1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
4. Design
Introduction
5. Base material
6. Loading
7. Anchor Channel
Design Code
8. Reinforcing
Bar Anchorage
9. Special Anchor
Channel Design
10. Design
Software
What is the minimum channel bolt (t-bolt)
spacing, S ch,b ?
What is an anchor channel system What are the anchor channel requirements
according to AC232?
3 x d s Where d s is the diameter of channel bolt refer figure 7.2.2.2
Anchor channels consist of a channel produced from hot-rolled
or cold-formed steel and at least two metal anchors on the
channel web as illustrated in Figure 7.2.2.1.
The maximum effective embedment according to AC 318-14
section 17.4.2.2, h ef = 25 in.
Geometry requirements: h ch /h ef ≤ 0
.5
b ch /h ef ≤ 0.70
The fixture being attached
T-bolts attaching the fixture to the channel
Steel channel cast into a concrete element
Anchor elements attached to the channel and embedded into
the concrete
Elevation view of an anchor channel system.
The anchor channels shall be placed flush with the concrete
surface as illustrated in Figure 7.2.2.2. A fixture shall be
connected to the anchor channel by channel bolts (also known
as T-bolts) with nut and washer in accordance with Figure7.2.2.1
and Figure 7.2.2.2.
Deformed reinforcing bars as defined in section 2.3 of ACI
318-14 may be attached to the channel in lieu of anchors as
described above.Deformed reinforcement is defined as that
meeting the reinforcement specifications in the model Code. No
other reinforcement qualifies. This definition permits accurate
statement of developent lengths. Where deformed reinforcing
bars are welded, they shall be of a weldable grade.
Deformed bars should conform with ACI 20.2.1.3, 20.2.1.5 or
20.2.1.7. 20.2.1.3:
Deformed bars shall conform a, b, c, d or e.
a) ASTM A615 — carbon steel
b) ASTM A706 — low-alloy steel
(c) ASTM A996 — axle steel and rail steel; bars from rail steel
shall be Type R
(d) ASTM A955 — stainless steel
(e) ASTM A1035 — low-carbon chromium steel
The axial distance between the end of the channel and the
nearest anchor, x, shall be ≥ 1 in. (25.4 mm).
Figure 7.2.2.4 — Anchor channel system (HAC and HBC-C).
Cross-sectional view of an anchor channel
system, A-A'.
The anchors may be welded, forged or bolted to the channel.
All anchors attached to the anchor channel shall be of the same
type, size and embedment.
Figure 7.2.2.3 — Anchor channel.
Round headed anchors shall comply with the following
dimensions: length l A ≥ 19/16 in. (30 mm), shaft diameter d 2 ≥ 1/5
in. (5 mm), and head diameter d 1 ≥ 1/2 in. (12 mm). The head is
forged to the anchor or may consist of a nut.
The elongation and reduction of area of each anchor channel
component (i.e. channel profile, anchor, channel bolt) shall be
determined in accordance with a recognized test standard
(e.g. ASTM F606). If elongation is at least 14 percent and the
reduction of area is at least 30 percent, the anchor channel
component shall be considered to be a ductile steel element. If
the elongation or reduction of area cannot be determined, the
anchor channel shall be considered to be a brittle steel
element.
The anchors shall be placed into prefabricated holes in the back
of the channel and connected rigidly with the channel back.
152
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
153
What are the requirements for round anchors
and deforming rebars under AC232?
Figure 7.2.2.1 — Anchor channel with corresponding channel bolt.
Figure 7.2.2.6 — Section view of an anchor channel system in a concrete
member.
The axial spacing between round headed anchors, s, shall be at
least 2 in. (51 mm). The axial spacing between deformed bars s,
shall be at least 4 in. (100 mm).The maximum spacing, s, shall
not be larger than the smaller of 5 times the minimum edge
distance c min and 16 in. (400 mm). If more than two anchors are
connected to the channel back, their spacing shall be constant.
Cross-sectional view of an anchor channel system, B-B'.
Steel profile with rigidly connected anchors installed prior
to concrete placement. The anchors shall be produced from
carbon or stainless steel. The anchors may be welded, forged
or bolted to the channel. All anchors attached to the anchor
channel shall be of the same type, size and embedment.
member.
What is an anchor channel?
Figure 7.2.2.5 — Plan view of an anchor channel system in a concrete
Figure 7.2.2.2 — Anchor channel system in a concrete member; elevation
and section view.
Minimum number of anchors: 2
Maximum number of anchors: unlimited
Minimum round headed anchor spacing: 2.00 in. (50 mm)
Minimum deformed reinforcing bars anchor spacing: 4.00 in.
(100 mm)
Maximum anchor spacing s: shall not be larger than 5 times
minimum edge distance cmin and 16 in (400 mm)
Spacing between the anchors or deformed reinforcing bars
should be constant.
Minimum allowable slab thickness shall be h min = h ef + t h + c nom
t h = anchor head thickness
c nom = required concrete cover
Cross-sectional view of an anchor channel system, A-A'.
Elevation view of an anchor channel system.
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14. Design
Example
An anchor channel system consists of Minimum channel length: 4 in. (102 mm).
Maximum channel length: unlimited.
13. Field Fixes
Channel height, h ch : 0.60 in. (15 mm) ≤ h ch ≤ 2 in. (51 mm)
Channel width, b ch : 1 in. (25.4 mm) ≤ b ch ≤ 3 in (76 mm).
12. Instructions
for Use
7.2.2 R
EQUIREMENTS OF ANCHOR CHANNEL
WITHIN AC232.
11. Best
Practices