Anchor Fastening Technical Guide , Edition 22
Table 4 — Hilti KB1 design strength based on steel failure 1 , 2
Nominal anchor diameter in .
3 / 8
1 / 2
5 / 8
3 / 4
3 / 4x12
Tensile 3
ФN sa lb ( kN )
Shear 4
ФV sa lb ( kN )
Seismic Shear 5
ФV sa lb ( kN )
4,760 1,655 1,655 ( 21.2 ) ( 7.4 ) ( 7.4 ) 8,145 3,395 3,395 ( 36.2 ) ( 15.1 ) ( 15.1 ) 12,875 5,790 5,790 ( 57.3 ) ( 25.8 ) ( 25.8 ) 18,220 6,995 5,950 ( 81.0 ) ( 31.1 ) ( 26.5 ) 15,790 6,460 5,490 ( 70.2 ) ( 28.7 ) ( 24.4 )
1 See Section 3.1.8 to convert design strength value to ASD value . 2 Hilti KB1 anchors are to be considered ductile steel elements , with the exception of the 3 / 4x12 KB1 which is a brittle steel element . 3 Tensile фN sa
= ф A se , N f uta as noted in ACI 318 Ch . 17 . 4 Shear values determined by static shear tests with фV sa
< ф 0.60 A se , V f uta as noted in ACI 318 Ch . 17 .
5 Seismic shear values determined by seismic shear tests with фV sa ≤ ф 0.60 A se , V f uta as noted in ACI 318 Ch . 17 . See Section 3.1.8 for additional information on seismic applications .
Figure 2
Anchors not permitted in shaded area c min , 1 c min , 2
Case 2
Case 1
For a specific edge distance , the permitted spacing is calculated as follows :
( s min , 1
– s min , 2 ) s ≥ s min , 2
+ ___________ ( c – c min , 2 )
( c min , 1
– c min , 2 ) spacing s s design c min , 1 at s min , 1 c min , 2 at s min , 2 3.3.9 s min , 2 s min , 1
Concrete Edge c designedge distance c
Table 5 — Hilti KB1 installation parameters in concrete 1
Setting information Symbol Units
Nominal anchor diameter ( mm ) 3 / 8 1 / 2 5 / 8 3 / 4
Effective minimum embedment |
h ef
|
( mm ) |
( 38 ) |
( 51 ) |
( 51 ) |
( 83 ) |
( 70 ) |
( 102 ) |
( 83 ) |
( 121 ) |
|
|
in . |
1-1 / 2 |
2 |
2 |
3-1 / 4 |
2-3 / 4 |
4 |
3-1 / 4 |
4-3 / 4 |
Minimum concrete thickness |
h min
|
( mm ) |
( 83 ) |
( 102 ) |
( 102 ) |
( 152 ) |
( 127 ) |
( 152 ) |
( 140 ) |
( 203 ) |
|
|
in . |
3-3 / 8 |
4 |
4 |
6 |
5 |
6 |
5-1 / 2 |
8 |
Case 1
Case 2
c min , 1
|
( mm ) |
( 203 ) |
( 64 ) |
( 102 ) |
( 70 ) |
( 140 ) |
( 108 ) |
( 241 ) |
( 114 ) |
|
in . |
8 |
2-1 / 2 |
4 |
2-3 / 4 |
5-1 / 2 |
4-1 / 4 |
9-1 / 2 |
4-1 / 2 |
for s min , 1 ≥ in . 8 7 8-1 / 2 7 8 4-1 / 4 5 7 ( mm ) ( 203 ) ( 178 ) ( 216 ) ( 178 ) ( 203 ) ( 108 ) ( 127 ) ( 178 )
c min , 2
|
( mm ) |
( 203 ) |
( 152 ) |
( 178 ) |
( 102 ) |
( 203 ) |
( 108 ) |
( 241 ) |
( 165 ) |
|
in . |
8 |
6 |
7 |
4 |
8 |
4-1 / 4 |
9-1 / 2 |
6-1 / 2 |
for s min , 2 ≥ in . 8 3-1 / 2 5 4 5-1 / 2 4-1 / 4 5 4 ( mm ) ( 203 ) ( 89 ) ( 127 ) ( 102 ) ( 140 ) ( 108 ) ( 127 ) ( 102 )
1 Linear interpolation is permitted to establish an edge distance and spacing combination between Case 1 and Case 2 . Linear interpolation for a specific edge distance c , where c min1 < c < c min2 will determine the permissible spacings .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.9 KB1 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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