1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
4. Design
Introduction
5. Base material
6. Loading
Anchor Strength, фN sa
ϕ N sa ≥ N aua
where A se,N is the effective cross-sectional area of an anchor in
tension, in. 2 , and f uta shall not be taken greater than the smaller
of 1.9f ya and 125,000 psi.
Anchor Strength of Connection Between Anchor and
Channel фN sc
ϕ N sc ≥ N aua
The connection between anchor and
channel strength N sc , and ϕ is tabulated
in Table ESR-3520 Table 8-3 for HAC
and HAC-T with Hilti Channel Bolts
(HBC-C, HBC-T and HBC-C-N).
14. Design
Example
Conduct of tests (locking channel bolts in combination with
nonserrated channels and serrated channels in combination
with matching serrated channel bolts):
ϕN sl ≥ N aua
The Test No. 2 of AC232 is performed
to determine the strength of local
rupture of the channel lips. Test No. 2
the anchors shall be tested in a tension
test rig without being cast into concrete (See Figure 7.3.1.2).
Insert the channel bolt over one anchor and apply the load
directly to channel bolt without a fixture.
Figure 7.3.1.2 — Tension test setup for testing anchor channels in a
universal testing machine. (Figure taken from AC232, Figure 5.5).
The failure load, the corresponding displacement, and the failure
mode shall be recorded.
Figure 7.3.1.3 — Test setup for tests in accordance with table 4.1 of AC232,
test No. 5. (Figure taken from AC232, Figure 7.1)
Figure 7.3.1.1 — Tension test for testing anchor channels in a universal
testing machine.
Exception: In Test No. 2 (determination of the channel lip
strength) tests shall be performed with anchor channels with
two anchors cast into low-strength concrete with anchor
spacing s > s min where s min , shall be taken as the value which will
be published in the ICC-ES Evaluation Service Report but shall
not be taken less than 4 inches (100 mm). The distance between
the end of the channel and the anchor axis shall correspond to
the minimum value specified for the tested channel size. Insert
the channel bolt over one anchor and apply the load directly to
the channel bolt. A fixture with the following dimensions shall
be used: width = b ch length = 3b ch , thickness = d f . The fixture
shall be shimmed with steel strips having a thickness = 1/8 inch
(3.2 mm) located on each side of the anchor channel as shown
in Figure 7.3.1.3 below. The diameter of the hole in the fixture
shall be approximately 10 percent larger than the diameter of
the shaft of the channel bolt. The channel bolt shall be pre-
tensioned. However, the support spacing may be reduced to 1.0
h ef in every direction as shown in Figure 7.3.1.4. Direct contact
between the test stand and the channel profile is not permitted.
The average load factor of 1.4 (from 1.2D + 1.6L) divided by the
highest ϕ-factor (0.75 for tension) results in a limit of f uta /f ya of
1.4/0.75 = 1.87. Although not a concern for standard structural
steel anchors (maximum value of f uta /f ya is 1.6 for ASTM A307),
the limitation is applicable to some stainless steels.
13. Field Fixes
The Test No. 1 of AC232 is performed
to determine the strength of the
connection between anchor and
channel. All anchor channel sizes
with all anchor types and all materials are tested. The largest
channel bolt with the maximum steel strength specified for the
tested anchor channel shall be used as a component of the test
specimen to avoid failure of the channel bolt. The anchors shall
be tested in a tension test rig without being cast into concrete.
Insert the channel bolt over one anchor and apply the load
directly to channel bolt without a fixture.
Channel lip strength N sl , and ϕ is
tabulated in Table ESR-3520 Table 8-3
for HAC and HAC-T with Hilti channel
bolts (HBC-C, HBC-T and HBC-C-N).
12. Instructions
for Use
The nominal strength of anchors in tension is best represented
as a function of f uta rather than f ya because the large majority of
anchor materials do not exhibit a well-defined yield point. The
limitation of 1.9f ya on f uta is to ensure that, under service load
conditions, the anchor does not exceed f ya . The limit on f uta of
1.9f ya was determined by converting the LRFD provisions to
corresponding service level conditions.
Channel Lip Strength фN sl
11. Best
Practices
N sa = A se,N f uta
10. Design
Software
The nominal strength N sa , of a single shall
be computed in accordance with Section
17.4.1.2 (ACI318-14) as shown below.
9. Special Anchor
Channel Design
Anchor strength N sa , and ϕ is tabulated
in Table ESR-3520 Table 8-3 for HAC and
HAC-T with Hilti channel bolts (HBC-C,
HBC-T and HBC-C-N).
8. Reinforcing
Bar Anchorage
7.3.1 STEEL TENSILE STRENGTHS
7. Anchor Channel
Design Code
164
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
165
Figure 7.3.1.4 — Example of an unconfined tension test setup for testing
anchor channels (Figure taken from AC232, Figure 5.4).