Product Technical Guides : CA-EN Anchor Fastening - Volume 2 Edition 21 | Page 56

Table 28 — 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 and away from 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
0.03
0.02
0.01
0.07
0.05
0.03
n / a
n / a
n / a
3-3 / 4
( 95 )
0.59
0.57
0.54
0.31
0.23
0.13
0.54
0.53
0.52
0.11
0.07
0.04
0.22
0.14
0.08
n / a
n / a
n / a
4
( 102 )
0.60
0.57
0.54
0.32
0.23
0.14
0.54
0.53
0.52
0.12
0.08
0.05
0.24
0.16
0.09
n / a
n / a
n / a
5
( 127 )
0.62
0.59
0.56
0.35
0.26
0.15
0.55
0.54
0.53
0.17
0.11
0.06
0.33
0.22
0.13
n / a
n / a
n / a
6
( 152 )
0.65
0.61
0.57
0.39
0.29
0.17
0.56
0.55
0.53
0.22
0.14
0.08
0.41
0.29
0.17
n / a
n / a
n / a
7
( 178 )
0.67
0.63
0.58
0.43
0.32
0.19
0.57
0.55
0.54
0.28
0.18
0.11
0.45
0.36
0.21
n / a
n / a
n / a
8
( 203 )
0.70
0.65
0.59
0.48
0.35
0.20
0.58
0.56
0.54
0.34
0.22
0.13
0.49
0.40
0.26
n / a
n / a
n / a
8-1 / 2
( 216 )
0.71
0.66
0.59
0.50
0.37
0.21
0.59
0.56
0.55
0.37
0.24
0.14
0.51
0.41
0.28
0.59
n / a
n / a
9
( 229 )
0.72
0.67
0.60
0.52
0.38
0.22
0.59
0.57
0.55
0.40
0.26
0.15
0.53
0.43
0.31
0.60
n / a
n / a
10
( 254 )
0.75
0.69
0.61
0.57
0.42
0.25
0.60
0.58
0.55
0.47
0.31
0.18
0.57
0.46
0.33
0.64
n / a
n / a
10-3 / 4
( 273 )
0.77
0.70
0.62
0.62
0.45
0.27
0.61
0.58
0.56
0.53
0.34
0.20
0.62
0.48
0.35
0.66
0.57
n / a
12
( 305 )
0.80
0.72
0.63
0.69
0.51
0.30
0.62
0.59
0.56
0.62
0.40
0.24
0.69
0.52
0.37
0.70
0.60
n / a
14
( 356 )
0.85
0.76
0.66
0.80
0.59
0.35
0.64
0.61
0.57
0.78
0.51
0.30
0.80
0.59
0.40
0.75
0.65
n / a
16
( 406 )
0.90
0.80
0.68
0.92
0.67
0.39
0.66
0.62
0.59
0.96
0.62
0.37
0.92
0.67
0.43
0.80
0.70
n / a
16-3 / 4
( 425 )
0.91
0.81
0.69
0.96
0.71
0.41
0.67
0.63
0.59
1.00
0.67
0.39
0.96
0.71
0.45
0.82
0.71
0.60
18
( 457 )
0.94
0.83
0.70
1.00
0.76
0.44
0.68
0.64
0.60
0.74
0.44
1.00
0.76
0.47
0.85
0.74
0.62
20
( 508 )
0.99
0.87
0.72
0.84
0.49
0.70
0.65
0.61
0.87
0.51
0.84
0.51
0.90
0.78
0.65
22
( 559 )
1.00
0.91
0.74
0.93
0.54
0.72
0.67
0.62
1.00
0.59
0.93
0.55
0.94
0.82
0.68
24
( 610 )
0.94
0.77
1.00
0.59
0.74
0.68
0.63
0.67
1.00
0.59
0.99
0.85
0.72
26
( 660 )
0.98
0.79
0.64
0.76
0.70
0.64
0.76
0.64
1.00
0.89
0.74
28
( 711 )
1.00
0.81
0.69
0.78
0.71
0.65
0.85
0.69
0.92
0.77
30
( 762 )
0.83
0.74
0.80
0.73
0.66
0.94
0.74
0.95
0.80
36
( 914 )
0.90
0.89
0.86
0.77
0.69
1.00
0.89
1.00
0.88
> 48
( 1219 )
1.00
1.00
0.99
0.86
0.76
1.00
1.00
