1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
HAC and HAC-T
Hilti Anchor Channels with rounded head anchors are
characterized by been the most cost-effective anchor channel
type. Additionally, due to its lighter weight, they are generally
easier to install than anchor channels with reinforcing bars.
These are excellent anchor channel systems with optimized
steel components. The HAC portfolio allows for a gradual
increase in performance. Moreover, they can be installed as
close as 2” away from an edge. This anchor channel type is
covered by ICC ESR-3520.
HAC and HAC-T have optimized components (i.e. channel profile
thickness) that allow the steel performance of the product (i.e.
channel lip strength) to be similar to the concrete performance
6. Loading
(i.e. concrete breakout strength in tension) when used in typical
concrete compressive strength (4000 psi – 5000 psi).
The design of this type of anchor channel is generally limited
by the tensile strength and fracture energy of the concrete.
Therefore, concrete breakout strength in shear (top of slab
applications), concrete breakout strength in tension (face of
slab applications), or a combination of both are generally the
governing failure modes. Technically speaking, the substrate’s
strength tends to be the limiting factor.
7. Anchor Channel
Design Code
8. Reinforcing
Bar Anchorage
9. Special Anchor
Channel Design
10. Design
Software
HAC CRFoS U
HAC CRFoS U stands for Hilti Anchor Channel Corner Rebar
Face of Slab Universal. In contrast to HAC, HAC CRFoS U has
reinforcing bars instead of rounded head anchors. By replacing
the rounded head anchors with reinforcing bars, the concrete
breakout in tension is precluded. This allows the anchor
channels to transfer higher tension forces to the concrete
member or substrate. The reinforcing bar transfer the loads to
the surrounding concrete via interlocking of the reinforcing bar.
The substrate's strength may limit the use of these types
of anchor channels in applications with high loads in low to
medium concrete compressive strengths, lightweight concrete,
thin substrate, close to an edge, and/or close to a corner. The use of HAC CRFoS U is ideal for applications where the
applied tensile force exceeds the concrete breakout strength
in tension. Although concrete pry-out is precluded when
reinforcing bars are used instead of rounded head anchors,
the concrete breakout strength in shear is not impacted by the
reinforcing bar anchors.
Performance Index Tension
Comparison based on a 10"
thick slab, edge distance
of 4", 4000 psi NWC, 11.8"
long HAC with no influence
of a corner.
12. Instructions
for Use
13. Field Fixes
14. Design
Example
The design model of HAC CRFoS U is based on AC232
principles. All failure modes are based on AC232 except the
pull-out strength of the reinforcing bar, which is calculated in
accordance with ACI 318. Steel strengths not covered in ESR-
3520 are based on ACI 318 and applicable testing protocols of
AC232.
HAC CRFoS U comes with one diameter reinforcing bars offset/
bend. This allows to position two CRFoS U in a corner. One
channel is rotated 180° to avoid clashing of the reinforcing bar.
Moreover, the offset of the reinforcing bar allows for extra rebar
cover in composite slab applications where the reinforcing bars
may extend into the metal deck zone The use of HAC CRFoS U
is not limited to corner applications.
HAC CRFoS U is commonly utilized in applications with high
tension loads, thin slabs, lightweight concrete, low concrete
compressive strength, and corners.
Performance Index
Comparison based on a 6" thick slab, edge distance of 3", 4000 psi NWC, 11.8""
in the face of slab with no influence of a corner.
Comparison based on the lowest
strength considering the anchor,
anchor-channel connection, and
channel lip.
11. Best
Practices
Shear
5. Base material
1.2.3 H
ILTI ANCHOR CHANNELS TYPES
4. Design
Introduction
Tension
Comparison based on the
lowest strength considering
the anchor, anchor-channel
connection, and channel lip.
State-of-art design based on ICC ESR-3520.
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Comparison based on t-bolt
spacing of 6", 11.8" long HAC,
4000 psi and no influence of a
corner or edge.
State-of-art design model based on ICC ESR-3520 and principles of AC232 and ACI 318. 19 out of 20 possible failure
modes are calculated in accordance with AC232.
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
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