1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
Corner distance shall be considered as the shortest distance
between the anchor and the edge. The straight line is drawn
from the end of the headed stud of anchor channel. The line is
extended until it intersects the edge of the acute angle corner.
The point of intersection is extended back to the face of slab
edge as shown in the Figure 9.2.2.8. The side edge distance C a2
is used for analyzing the tension breakout capacity of anchor
channel which reduces the tension concrete breakout capacity
by introducing the corner factor as seen in the equation below.
c cr , N = b ch + 2 c a 1 ³ 1.5 h ef
h
cr, V
= 2c a1 + 2h
5. Base material
£ 1.0
c cr, V = 0.5 × s cr, V = 2c a1 + b ch in .( mm )
y co,V
8. Reinforcing
Bar Anchorage
9. Special Anchor
Channel Design
10. Design
Software
11. Best
Practices
12. Instructions
for Use
13. Field Fixes
14. Design
Example
b 1
y h, V = ç ç
h
æ c a2
= ç
ç c
è cr,V
7. Anchor Channel
Design Code
ESR-3520 Equation (38)
ch
æ h ö
÷
÷
è cr, V ø
6. Loading
Acute corners: Tension analysis
4. Design
Introduction
ö
÷ ÷
ø
ESR-3520 Equation (37)
ESR-3520 Equation (36)
0.5
£ 1.0
ESR-3520 Equation (35)
Figure 9.2.2.11 — Acute corner — Longitudinal shear — Section view.
ESR-3520 Equation (14)
If c a2 < c cr,N
0.5
£ 1.0
ESR-3520 Equation (16)
Figure 9.2.2.12 — Acute corner — Longitudinal shear — Plan view.
9.2.3 — H
AC AND HAC-T DESIGN: FACE OF SLAB OUTSIDE CORNER
WITH PAIR OF ANCHOR CHANNEL LOADED SIMULTANEOUSLY
90° corners
Figure 9.2.2.9 —Acute corner— Perpendicular shear — Section view.
Outside corners where two anchor channels are present and are
loaded simultaneously are outside the scope of AC232. Most of
the AC232 provisions can be applied to this type of application.
However, the influence of the adjacent anchor channel shall
be considered, as the concrete strength may be negatively
impacted.
Figure 9.2.2.8 — Acute corner — Tension.
Figure 9.2.2.10 — Acute corner — Perpendicular shear — Plan view.
Acute corners: Longitudinal Shear analysis
The straight line is drawn limiting the height of the substrate.
The line is extended until it intersects the edge of the acute
angle corner. The point of intersection is extended back to the
face of slab edge as shown in the Figure 9.2.2.11 and Figure
9.2.2.12. By limiting the height of the substrate we will reduce
the A cv in a basic longitudinal shear capacity which in turns
reduces the longitudinal capacity.
V cb, x = ( A vc / A vco ) × ψ ed, V × ψ c, V × ψ h, V × ψ parallel, V .V b
Figure 9.2.3.1 — 90° corner with anchor channels on both sides — Failure
planes does not intersect.
Tension
For the concrete failure modes in tension, the stresses in the
concrete induced by the two anchors of the anchor channels
closer to the corner change the concrete behavior. The concrete
crack instead of following the idealized failure plane (C cr,N ), it
takes the path of least resistance at the corner. This concept is
illustrated in figure 9.2.3.2.
Hilti uses applicable provisions of AC232 to analyze this
type of anchor application. To account for the influence of
the adjacent corner anchor channel, the corner distance is
reduced by assuming the concrete crack follows the path of
222
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
223
A path of least resistance line is drawn emitting from the headed
stud a 3 as shown in Figure 9.2.2.9, intersecting thee edge 2 at
90°. A straight line is drawn limiting the height of the substrate
going through the intersection of path of least resistance and
edge 2. This straight line that limits the height of the substrate is
drawn parallel to edge 1 as shown in Figure 9.2.2.9. The distance
of path of least resistance is measured and modelled as c a2 in
profis anchor channel software. By limiting the side edge distance
to c a2 , we will reduce the perpendicular shear capacity. This is
done by introducing stringent corner factor reflecting an acute
angle corner effect. The substrate height is also measured and
modelled in Profis anchor channel software. By limiting the height
of the substrate we will introduce the height reduction factor,
hence further reducing the overall capacity of perpendicular shear.
Please refer to Figure 9.2.2.9 and Figure 9.2.2.10.
The concrete at the corner is shared by the two anchor channels
and therefore, using the AC232 provisions with the actual corner
distance for analysis purposes can yield very unconservative
concrete strengths. The crack will propagate along the path
of least resistance at the corner instead of following idealized
failure plane. Figure 9.2.3.1 shows an example of a FOS corner,
where anchor channels are installed at the distance away from
the corner that the failure planes do not intersect, hence there
will not be any reduction in concrete breakout capacity in
tension. A side edge distance of h eff + C cr,N at the corner should
be provided to make sure that the planes do not intersect.
Acute corners: Perpendicular Shear analysis
æ c ö
then y co,N = ç a2 ÷
ç c ÷
è cr,N ø