Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 404

Table 10 — Hilti KWIK HUS screw anchor design information in accordance with CSA A23.3 Annex D 1
Design parameter
Symbol
Units
3 / 8
Nominal anchor diameter 1 / 2
5 / 8
3 / 4
Ref
A23.3
Anchor O . D .
d a
in .
( mm )
0.375
( 9.5 )
0.5
( 12.7 )
0.625
( 15.9 )
0.75
( 19.1 )
Effective minimum embedment 2
h ef
in .
( mm )
1.11
( 28 )
1.86
( 47 )
2.20
( 56 )
1.52
( 39 )
2.16
( 55 )
3.22
( 82 )
2.39
( 61 )
3.88
( 99 )
2.92
( 74 )
4.84
( 123 )
Minimum concrete thickness
h min
in .
( mm )
3-1 / 4
( 83 )
4
( 102 )
4-7 / 8
( 124 )
3-3 / 4
( 95 )
4-3 / 4
( 121 )
6-3 / 4
( 171 )
5
( 127 )
7
( 178 )
6
( 152 )
8-1 / 8
( 206 )
Critical edge distance
c ac
in .
( mm )
2.10
( 53 )
2.92
( 74 )
3.30
( 84 )
2.75
( 70 )
3.88
( 99 )
5.25
( 133 )
3.63
( 92 )
5.82
( 148 )
4.41
( 112 )
7.28
( 185 )
Minimum anchor spacing at critical edge distance s min , cac in . 2.25 3 4 ( mm ) ( 57 ) ( 76 ) ( 102 )
Minimum edge distance c min in . 1.50 1.75 ( mm ) ( 38 ) ( 44 )
Anchor spacing at minimum edge distance s min in . 3 4 ( mm ) ( 76 ) ( 102 )
Minimum hole depth in concrete
h o
in .
( mm )
1-7 / 8
( 48 )
2-3 / 4
( 70 )
3 1 / 2
( 86 )
2-5 / 8
( 67 )
3-3 / 8
( 86 )
4-5 / 8
( 117 )
3-5 / 8
( 92 )
5-3 / 8
( 137 )
4-3 / 8
( 111 )
6-5 / 8
( 168 )
Minimum specified ultimate strength
f uta
in .
( mm )
107,120
( 739 )
97,140
( 670 )
90,180
( 622 )
81,600
( 563 )
Effective tensile stress area
A se , N
in .
( mm )
0.086
( 55.5 )
0.161
( 103.9 )
0.268
( 172.9 )
0.392
( 252.9 )
Steel embedment material resistance
factor
ф s
-
0.85
8.4.3
for reinforcement
Resistance modification factor for tension ,
R
-
0.70
D . 5.3
steel failure modes 4
Resistance modification factor for shear , steel failure modes 4
R
-
0.65
D . 5.3
Factored steel resistance in tension
N sar
lb
( kN )
5,840
( 26.0 )
9,200
( 40.9 )
14,405
( 64.1 )
19,050
( 84.7 )
D . 6.1.2
Factored steel resistance in shear
V sar
lb
( kN )
2,850
( 12.7 )
4,525
( 20.1 )
6,200
( 27.6 )
9,205
( 40.9 )
D . 7.1.2
Coefficient for factored concrete breakout resistance , uncracked concrete k
c , uncr
-
10
11.2
D . 6.2.2
Modification factor for anchor resistance , tension , uncracked concrete 5
ψ c , N
-
10
D . 6.2.6
Anchor category
-
-
1
D . 5.3 ( c )
Concrete material resistance factor
ф c
-
0.65
8.4.2
Resistance modification factor for tension and shear , concrete failure modes , Condition B 6
R
-
1.00
D . 5.3 ( c )
Factored pullout resistance in 20 MPa lb
N uncracked concrete 7 pr , uncr
( kN )
NA D . 6.3.2
1 Design information in this table is taken from tables 2 of this section and converted with use of CSA A23.3 Annex D . 2 See figure 1 of this section . 3 For concrete over metal deck applications where the concrete thickness over the top flute is less than h min in this table , see figure 3 and table 3 of this section .
4 The KWIK HUS is considered a brittle steel element as defined by CSA A23.3 Annex D section D . 2 . 5 For all design cases , ψ c , N
= 1.0 .
6 For use with the load combinations of CSA A23.3 chapter 8 . Condition B applies where supplementary reinforcement in conformance with CSA A23.3 section D . 5.3 is not provided , or where pullout or pryout strength governs . For cases where the presence of supplementary reinforcement can be verified , the resistance modification factors associated with Condition A may be used .
7 For all design cases , ψ c , P
= 1.0 . NA ( not applicable ) denotes that this value does not control for design .
400 Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.10 KWIK HUS ( KH ) CARBON STEEL SCREW 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