1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
4. Design
Introduction
5. Base material
6. Loading
90 Degree Corner Shear: PROFIS Anchor Channel has the "activate corner"
option which gives us an opportunity to design the corner.
The difference between the design of anchor channels at the
corner is that when it comes to the concrete breakout check in
perpendicular shear, the capacity is reduced by 20% because
of overlapping of the concrete breakout failure planes in
perpendicular shear as shown Figure 9.3.3.3. Not multiplying
by the corner factor will result in unconservative results for the
breakout capacity in perpendicular shear. Please refer Anchor
channel theory for more information on concrete breakout in
shear.
Hilti HAC CRFoS U has a one diameter kink to help facilitate
installing the anchor channels as close possible to the corner.
This helps the installation of t-bolts close to the corner and
hence reduces the length of the bracket used. The anchor
channel is pushed away from the corner edge so that the rebars
do not intersect at the corner. Please refer to chapter 2 Table
2.2.5.3 for the minimum side edge distance of various CRFoS U
channels.
Please refer section 9.2.3 for detail method of analyzing
perpendicular and longitudinal shear for a face of slab 90
degree angle corner with anchor channels on both sides. The
section 9.2.3 describes method that includes the influence of
the anchor channel on the other side of the corner.
12. Instructions
for Use
13. Field Fixes
14. Design
Example
Acute Angle Corner
The difference between the behavior of
headed stud anchor channel and anchor
channel with rebar anchors is that having
rebars precludes the concrete breakout
cone in tension and pryout. The only
determining factor of the side edge
distance C a2 is the concrete breakout in
shear.
Shear: In order to the determine c a2
dimension it is recommended to have a
line drawn parallel to edge at a distance
h cr,V , the intersection point of this line is
projected back to the edge as illustrated
in Figure 9.3.3.4. The shaded concrete
region of the Figure 9.3.3.4 is neglected
in analysis in order to take into account
the effect of the acute angle corner.
Model the 90 degree corner with c a2 as
the side edge distance to the closest
anchor in the PROFIS Anchor Channel
software. The concrete breakout strength
in shear is reduced by 20% to take into
account the utilization of concrete twice
in shear following the simplified method
of analysis. Please refer section 9.2.3 for
detail method of analyzing perpendicular
and longitudinal shear for a face of slab
acute degree angle corner with anchor
channels on both sides. The section
9.2.3 describes method that includes the
influence of the anchor channel on the
other side of the corner.
Tension: It is made sure that the available
rebar length is 12” following the ACI
provisions for minimum length in order to
rely on rebar theory for transfer of tensile
force. The tension analysis will follow the
section 9.3.1 without having any reduction
in anchorage tension pullout capacity
ΦN pn because of the influence of the other
anchor channel. The cb concrete cover is
taken as minimum of the four s/2, c b1 , c b2
and c b3 dimensions.(s=spacing between
rebars) Refer Figure 9.3.3.4 and Figure
9.3.3.5.
Figure 9.3.3.4 — HAC CRFOS U — Anchor channels on both sides — Acute angle Corner — Plan View.
Figure 9.3.3.5 — HAC CRFOS U — Anchor channels on both sides — Acute angle Corner — Section
View.
Tension: The tension analysis will follow the section 9.3.1 in
determining pullout capacity ΦN pn . The c b concrete cover is
taken as minimum of the four s/2, c b1 , c b2 and c b3 dimensions.
(s=spacing between rebars) Refer Figure 9.3.3.1 and Figure
9.3.3.2.
11. Best
Practices
Figure 9.3.3.3 — HAC CRFOS U — Anchor channels on both sides — 90
degree angle Corner — Reduction factor.
V cb = V b × ψ s, V × ψ co, V × ψ h, V × ψ c, V × ψ corner, V
278
By replacing the headed stud anchors with rebars, the concrete
breakout in tension is precluded. The rebar transfers the loads
to the concrete via interlock.
10. Design
Software
Figure 9.3.3.2 — HAC CRFOS U — Anchor channels on both sides — 90
degree angle Corner — Section View.
9. Special Anchor
Channel Design
Figure 9.3.3.1 — HAC CRFOS U — Anchor channels on both sides — 90
degree angle Corner — Plan View.
8. Reinforcing
Bar Anchorage
9.3.3 — H
AC CRFOS U DESIGN: FACE OF SLAB OUTSIDE CORNER
WITH PAIR OF ANCHOR CHANNEL
7. Anchor Channel
Design Code
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
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