1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
4. Design
Introduction
5. Base material
6. Loading
Shear Load Acting Perpendicular to Channel
8. Reinforcing
Bar Anchorage
Steel
10. Design
Software
Channel Lip Strength ϕV sl,y
Concrete
Table 7.4.1.1 — Test program for anchor channels for use in uncracked and cracked concrete (Table 4.1 of AC232).
Minimum
No. of
tests Channel Anchor Material
[-] Secion
in Annex
A [-] psi
[N/mm 2 ] inch
(mm) [-] [-] [-] [-]
8 7.8
Channel bolt
d s strength
inch
(mm) [-]
V ns : Nominal steel strength of anchor channel loaded in shear
(lowest value of V sa , V sc , and V Sl )
V ss, M =
a . M
M
ss
l
, lb(N)
ESR-3520 Equation (28)
α M = f actor to take into account the restraint condition of the
fixture
= 1.0 if the fixture can rotate freely (no restraint)
= 2.0 if the fixture cannot rotate (full restraint)
æ
N ua ö
M ss = M 0 ss ç ç 1 -
÷ , lb - in (N - mm) ESR-3520 Equation (29)
f
N ss ÷ ø
è
f utb =minimum [(1.9 fyb and 125,000 psi (860 MPa)], psi (MPa)).
M 0ss = n
ominal flexural strength of channel bolt according to
Table 8-12.
= 1.2(S chb )f utb , lbf-in (N-mm)
≤ 0.5N sl. a
≤ 0.5N ss. a
ℓ = lever arm, in. (mm)
a = internal lever arm, in. (mm) as illustrated in Figure 7.4.1.2
T s = tension force acting on channel lips
C s = compression force acting on channel lips
Steel failure under Shear load
9
Failure of anchor, failure of connection
between anchor and channel, local
rupture of channel lips 6
Low
0
5 1,8
See AC 232 section 7.8.2
intentionally left blank
Concrete failure under shear load
10
Concrete edge failure 7 factor α ch,V
c a = c a,min , s = s max ,
and h > h cr,V
Low
0
5
See AC 232 section 7.10.2
intentionally left blank
1 If the coefficient of variation Vof the failure loads is V ≤ 5 percent, the number of tests can be reduced to n = 3.
6 Tests may be omitted if the nominal shear strength of the channel, V nsy , is taken as < N ns .
7 Tests may be omitted if the nominal strength, V ns,y , is computed in accordance with Eq. (D-24a, ACI 318-05,-08), (D-33a, ACI 318-11), (17.5.2.10.2, ACI 318-14) with αch,v= 5.6 lbf 1/2 /in 1/3
(α ch,v = 4.0 N 1/2 /mm 1/3 for SI) (Normal weight concrete)
8 Five tests need to be conducted with the channel bolt positioned over the anchor and an additional five tests with the channel bolt positioned midway between the two anchors, unless
footnote 1 applies.
176
Figure 7.4.1.2 - Definition of internal lever arm.
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
177
11
7.10
∆w
If the fixture is not clamped against the concrete but secured
to the channel bolt at a distance from the concrete surface (e.g.
by double nuts), the nominal strength of a channel bolt in shear,
V ss,M , shall be computed in accordance with Eq. (28).
Tests 8 can be omitted if the nominal shear strength of the
channel, V ns,y , is taken as ≤ N ns . V ns is the nominal steel strength
of anchor channel loaded in shear (lowest value of V sa , V sc ,
and V sl . N ns is the nominal steel strength of the anchor channel
loaded in tension (lowest value of N sa , N sc and N sl ).
Figure 7.3.1.1— Possible tensile failure modes of an anchor channel.
f c
ϕV sc,y ≥ V auay
f utb shall be taken as the smaller of 1.9 f yb and 125,000 psi (860
MPa)
ϕV sa,y ≥ V auay
where
Anchor strength is determined from
Test 8. The test is performed on anchor
channels cast into concrete.
The nominal strength of a channel
bolt in shear, V ss , must be taken
from Table 8-12. The maximum
value shall be computed in
accordance with Eq. 17.5.1.4.1a,
ACI 318-14).
V ss = 0.6.A se,V .f utb , lbf (N)
Figure 7.4.1.1 — Steel failure in shear of anchor channel lip.
ϕV ss ≥ V bua ϕV ss,M ≥ V bua
The nominal strength of one anchor, V sa,y ,
and anchor and channel connection V sc,y
to take up shear loads perpendicular
to the channel must be taken from
Table 8-5 for HAC and HAC-T with Hilti
channel bolts (HBC-B, HBC-C, HBC-T
and HBC-C-N).
Test description
Bolt Strength ϕV ss , ϕV ss,M
Anchor Strength ϕ V sa,y and Anchor and Channel
Connection Strength ϕV sc,y
14. Design
Example
ϕV sl,y ≥ V auay
13. Field Fixes
Local rupture of channel lips is
determined from Test 8. The test is
performed on anchor channels cast
into concrete.
Test Ref
12. Instructions
for Use
Steel failure Anchors loaded in shear exhibit steel failure when
the edge distance and the embedment depth are sufficiently
large, whereby conical spalling of the surface concrete
precedes steel failure Figure 7.4.1.1. For a given anchor, steel
failure represents a limit on the maximum shear capacity.
Anchors made of ductile steels can develop relatively large
displacements at failure.
Test no.
11. Best
Practices
The nominal strength of the
channel lips to take up shear loads
perpendicular to the channel
transmitted by a channel bolt, V sl,y ,
must be taken from Table 8-5 for
HAC and HAC-T with Hilti channel
bolts (HBC-B, HBC-C, HBC-T and
HBC-C-N).
Shear (ΦV n,y )
7.4.1 S
TEEL STRENGTHS IN PERPENDICULAR
SHEAR
9. Special Anchor
Channel Design
7.4 ANCHOR CHANNEL DESIGN IN SHEAR
7. Anchor Channel
Design Code