Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 217

Anchor Fastening Technical Guide , Edition 22
Table 27 — Load adjustment factors for # 7 rebar in uncracked concrete 1 , 2 , 3
Edge distance in shear
# 7 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 edge
ƒ RV
Concrete thickness factor in shear 5
Embedment h ef
in .
( mm )
7-7 / 8
( 200 )
10-1 / 2
( 267 )
17-1 / 2
( 445 )
7-7 / 8
( 200 )
10-1 / 2
( 267 )
17-1 / 2
( 445 )
7-7 / 8
( 200 )
10-1 / 2
( 267 )
17-1 / 2
( 445 )
7-7 / 8
( 200 )
10-1 / 2
( 267 )
17-1 / 2
( 445 )
7-7 / 8
( 200 )
10-1 / 2
( 267 )
17-1 / 2
( 445 )
7-7 / 8
( 200 )
10-1 / 2
( 267 )
17-1 / 2
( 445 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.23
0.17
0.10
n / a
n / a
n / a
0.03
0.03
0.02
0.07
0.05
0.03
n / a
n / a
n / a
4-3 / 8
( 111 )
0.59
0.57
0.54
0.33
0.24
0.14
0.54
0.54
0.53
0.14
0.10
0.06
0.28
0.21
0.12
n / a
n / a
n / a
5
( 127 )
0.61
0.58
0.55
0.35
0.26
0.15
0.55
0.54
0.53
0.17
0.13
0.08
0.34
0.25
0.15
n / a
n / a
n / a
6
( 152 )
0.63
0.60
0.56
0.39
0.29
0.17
0.56
0.55
0.54
0.22
0.17
0.10
0.39
0.29
0.17
n / a
n / a
n / a
7
( 178 )
0.65
0.61
0.57
0.44
0.32
0.19
0.57
0.56
0.54
0.28
0.21
0.13
0.44
0.32
0.19
n / a
n / a
n / a
8
( 203 )
0.67
0.63
0.58
0.48
0.35
0.21
0.58
0.57
0.55
0.34
0.26
0.15
0.48
0.35
0.21
n / a
n / a
n / a
9
( 229 )
0.69
0.64
0.59
0.53
0.39
0.23
0.59
0.58
0.55
0.41
0.31
0.18
0.53
0.39
0.23
n / a
n / a
n / a
9-7 / 8
( 251 )
0.71
0.66
0.59
0.59
0.43
0.25
0.60
0.58
0.56
0.47
0.35
0.21
0.59
0.43
0.25
0.63
n / a
n / a
10
( 254 )
0.71
0.66
0.60
0.59
0.44
0.26
0.60
0.58
0.56
0.48
0.36
0.21
0.59
0.44
0.26
0.64
n / a
n / a
11
( 279 )
0.73
0.67
0.60
0.65
0.48
0.28
0.61
0.59
0.57
0.55
0.41
0.25
0.65
0.48
0.28
0.67
n / a
n / a
12
( 305 )
0.75
0.69
0.61
0.71
0.52
0.31
0.62
0.60
0.57
0.63
0.47
0.28
0.71
0.52
0.31
0.70
n / a
n / a
12-1 / 2
( 318 )
0.76
0.70
0.62
0.74
0.55
0.32
0.63
0.60
0.57
0.67
0.50
0.30
0.74
0.55
0.32
0.71
0.65
n / a
14
( 356 )
0.80
0.72
0.63
0.83
0.61
0.36
0.64
0.62
0.58
0.79
0.59
0.36
0.83
0.61
0.36
0.75
0.69
n / a
16
( 406 )
0.84
0.75
0.65
0.95
0.70
0.41
0.66
0.63
0.60
0.97
0.72
0.43
0.95
0.70
0.41
0.81
0.73
n / a
18
( 457 )
0.88
0.79
0.67
1.00
0.79
0.46
0.68
0.65
0.61
1.00
0.86
0.52
1.00
0.79
0.46
0.86
0.78
n / a
19-1 / 2
( 495 )
0.91
0.81
0.69
0.85
0.50
0.70
0.66
0.62
0.97
0.58
0.85
0.50
0.89
0.81
0.68
20
( 508 )
0.92
0.82
0.69
0.87
0.51
0.70
0.67
0.62
1.00
0.61
0.87
0.51
0.90
0.82
0.69
22
( 559 )
0.97
0.85
0.71
0.96
0.56
0.72
0.68
0.63
0.70
0.96
0.56
0.95
0.86
0.73
24
( 610 )
1.00
0.88
0.73
1.00
0.61
0.74
0.70
0.64
0.80
1.00
0.61
0.99
0.90
0.76
26
( 660 )
0.91
0.75
0.67
0.76
0.72
0.66
0.90
0.67
1.00
0.93
0.79
28
( 711 )
0.94
0.77
0.72
0.78
0.74
0.67
1.00
0.72
0.97
0.82
30
( 762 )
0.98
0.79
0.77
0.81
0.75
0.68
0.77
1.00
0.85
36
( 914 )
1.00
0.84
0.92
0.87
0.80
0.72
0.92
0.93
> 48
( 1219 )
0.96
1.00
0.99
0.90
0.79
1.00
1.00
