Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 307

Anchor Fastening Technical Guide , Edition 22
Table 6 — Load adjustment factors for Carbon Steel 1 / 4-in . diameter KB-TZ2 in uncracked concrete 1 , 2
1 / 4-in . KB-TZ2 uncracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 3
ƒ AV
┴ Toward edge
ƒ RV
‖ To edge
ƒ RV
Concrete thickness factor
4 in shear
ƒ HV
Effective Embedment
in .
1-1 / 2
1-1 / 2
1-1 / 2
1-1 / 2
1-1 / 2
1-1 / 2
h ef
( mm )
( 38 )
( 38 )
( 38 )
( 38 )
( 38 )
( 38 )
Nominal Embedment
in .
1-3 / 4
1-3 / 4
1-3 / 4
1-3 / 4
1-3 / 4
1-3 / 4
h nom
( mm )
( 44 )
( 44 )
( 44 )
( 44 )
( 44 )
( 44 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
1-1 / 2
( 38 )
0.67
0.42
0.56
0.23
0.42
n / a
2
( 51 )
0.72
0.51
0.58
0.35
0.51
n / a
2-1 / 2
( 64 )
0.78
0.63
0.60
0.49
0.63
n / a
3
( 76 )
0.83
0.75
0.63
0.65
0.75
n / a
3-1 / 4
( 83 )
0.86
0.81
0.64
0.73
0.81
0.74
3-1 / 2
( 89 )
0.89
0.88
0.65
0.82
0.88
0.76
4
( 102 )
0.94
1.00
0.67
1.00
1.00
0.82
5
( 127 )
1.00
0.71
0.91
6
( 152 )
0.75
1.00
7
( 178 )
0.79
8
( 203 )
0.83
9
( 229 )
0.88
> 12
( 305 )
1.00
Table 7 — Load adjustment factors for Carbon Steel 1 / 4-in . diameter KB-TZ2 in cracked concrete 1 , 2
3.3.5
1 / 4-in . KB-TZ2 cracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 3
ƒ AV
┴ Toward edge
ƒ RV
‖ To edge
ƒ RV
Concrete thickness factor
4 in shear
ƒ HV
Effective Embedment
in .
1-1 / 2
1-1 / 2
1-1 / 2
1-1 / 2
1-1 / 2
1-1 / 2
h e
( mm )
( 38 )
( 38 )
( 38 )
( 38 )
( 38 )
( 38 )
Nominal Embedment
in .
1-3 / 4
1-3 / 4
1-3 / 4
1-3 / 4
1-3 / 4
1-3 / 4
h nom
( mm )
( 44 )
( 44 )
( 44 )
( 44 )
( 44 )
( 44 )
Spacing ( s ) / Edge Distance ( c a
) / Concrete Thickness ( h ) - in . ( mm )
1-1 / 2
( 38 )
0.67
0.75
0.57
0.29
0.59
n / a
2
( 51 )
0.72
0.91
0.60
0.45
0.91
n / a
2-1 / 2
( 64 )
0.78
1.00
0.62
0.63
1.00
n / a
3
( 76 )
0.83
0.65
0.83
n / a
3-1 / 4
( 83 )
0.86
0.66
0.94
0.80
3-1 / 2
( 89 )
0.89
0.67
1.00
0.83
4
( 102 )
0.94
0.70
0.89
5
( 127 )
1.00
0.75
0.99
6
( 152 )
0.80
1.00
7
( 178 )
0.84
8
( 203 )
0.89
9
( 229 )
0.94
> 12
( 305 )
1.00
1 Linear interpolation not permitted 2 When combining multiple load adjustment factors ( e . g . for a 4 anchor pattern in a corner with thin concrete member ) the design can become very conservative .
To optimize the design , use Hilti PROFIS Engineering Design software or perform anchor calculation using design equations from ACI 318 Ch . 17 or CSA A23.3 Annex D . 3 Spacing factor reduction in shear , f AV
, is applicable when edge distance c < 3h ef . If c ≥ 3h ef then f AV = f AN
.
4 Concrete thickness reduction factor in shear , f HV , is applicable when edge distance c < 3h ef
. If c ≥ 3h ef then f HV
= 1.0 .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.5 KWIK BOLT TZ2 EXPANSION ANCHOR 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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