Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 124

Table 20 — Load adjustment factors for # 9 rebar in uncracked concrete 1 , 2 , 3
# 9 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
ƒ HV
Embedment
in .
10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2
h ef
( mm )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
Spacing ( s ) / edge eistance ( c a ) / concrete thickness ( h ), - in . ( mm )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.24
0.17
0.10
n / a
n / a
n / a
0.02
0.01
0.01
0.04
0.02
0.01
n / a
n / a
n / a
5-5 / 8
( 143 )
0.59
0.57
0.54
0.33
0.23
0.13
0.54
0.53
0.52
0.11
0.07
0.03
0.22
0.14
0.07
n / a
n / a
n / a
6
( 152 )
0.60
0.57
0.54
0.33
0.23
0.13
0.54
0.53
0.52
0.12
0.08
0.04
0.24
0.16
0.07
n / a
n / a
n / a
7
( 178 )
0.61
0.59
0.55
0.36
0.25
0.14
0.55
0.54
0.52
0.15
0.10
0.05
0.30
0.20
0.09
n / a
n / a
n / a
8
( 203 )
0.63
0.60
0.56
0.38
0.27
0.15
0.55
0.54
0.52
0.18
0.12
0.06
0.37
0.24
0.11
n / a
n / a
n / a
9
( 229 )
0.65
0.61
0.57
0.41
0.28
0.16
0.56
0.55
0.53
0.22
0.14
0.07
0.41
0.28
0.13
n / a
n / a
n / a
10
( 254 )
0.66
0.62
0.57
0.44
0.30
0.17
0.57
0.55
0.53
0.26
0.17
0.08
0.44
0.30
0.16
n / a
n / a
n / a
11
( 279 )
0.68
0.64
0.58
0.46
0.32
0.18
0.57
0.56
0.53
0.30
0.19
0.09
0.46
0.32
0.18
n / a
n / a
n / a
12
( 305 )
0.70
0.65
0.59
0.49
0.34
0.20
0.58
0.56
0.54
0.34
0.22
0.10
0.49
0.34
0.20
n / a
n / a
n / a
12-7 / 8
( 327 )
0.71
0.66
0.60
0.52
0.36
0.21
0.59
0.57
0.54
0.38
0.24
0.11
0.52
0.36
0.21
0.59
n / a
n / a
13
( 330 )
0.71
0.66
0.60
0.52
0.36
0.21
0.59
0.57
0.54
0.38
0.25
0.12
0.52
0.36
0.21
0.59
n / a
n / a
14
( 356 )
0.73
0.67
0.60
0.55
0.38
0.22
0.59
0.57
0.54
0.43
0.28
0.13
0.55
0.38
0.22
0.61
n / a
n / a
16
( 406 )
0.76
0.70
0.62
0.62
0.43
0.25
0.61
0.58
0.55
0.52
0.34
0.16
0.62
0.43
0.25
0.66
n / a
n / a
16-1 / 4
( 413 )
0.77
0.70
0.62
0.63
0.43
0.25
0.61
0.58
0.55
0.53
0.35
0.16
0.63
0.43
0.25
0.66
0.57
n / a
18
( 457 )
0.80
0.72
0.63
0.69
0.48
0.28
0.62
0.59
0.55
0.62
0.40
0.19
0.69
0.48
0.28
0.70
0.60
n / a
20
( 508 )
0.83
0.75
0.65
0.77
0.54
0.31
0.63
0.60
0.56
0.73
0.47
0.22
0.77
0.54
0.31
0.73
0.64
n / a
22
( 559 )
0.86
0.77
0.66
0.85
0.59
0.34
0.65
0.61
0.57
0.84
0.55
0.25
0.85
0.59
0.34
0.77
0.67
n / a
24
( 610 )
0.89
0.80
0.68
0.93
0.64
0.37
0.66
0.62
0.57
0.96
0.62
0.29
0.93
0.64
0.37
0.80
0.70
n / a
25-1 / 4
( 641 )
0.91
0.81
0.69
0.97
0.68
0.39
0.67
0.63
0.58
1.00
0.67
0.31
0.97
0.68
0.39
0.83
0.71
0.55
26
( 660 )
0.93
0.82
0.69
1.00
0.70
0.40
0.68
0.63
0.58
0.70
0.33
1.00
0.70
0.40
0.84
0.73
0.56
28
( 711 )
0.96
0.85
0.71
0.75
0.43
0.69
0.64
0.59
0.78
0.36
0.75
0.43
0.87
0.75
0.58
30
( 762 )
0.99
0.87
0.72
0.80
0.46
0.70
0.65
0.59
0.87
0.40
0.80
0.46
0.90
0.78
0.60
36
( 914 )
1.00
0.94
0.77
0.96
0.55
0.74
0.68
0.61
1.00
0.53
0.96
0.55
0.99
0.85
0.66
> 48
( 1219 )
1.00
0.86
1.00
0.74
0.82
0.74
0.65
0.82
1.00
0.74
1.00
0.99
0.76
Table 21 — Load adjustment factors for # 9 rebar in cracked concrete 1 , 2 , 3
# 9 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
ƒ HV
Embedment
in .
