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
least resistance and considering the corner distance where the
“crack” of each anchor channel overlaps. The shaded area for
90° angle outside corner with anchor channel with studs, the
true side edge can be used once in an analysis of one of the
two channel as shown in Figure 9.2.3.3. Concrete breakout in
tension check for Channel a, the side edge is C
a2,a
is used in
the analysis. Concrete breakout tension check for Channel b,
the true side edge is C
a2,b
is used in the analysis. This has been
illustrated in Figure 9.2.3.3. The total distance of (a+b) can be
divided between the two channels, while analyzing the individual
channels. For example if channel a is loaded more than channel
b than side edge distance of 3/4(a+b) can be assumed for
channel a and side edge distance 1/4(a+b) can be assumed for
channel b.
Figure 9.2.3.2 — 90° corner with anchor channels on both sides —
overlapping of tension failure planes.
Figure 9.2.3.3 — 90° corner with anchor channels on both sides — Detail
showing the edge distance that needed be used in analysis.
Perpendicular shear analysis
In simplified analysis concrete breakout perpendicular shear
check at outside corner for Channel a or b, the side edge
distance of true edge is considered for analysis with multiplying
corner reduction factor of 0.8 to the perpendicular shear
capacity. True side edge distance is the distance from the
anchor to the edge at the corner.
On other hand detailed analysis can be performed which
takes into account the effect of adjacent anchor channel with
headed studs. This is incorporated in modification spacing
factor ψ
s,v
as described below. The diagonal distance from the
second channel is taken into consideration along with the ratio
of the shear load that each of the anchor has over anchor in
consideration. Side edge used in the analysis will remain the
true side edge distance. Determination of the critical spacing
s
cr,V
:
=
4
()
+ 2
,-
2
; 2
()
+ 2ℎ
,-
Considering the linear distance between the anchors as s
i
=
"
=
"
−
&
'
+
"
−
&
'
is equivalent to use a circular idealized
breakout body. Condition to ensure the same area as for the
rectangles:
n
1
= number of anchors of channel 1
n
2
= number of anchors of channel 2
"
=
"
−
&
'
+
"
−
&
'
ψ
s,V
modification factor for spacing influence for 90° angle
corner: Example of spacing factor ψ
s,v
calculation for a
1
. Please
refer to Figure 9.2.3.7 for understanding the distance of anchor
a
1
from anchor b
1
, b
2
and b
3
as well as anchor a
2
and a
3
. The
shear force experienced by theses anchors.
b = max c
'()
;h
'()
s
"#,%
= 2 ∗
2
π
b = 2 ∗ 1.13b
s,v,a1
1.5 1.5 1.5 1.5
b,1,1 , 1 b,1,2 , 2 b,1,3 , 3 a,1,2 , 2
cr,v , 1 cr,v , 1 cr,v , 1 cr,v , 1
1
ss ss
11 1 1 1
ssss
aa aa
ua b ua b ua b ua a
aaaa
ua a ua a ua a ua a
VVVV
VVVV
y
=
é ùé ùé ùé ù
æö æö æö æö
ê úê úê úê
+ -×+ -×+ -×+ -×
ç÷ ç÷ ç÷ ç÷
ç÷ ç÷ ç÷ ç÷
ê úê úê úê
èø èø èø èø
ë ûë ûë ûë û
1.5
a,1,3 , 3
cr,v , 1
s
1
s
a
ua a
a
ua a
V
V
éù
æö
úê ú
+ -×
ç÷
ç÷
úê ú
èø
ëû
Figure 9.2.3.4 — 90° FoS corner with anchor channels on both sides —
Determination of b.
Figure 9.2.3.5 — 90° FoS corner with anchor channels on both sides —
Effect of anchors closest to the edges.
ψ
co,V
modification factor for corner influence for 90° angle
corner: The true edge distance is taken into consideration for
determination of reduction factor for corner distance C
a2,a
or
C
a2,b
is taken as distance in case of a 90° angle corner for corner
anchors a
1
or b
1
respectively.
C
a2
=(C
a2,a
) distance of the anchor a
1
under consideration to the
corner (see Figure 9.2.3.7).
2, ,
0.5
2,
2, ,
,
1.0
1.0
a cr v co V
aa
a cr v co V
cr V
If C C than
C
If C C than
C
y
y
³ =
æö
<=£
ç÷
ç÷
èø
,1
,, 1
24
0.5 2
cr v ch a
cr v cr v ch a
S bC
C S bC
=+
= =+
Figure 9.2.3.6 — 90° FoS corner with anchor channels on both sides — S
cr,v
.
Figure 9.2.3.7.a — 90° FoS corner with anchor channels on both sides —
Plan view.
Figure 9.2.3.7.b — 90° FoS corner with anchor channels on both sides —
Example of determination of ψ
s,v,a1
— Section view.