HAC_Technical-Guide

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Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
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
13. Field Fixes
14. Design
Example
9.1 Overview of Hilti Anchor Channel Systems Design
9.2 HAC and HAC-T Design 9.3 HAC CRFoS U Design 9.4 & 9.5 Post Tensioned Slabs 9.6 HAC EDGE Design
Acute and obtuse corners
Acute Corner:
Tension: 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 least resistance and
considering the corner distance where the “crack” of each
anchor channel overlaps. 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 generates
a concrete cone with the radius of c
cr,N
. The distance between
the closest anchor heads is defined as x, as shown in the Figure
9.2.10.17-a. These channels should be analyzed using a fictitious
c
a2
of (x/2). To evaluate channel a and b the anchor channel is
modelled in Profis anchor channel software with c
a2
of x/2. With
limiting the edge the concrete breakout strength in tension is
reduced by the modification factor for corner effect ψ
co,N
.
Perpendicular shear: For the concrete failure modes in shear,
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 does not follow the idealized
failure plane (c
cr,V
) but the path of least resistance. This concept
is illustrated in Figure 9.2.10.17-b. The fictitious edge can be
taken in between the distance (a+b) for analyzing the anchor
channel a and b depending on whichever anchor channel
needed more concrete. To evaluate channel a and b the anchor
channel is modelled with c
a2
distance of in between distance
(a+b). With limiting the edge the concrete breakout strength in
shear is reduced by the modification factor for corner effect
ψ
co,V
. Channel a is evaluated using c
a2,a1
and channel b can be
evaluated using c
a2,b1
.
Acute outside corners with headed stud HAC channel loaded
only in tension or in all three directions: The distance between
the closest anchor heads is defined as x, as shown in the Figure
9.2.10.17-a. These channels should be analyzed using a fictitious
c
a2
of (x/2).
Figure 9.2.10.17-a — Simplified Method — Acute Corner — Tension.
Figure 9.2.10.17-b — Simplified Method — Acute Corner — Perpendicular
Shear.
Obtuse Corner:
Tension: 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 least resistance and
considering the corner distance where the “crack” of each
anchor channel overlaps. 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 generates
a concrete cone with the radius of c
cr,N
. The distance between
the closest anchor heads is defined as x, as shown in the
Figure 9.2.10.18-a. These channels should be analyzed using
a fictitious c
a2
of (x/2). To evaluate channel a and b the anchor
channel is modelled in Profis anchor channel software with c
a2
of x/2. With limiting the edge the concrete breakout strength in
tension is reduced by the modification factor for corner effect
ψ
co,N
.
Perpendicular shear: For the concrete failure modes in shear,
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 does not follow the idealized
failure plane (c
cr,V
) but the path of least resistance. This concept
is illustrated in Figure 9.2.10.18-b. The fictitious edge can be
taken in between the distance (a+b) for analyzing the anchor
channel a and b depending on whichever anchor channel
needed more concrete. To evaluate channel a and b the anchor
channel is modelled with c
a2
distance of in between distance
(a+b). With limiting the edge the concrete breakout strength in
shear is reduced by the modification factor for corner effect
ψ
co,V
. Channel a is evaluated using c
a2,a1
and channel b can be
evaluated using c
a2,b1
.
Obtuse angle corners with headed stud HAC channel loaded
only in tension or forces in all three directions: The distance
between the closest anchor heads is defined as x, as shown in
Figure 9.2.10.18-a. These channels should be analyzed using a
fictitious c
a2
of (x/2).
Figure 9.2.10.18-a — Simplified Method — Obtuse Corner — Tension .
Figure 9.2.10.18-b — Simplified Method — Obtuse Corner — Perpendicular
Shear