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
11. Best
Practices
12. Instructions
for Use
Table 2.2.2.2 and figure 2.2.2.3 provide information about the
minimum corner distance for pair of HAC. See chapter 9, Anchor
Channel Design for additional design information. 2.2.3 HAC IN TOP AND BOTTOM OF SLAB CORNERS
Single HAC in face of slab corners Table 2.2.2.2 — M
inimum substrate edge and corner
distances for pair of HAC in corners in
normal weight, sand-lightweight and all
light-weight concrete Single HAC in top of slab corner
Minimum c ca2
HAC-40 In (mm) *1.97 (50) 3.70 (94.00)
HAC-50 In (mm) *1.97 (50) 4.31 (109.50)
HAC-60 In (mm) 2.95 (75) 6.01 (152.50)
HAC-70 In (mm) 2.95 (75) 7.09 (180.00)
*For all-lightweight concrete, c a1 = 2.95” (75 mm)
Table 2.2.3.1 — M
inimum substrate edge and corner
distances for single HAC in a corner in
normal weight, sand-lightweight and All
light-weight concrete
Minimum c a2 Anchor
channel Units Minimum c a1 Minimum c a2
HAC-40 In (mm) *1.97 (50) *1.97 (50) HAC-40 In (mm) *1.97 (50) *1.97 (50)
HAC-50 In (mm) *1.97 (50) *1.97 (50) HAC-50 In (mm) *1.97 (50) *1.97 (50)
HAC-60 In (mm) 2.95 (75) 2.95 (75) HAC-60 In (mm) 2.95 (75) 2.95 (75)
HAC-70 In (mm) 2.95 (75) 2.95 (75) HAC-70 In (mm) 2.95 (75) 2.95 (75)
*For all-lightweight concrete, c a1 and c a2 = 2.95” (75 mm)
Minimum c a1 Units Anchor
channel Minimum c a1 Units
Figure 2.2.3.2 illustrates a pair of HAC in a corner. Corner
distances greater than the minimum corner distance may be
required based on the structural adequacy of the concrete at
the corner.
Table 2.2.2.1 — M
inimum substrate edge and corner
distances for single HAC in a corner in
normal weight, sand-lightweight and all
light-weight concrete
Anchor channel
AC232 provides design guidelines to account for the influence of
corners where only one anchor channel is present. The design
of this type of application is covered in ESR-3520. Table 2.2.3.1
provides the minimum edge and corner distances for HAC. HAC
requirements for top and bottom of slab corners are equal.
corner configuration where the anchor channels are installed
perpendicular to each other; see Figure 2.2.3.2.
AC232 provides design guidelines to account for the influence of
corners where only one anchor channel is present. The design
of this type of applications is covered in ESR-3520. Table 2.2.2.1
provides the minimum edge and corner distances for HAC.
14. Design
Example
2.2.2 H
AC IN FACE OF SLAB
CORNERS
13. Field Fixes
*For all-lightweight concrete, c a1 = c a2 = 2.95” (75 mm)
Corner distance c ca2 is measured to the center of the anchor.
Figure 2.2.3.2– Minimum corner distance for pair of HAC in top of slab, plan
view.
Design of Top of Slab Corners
Figure 2.2.2.2 — Minimum corner distances for pair of HAC, plan view.
Figure 2.2.3.3 Corner configuration of pair of HAC in top of slab.
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
49
Figure 2.2.3.3 — Premature concrete cracking due to simultaneous loading
of pair HAC at corner with overlapped anchors, plan view.
Additional measurements shall be taken into consideration
to account for the negative influence of the adjacent anchor
channel, if both channels are to be loaded simultaneously. See
chapter 9, Special Anchor Channel Design for additional design
information.
The minimum corner distances for pair of HAC in top of slab
corners (c ca2 ) are consistent with table 2.2.3.1. These minimum
distances are based on installation requirements. Both HAC
at corners cannot be installed at the minimum corner distance
due to physical constraints (clashing of HAC will occur).
However, two HAC can be installed next to each other in a
view.
AC232 does not include provisions to account for the influence
of an adjacent and/or corner channel. Technically, HAC can be
used in both sides of the corner.
AC232 does not include provisions to account for the influence
of an adjacent channel in a face of slab corner. Technically,
HAC can be used in both sides of the corner, if there is no
overlapping of the anchors.
48
Figure 2.2.3.1– Minimum corner distance for single HAC in top of slab, plan
Pair of HAC in top of slab corners
Pair of HAC in a corner
Additional measurements shall be taken in consideration to
account for the negative influence of the adjacent anchor
channel, if both channels are to be loaded simultaneously.
See chapter 9, Anchor Channel Design for additional design
information. Although this solution is technically feasible,
installing HAC at 4 to 7 inches away from the corner typically
results in unpractical bracket sizes, large eccentricities, large
forces, and consequently, inadequate concrete strengths.
Figure 2.2.2.1– Minimum corner distance for single HAC in face of slab, plan
view.
Corner distance c a2 is measured to the center of the anchor.
Hilti has developed a model to account for the influence
of adjacent and corner channels. The model follows the
fundamentals of AC232 and allows to analyze more complex
but typical applications encountered in a project such as the
conditions shown in Figure 2.2.3.3. See chapter 9, Special
Anchor Channel Design for additional design information.
Corner distance c a2 is measured to the center of the anchor.
For face of slab applications, it is not recommended to
install HAC in both sides of the corner if overlapping of the
rounded head anchors occurs and simultaneous loading will
be experienced. The overlapping of the anchors of the corner
channels creates a weakened failure plane, making the corner
susceptible to premature cracking and reduced concrete
strengths.
Corner distance c ca2 is measured to the center of the anchor.