 )
0.65
0.61
0.57
0.44
0.32
0.19
0.57
0.56
0.54
0.30
0.22
0.13
0.44
0.32
0.19
n / a
n / a
n / a
7
( 178 )
0.67
0.63
0.58
0.49
0.36
0.21
0.59
0.57
0.55
0.38
0.28
0.17
0.49
0.36
0.21
n / a
n / a
n / a
8
( 203 )
0.70
0.65
0.59
0.55
0.41
0.24
0.60
0.58
0.56
0.46
0.34
0.21
0.55
0.41
0.24
n / a
n / a
n / a
8-1 / 2
( 216 )
0.71
0.66
0.59
0.59
0.43
0.25
0.61
0.59
0.56
0.50
0.38
0.23
0.59
0.43
0.25
0.65
n / a
n / a
9
( 229 )
0.72
0.67
0.60
0.62
0.46
0.27
0.61
0.59
0.57
0.55
0.41
0.25
0.62
0.46
0.27
0.67
n / a
n / a
10
( 254 )
0.75
0.69
0.61
0.69
0.51
0.30
0.62
0.60
0.57
0.64
0.48
0.29
0.69
0.51
0.30
0.70
n / a
n / a
10-3 / 4
( 273 )
0.77
0.70
0.62
0.74
0.55
0.32
0.63
0.61
0.58
0.72
0.54
0.32
0.74
0.55
0.32
0.73
0.66
n / a
12
( 305 )
0.80
0.72
0.63
0.83
0.61
0.36
0.65
0.62
0.59
0.84
0.63
0.38
0.83
0.61
0.36
0.77
0.70
n / a
14
( 356 )
0.85
0.76
0.66
0.97
0.71
0.42
0.67
0.64
0.60
1.00
0.80
0.48
0.97
0.71
0.42
0.83
0.76
n / a
16
( 406 )
0.90
0.80
0.68
1.00
0.81
0.48
0.70
0.66
0.62
0.98
0.59
1.00
0.81
0.48
0.89
0.81
n / a
16-3 / 4
( 425 )
0.91
0.81
0.69
0.85
0.50
0.71
0.67
0.62
1.00
0.63
0.85
0.50
0.91
0.83
0.70
18
( 457 )
0.94
0.83
0.70
0.91
0.54
0.72
0.68
0.63
0.70
0.91
0.54
0.95
0.86
0.72
20
( 508 )
0.99
0.87
0.72
1.00
0.60
0.75
0.70
0.65
0.82
1.00
0.60
1.00
0.91
0.76
22
( 559 )
1.00
0.91
0.74
0.65
0.77
0.73
0.66
0.94
0.65
0.95
0.80
24
( 610 )
0.94
0.77
0.71
0.80
0.75
0.67
1.00
0.71
0.99
0.84
26
( 660 )
0.98
0.79
0.77
0.82
0.77
0.69
0.77
1.00
0.87
28
( 711 )
1.00
0.81
0.83
0.85
0.79
0.70
0.83
0.90
30
( 762 )
0.83
0.89
0.87
0.81
0.72
0.89
0.94
36
( 914 )
0.90
1.00
0.95
0.87
0.76
1.00
1.00
> 48
( 1219 )
1.00
1.00
0.99
0.85
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 the installation torque is reduced to 0.30 T max for 5d ≤ s ≤ 16-in . and to 0.5 T max for s > 16-in . 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
212 Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.5 HIT-ICE ADHESIVE ANCHORING SYSTEM 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