1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
6. Loading
ϕV sa,x ≥ V auax
8. Reinforcing
Bar Anchorage
9. Special Anchor
Channel Design
10. Design
Software
The ϕ value is 0.65 for in which periodical inspection is provided
for M12 to M20 t-bolts. The ϕ value is 0.75 for in which continuous inspection is
provided for M12 to M20 t-bolts. The coefficient αM depends on the degree of rotational fixity of
the anchor where it joins the baseplate.
[-] [-] [-] [-]
d s strength
inch
(mm) [-]
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)
f
N ss ÷ ø
è
ESR-3520 Equation (29)
ominal flexural strength of channel bolt according to
M 0ss = n
Table 8-12.
≤ 0.5N sl. a
≤ 0.5N ss. a
ℓ = lever arm, in. (mm)
α = internal lever arm, in. (mm) as illustrated in Figure 7.4.3.1
Steel failure under shear load acting in longitudinal chaennel axis
7.14 Failure of connection between channel
lips and channel bolt Low 0 5 see AC232 Section 7.14.2 1
16 7.16 Failure of connection between channel
lips and channel bolt — influence of
level of prestressing force Low 0 5 see AC232 Section 7.16.2 1
17 1.17 Failure of connection between channel
lips and channel bolt — influence of
channel below concrete surface Low 0 5 see AC232 Section 7.17.2 1
15 psi
[N/mm 2 ]
Material
Table 8-7 gives steel strength information for shear acting in
longitudinal direction of the channel axis for anchor channel
HAC and channel bolts HBC-B.
V ss, M =
[-] Anchor
Shear load with lever arm In stand-
off installations, t-bolt are clearly
subjected to cantilever bending.
Flexural failure of the steel rod
generally defines the capacity.
Secion
in Annex
A Channel
The nominal strength of a channel
bolt in shear, V ss , must be taken from
ESR-3520 Table 8-6 of this report.
[-]
∆w
ϕV ss,M,x ≥ V buax
f c
ϕV ss,x ≥ V buax
Test description
Channel Bolt in Shear, ϕV ss , ϕV ss,M
Test Ref
Channel bolt
14. Design
Example
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).
The ϕ value is 0.65 for which continuous inspection is provided
for M16 and M20 t-bolts. The steel strength for M12 t-bolts
used with continuous inspection an increased value of 2,021lbs
should be used with ϕ value of 0.55. Test No 15, 16 and 17 of
AC-232 table 4.2, is performed.
Table 7.4.3.1 — Test program for anchor channels for use in uncracked and cracked concete (Table 4.2 of AC232)
13. Field Fixes
Figure 7.4.3.1 — Possible tensile failure modes of an anchor channel.
Test no.
12. Instructions
for Use
The nominal strength of the
connection between channel lips and
channel bolt to take up shear loads
acting in longitudinal channel axis,
V sl,x , must be taken from ESR-3520
Table 8-7 , 8-8 or 8-9, as applicable.
Table 8-9 gives steel strength
information for shear acting in
longitudinal direction of the channel
axis for anchor channel HAC-T and channel bolts HBC-T. Please
note the following:
Table 8-8 gives steel strength information for shear acting in
longitudinal direction of the channel axis for anchor channel
HAC and channel bolts HBC-C-N. Please note the following:
The ϕ value is 0.55 for which periodical inspection is provided
for all t-bolts.
Minimum
No. of
tests
11. Best
Practices
ϕ V sl,x ≥ V buax
ϕV sc,x ≥ V auax
The nominal strength of one anchor,
V sa,x , and anchor and channel
connection V sc,x to take up shear
loads acting in longitudinal channel
axis must be taken from Table 8-5
for HAC and HAC-T with Hilti channel
bolts (HBC-C, HBC-T and HBC-C-N).
Concrete
7. Anchor Channel
Design Code
Channel Lip Strength ϕV sl,x
Anchor Strength ϕV sa,x and Anchor and Channel
Connection Strength ϕV sc,x
Shear (ΦV n,x )
Steel
5. Base material
7.4.3 S
TEEL STRENGTHS IN LONGITUDINAL
SHEAR
4. Design
Introduction
Figure 7.4.3.1 — Definition of lever arm.
Figure 7.4.3.2— Channel bolt resisting shear forces with stand off.
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
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