Spacing ( s ) / Edge distance ( c a ) / Concrete thickness ( h ), - in . ( mm ) ƒ HV
Table 29 — Load adjustment factors for # 6 rebar in cracked concrete 1 , 2 , 3
# 6 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 )
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
0.44
0.42
0.39
n / a
n / a
n / a
0.03
0.02
0.01
0.07
0.05
0.03
n / a
n / a
n / a
3-3 / 4
( 95 )
0.59
0.57
0.54
0.56
0.50
0.44
0.54
0.53
0.52
0.11
0.07
0.04
0.22
0.14
0.08
n / a
n / a
n / a
4
( 102 )
0.60
0.57
0.54
0.57
0.51
0.44
0.54
0.53
0.52
0.12
0.08
0.05
0.24
0.16
0.09
n / a
n / a
n / a
5
( 127 )
0.62
0.59
0.56
0.63
0.56
0.47
0.55
0.54
0.53
0.17
0.11
0.07
0.34
0.22
0.13
n / a
n / a
n / a
6
( 152 )
0.65
0.61
0.57
0.70
0.60
0.49
0.56
0.55
0.53
0.22
0.14
0.09
0.44
0.29
0.17
n / a
n / a
n / a
7
( 178 )
0.67
0.63
0.58
0.77
0.65
0.52
0.57
0.55
0.54
0.28
0.18
0.11
0.56
0.36
0.22
n / a
n / a
n / a
8
( 203 )
0.70
0.65
0.59
0.84
0.70
0.55
0.58
0.56
0.54
0.34
0.22
0.13
0.68
0.44
0.26
n / a
n / a
n / a
8-1 / 2
( 216 )
0.71
0.66
0.59
0.88
0.72
0.56
0.59
0.56
0.55
0.37
0.24
0.14
0.75
0.49
0.29
0.59
n / a
n / a
9
( 229 )
0.72
0.67
0.60
0.91
0.75
0.57
0.59
0.57
0.55
0.41
0.26
0.16
0.82
0.53
0.32
0.61
n / a
n / a
10
( 254 )
0.75
0.69
0.61
0.99
0.80
0.60
0.60
0.58
0.55
0.48
0.31
0.18
0.95
0.62
0.37
0.64
n / a
n / a
10-3 / 4
( 273 )
0.77
0.70
0.62
1.00
0.84
0.62
0.61
0.58
0.56
0.53
0.35
0.21
1.00
0.69
0.41
0.66
0.57
n / a
12
( 305 )
0.80
0.72
0.63
0.91
0.66
0.62
0.59
0.56
0.63
0.41
0.24
0.82
0.49
0.70
0.61
n / a
14
( 356 )
0.85
0.76
0.66
1.00
0.72
0.64
0.61
0.58
0.79
0.51
0.31
1.00
0.61
0.76
0.65
n / a
16
( 406 )
0.90
0.80
0.68
0.78
0.66
0.62
0.59
0.97
0.63
0.37
0.75
0.81
0.70
n / a
16-3 / 4
( 425 )
0.91
0.81
0.69
0.81
0.67
0.63
0.59
1.00
0.67
0.40
0.80
0.83
0.72
0.60
18
( 457 )
0.94
0.83
0.70
0.85
0.68
0.64
0.60
0.75
0.45
0.85
0.86
0.74
0.62
20
( 508 )
0.99
0.87
0.72
0.91
0.70
0.65
0.61
0.88
0.52
0.91
0.90
0.78
0.66
22
( 559 )
1.00
0.91
0.74
0.98
0.72
0.67
0.62
1.00
0.60
0.98
0.95
0.82
0.69
24
( 610 )
0.94
0.77
1.00
0.74
0.68
0.63
0.69
1.00
0.99
0.86
0.72
26
( 660 )
0.98
0.79
0.76
0.70
0.64
0.77
1.00
0.89
0.75
28
( 711 )
1.00
0.81
0.79
0.71
0.65
0.87
0.92
0.78
30
( 762 )
0.83
0.81
0.73
0.66
0.96
0.96
0.81
36
( 914 )
0.90
0.87
0.77
0.69
1.00
1.00
0.88
> 48
( 1219 )
1.00
0.99
0.87
0.76
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
52 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