Spacing ( s ) / Edge distance ( c a ) / Concrete thickness ( h ), - in . ( mm ) ƒ HV
3.2.5
Table 28 — Load adjustment factors for # 8 rebar in uncracked concrete 1 , 2 , 3
# 8 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 )
9
( 229 )
12
( 305 )
20
( 508 )
9
( 229 )
12
( 305 )
20
( 508 )
9
( 229 )
12
( 305 )
20
( 508 )
9
( 229 )
12
( 305 )
20
( 508 )
9
( 229 )
12
( 305 )
20
( 508 )
9
( 229 )
12
( 305 )
20
( 508 )
1-3 / 4
( 44 )
n / a
n / a
n / a
0.23
0.17
0.10
n / a
n / a
n / a
0.03
0.02
0.01
0.05
0.04
0.02
n / a
n / a
n / a
5
( 127 )
0.59
0.57
0.54
0.33
0.24
0.14
0.54
0.54
0.53
0.13
0.10
0.06
0.26
0.20
0.12
n / a
n / a
n / a
6
( 152 )
0.61
0.58
0.55
0.36
0.27
0.16
0.55
0.54
0.53
0.17
0.13
0.08
0.34
0.26
0.16
n / a
n / a
n / a
7
( 178 )
0.63
0.60
0.56
0.40
0.29
0.17
0.56
0.55
0.54
0.22
0.16
0.10
0.40
0.29
0.17
n / a
n / a
n / a
8
( 203 )
0.65
0.61
0.57
0.44
0.32
0.19
0.57
0.56
0.54
0.27
0.20
0.12
0.44
0.32
0.19
n / a
n / a
n / a
9
( 229 )
0.67
0.63
0.58
0.48
0.35
0.21
0.58
0.56
0.55
0.32
0.24
0.14
0.48
0.35
0.21
n / a
n / a
n / a
10
( 254 )
0.69
0.64
0.58
0.52
0.38
0.23
0.59
0.57
0.55
0.37
0.28
0.17
0.52
0.38
0.23
n / a
n / a
n / a
11
( 279 )
0.70
0.65
0.59
0.57
0.42
0.25
0.59
0.58
0.56
0.43
0.32
0.19
0.57
0.42
0.25
n / a
n / a
n / a
11-1 / 4
( 286 )
0.71
0.66
0.59
0.59
0.43
0.25
0.60
0.58
0.56
0.44
0.33
0.20
0.59
0.43
0.25
0.62
n / a
n / a
12
( 305 )
0.72
0.67
0.60
0.63
0.46
0.27
0.60
0.59
0.56
0.49
0.37
0.22
0.63
0.46
0.27
0.64
n / a
n / a
13
( 330 )
0.74
0.68
0.61
0.68
0.50
0.29
0.61
0.59
0.57
0.55
0.41
0.25
0.68
0.50
0.29
0.67
n / a
n / a
14
( 356 )
0.76
0.69
0.62
0.73
0.54
0.32
0.62
0.60
0.57
0.61
0.46
0.28
0.73
0.54
0.32
0.69
n / a
n / a
14-1 / 4
( 362 )
0.76
0.70
0.62
0.74
0.55
0.32
0.62
0.60
0.57
0.63
0.47
0.28
0.74
0.55
0.32
0.70
0.64
n / a
16
( 406 )
0.80
0.72
0.63
0.84
0.61
0.36
0.64
0.61
0.58
0.75
0.56
0.34
0.84
0.61
0.36
0.74
0.67
n / a
18
( 457 )
0.83
0.75
0.65
0.94
0.69
0.41
0.65
0.63
0.59
0.90
0.67
0.40
0.94
0.69
0.41
0.79
0.72
n / a
20
( 508 )
0.87
0.78
0.67
1.00
0.77
0.45
0.67
0.64
0.60
1.00
0.79
0.47
1.00
0.77
0.45
0.83
0.75
n / a
22
( 559 )
0.91
0.81
0.68
0.85
0.50
0.69
0.66
0.61
0.91
0.54
0.85
0.50
0.87
0.79
n / a
22-1 / 4
( 565 )
0.91
0.81
0.69
0.85
0.50
0.69
0.66
0.61
0.92
0.55
0.85
0.50
0.88
0.80
0.67
24
( 610 )
0.94
0.83
0.70
0.92
0.54
0.71
0.67
0.62
1.00
0.62
0.92
0.54
0.91
0.83
0.70
26
( 660 )
0.98
0.86
0.72
1.00
0.59
0.72
0.68
0.63
0.70
1.00
0.59
0.95
0.86
0.72
28
( 711 )
1.00
0.89
0.73
0.63
0.74
0.70
0.64
0.78
0.63
0.98
0.89
0.75
30
( 762 )
0.92
0.75
0.68
0.76
0.71
0.65
0.87
0.68
1.00
0.92
0.78
36
( 914 )
1.00
0.80
0.81
0.81
0.76
0.68
1.00
0.81
1.00
0.85
> 48
( 1219 )
0.90
1.00
0.91
0.84
0.74
1.00
0.98
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
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
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