Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 430

Anchor spacing and edge distance guidelines
Anchor spacing adjustment factors s = Actual Spacing
s min
= 2.0 h nom
Edge distance adjustment factors c = Actual edge distance
c min
= 2.0 h nom s cr
= 3.5 h nom c cr
= 3.0 h nom
Influence of anchor spacing and edge distance ƒ A and ƒ R
Anchor Size h nom
Anchor spacing adjustment Factor Edge distance adjustment factor
in .
( mm )
in .
( mm )
1 / 4
( 6.4 )
1
( 25 )
3 / 8
( 9.5 )
1-9 / 16
( 40 )
1 / 2
( 12.7 )
2
( 51 )
5 / 8
( 15.8 )
2-9 / 16
( 65 )
3 / 4
( 19.1 )
3-3 / 16
( 81 )
h nom
= nominal embedment depth
Table 7 — Load adjustment factors for Hilti HDI drop-in anchors in concrete Load adjustment factors for anchor spacing ƒ A
Load adjustment factors for edge distance ƒ R Tension / shear loads Tension ƒ RN
Shear ƒ RV Spacing s Anchor diameter Edge distance c Anchor diameter Anchor diameter in . ( mm ) 1 / 4 3 / 8 1 / 2 5 / 8 3 / 4 in . ( mm ) 1 / 4 3 / 8 1 / 2 5 / 8 3 / 4 1 / 4 3 / 8 1 / 2 5 / 8 3 / 4
2
( 51 )
. 50
2
( 51 )
. 80
. 65
2-1 / 2
( 64 )
. 67
2-1 / 2
( 64 )
. 90
. 83
3
( 76 )
. 83
. 50
3
( 76 )
1.0
. 80
1.0
. 65
3-1 / 2
( 89 )
1.0
. 58
3-1 / 2
( 89 )
. 85
. 73
4
( 102 )
. 69
. 50
4
( 102 )
. 91
. 80
. 85
. 65
4-1 / 2
( 114 )
. 79
. 58
4-1 / 2
( 114 )
. 98
. 85
. 96
. 74
5
( 127 )
. 90
. 67
. 50
5
( 127 )
1.0
. 90
. 80
1.0
. 83
. 65
5-1 / 2
( 140 )
1.0
. 75
. 55
5-1 / 2
( 140 )
. 95
. 83
. 91
. 70
6
( 152 )
. 83
. 61
. 50
6
( 152 )
1.0
. 87
1.0
. 77
7
( 178 )
1.0
. 74
. 57
6-1 / 2
( 165 )
. 91
. 80
. 84
. 65
8
( 203 )
. 87
. 67
7
( 178 )
. 95
. 84
. 91
. 72
9
( 229 )
1.0
. 77
8
( 203 )
1.0
. 90
1.0
. 83
10
( 254 )
. 88
9
( 229 )
. 96
. 94
11
( 279 )
. 98
10
( 254 )
1.0
1.0
12
( 305 )
1.0
s min
= 2.0 h nom
s cr
= 3.5 h nom
c min
=2.0 h nom c cr
= 3.0 h nom
c min
= 2.0 h nom
c cr
= 3.0 h nom
ƒ A
= 0.33
s
h nom
– 0.17
ƒ RN
= 0.2 c + 0.4 h nom
ƒ RV
= 0.35 c – 0.05 h nom
for s cr > s > s min for c cr > c > c min for c cr
> c > c min
426 Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.12 HDI +, HDI-L +, AND HDI DROP IN ANCHORS 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