10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2 10-1 / 8 13-1 / 2 22-1 / 2
h ef
( mm )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
( 257 )
( 343 )
( 572 )
Spacing ( s ) / edge eistance ( c a ) / concrete thickness ( h ), - in . ( mm )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.41
0.39
0.38
n / a
n / a
n / a
0.02
0.01
0.01
0.04
0.02
0.01
n / a
n / a
n / a
5-5 / 8
( 143 )
0.59
0.57
0.54
0.56
0.50
0.44
0.54
0.53
0.52
0.11
0.07
0.03
0.22
0.14
0.07
n / a
n / a
n / a
6
( 152 )
0.60
0.57
0.54
0.57
0.51
0.44
0.54
0.53
0.52
0.12
0.08
0.04
0.24
0.16
0.07
n / a
n / a
n / a
7
( 178 )
0.61
0.59
0.55
0.61
0.54
0.46
0.55
0.54
0.52
0.15
0.10
0.05
0.30
0.20
0.09
n / a
n / a
n / a
8
( 203 )
0.63
0.60
0.56
0.65
0.57
0.48
0.55
0.54
0.52
0.19
0.12
0.06
0.37
0.24
0.11
n / a
n / a
n / a
9
( 229 )
0.65
0.61
0.57
0.70
0.60
0.49
0.56
0.55
0.53
0.22
0.14
0.07
0.44
0.29
0.13
n / a
n / a
n / a
10
( 254 )
0.66
0.62
0.57
0.74
0.63
0.51
0.57
0.55
0.53
0.26
0.17
0.08
0.52
0.34
0.16
n / a
n / a
n / a
11
( 279 )
0.68
0.64
0.58
0.79
0.67
0.53
0.57
0.56
0.53
0.30
0.19
0.09
0.60
0.39
0.18
n / a
n / a
n / a
12
( 305 )
0.70
0.65
0.59
0.84
0.70
0.55
0.58
0.56
0.54
0.34
0.22
0.10
0.68
0.44
0.21
n / a
n / a
n / a
12-7 / 8
( 327 )
0.71
0.66
0.60
0.88
0.73
0.56
0.59
0.57
0.54
0.38
0.25
0.11
0.76
0.49
0.23
0.59
n / a
n / a
13
( 330 )
0.71
0.66
0.60
0.89
0.73
0.56
0.59
0.57
0.54
0.39
0.25
0.12
0.77
0.50
0.23
0.59
n / a
n / a
14
( 356 )
0.73
0.67
0.60
0.94
0.77
0.58
0.60
0.57
0.54
0.43
0.28
0.13
0.86
0.56
0.26
0.62
n / a
n / a
16
( 406 )
0.76
0.70
0.62
1.00
0.84
0.62
0.61
0.58
0.55
0.53
0.34
0.16
1.00
0.68
0.32
0.66
n / a
n / a
16-1 / 4
( 413 )
0.77
0.70
0.62
1.00
0.85
0.63
0.61
0.58
0.55
0.54
0.35
0.16
1.00
0.70
0.32
0.66
0.58
n / a
18
( 457 )
0.80
0.72
0.63
1.00
0.91
0.66
0.62
0.59
0.55
0.63
0.41
0.19
1.00
0.82
0.38
0.70
0.61
n / a
20
( 508 )
0.83
0.75
0.65
1.00
0.99
0.70
0.64
0.60
0.56
0.73
0.48
0.22
1.00
0.95
0.44
0.74
0.64
n / a
22
( 559 )
0.86
0.77
0.66
1.00
1.00
0.74
0.65
0.61
0.57
0.85
0.55
0.26
1.00
1.00
0.51
0.77
0.67
n / a
24
( 610 )
0.89
0.80
0.68
1.00
1.00
0.78
0.66
0.62
0.57
0.97
0.63
0.29
1.00
1.00
0.58
0.81
0.70
n / a
25-1 / 4
( 641 )
0.91
0.81
0.69
1.00
1.00
0.81
0.67
0.63
0.58
1.00
0.68
0.31
1.00
1.00
0.63
0.83
0.72
0.56
26
( 660 )
0.93
0.82
0.69
1.00
1.00
0.82
0.68
0.63
0.58
1.00
0.71
0.33
1.00
1.00
0.66
0.84
0.73
0.56
28
( 711 )
0.96
0.85
0.71
1.00
1.00
0.87
0.69
0.64
0.59
1.00
0.79
0.37
1.00
1.00
0.73
0.87
0.76
0.58
30
( 762 )
0.99
0.87
0.72
1.00
1.00
0.91
0.70
0.65
0.59
1.00
0.88
0.41
1.00
1.00
0.82
0.90
0.78
0.61
36
( 914 )
1.00
0.94
0.77
1.00
1.00
1.00
0.74
0.68
0.61
1.00
1.00
0.54
1.00
1.00
1.00
0.99
0.86
0.66
> 48
( 1219 )
1.00
1.00
0.86
1.00
1.00
1.00
0.83
0.74
0.65
1.00
1.00
0.82
1.00
1.00
1.00
1.00
0.99
0.77
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 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 .
120
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.3 HIT-RE 500 V3 EPOXY 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