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
Obtuse angle Corner: Obtuse corner has been drawn in
Figure 9.2.10.14a. The corner is unfolded in Figure 9.2.10.14b.
Please refer to the distance marked on the detail for obtuse
angle corner case. The variable a and b has been defined
and marked up on figure representing obtuse angle corner
condition. The dimension b is evaluated by measuring a line
emitting from anchor b
1
and having it perpendicularly intersect
edge 1, this distance is c
a2,b1
. The dimension b is evaluated by
taking difference between c
a2,b1
and c
a1,a
. The side edge distance
c
a2,b1
or c
a2,a1
is used as side edge distance. While unfolding the
corner for this case the fictitious distance of (a+b) is taken into
consideration while placing them (a+b) apart as shown in Figure
9.2.10.14b.
Lets take into consideration anchor b
1
of anchor channel b
with shear V
a
ua,b1
. Please refer Figure 9.2.10.14b. The following
equation modification factor for spacing is used.
s,v,b1
1.5 1.5 1.5
, 1 1; 2 , 2 1; 2 , 2
cr,v , 1 cr,v , 1 cr,v , 1
1
(a+b+a ) a
(a+b)
11 1 1
sss
a aa
ua a a a ua a b b ua b
a aa
ua b ua b ua b
V VV
V VV
y =
é ùé ùé ù
æ ö æ ö æö
ê úê úê ú
+ -×+ -×+ -×
ç ÷ ç ÷ ç÷
ç ÷ ç ÷ ç÷
ê úê úê ú
è ø è ø èø
ë ûë ûë û
For the condition illustrated below in Figure 9.2.10.14b the
shear breakout plane emitting from anchor b
1
overlaps shear
plane emitting from anchor a
1
, a
2
and b
2
, hence the spacing
modification factor will be the equation above for the example in
the Figure 9.2.10.14b.
ψ
co,V
modification factor for corner influence for obtuse angle
corner:
The side edge distance is taken into consideration for
determination of reduction factor for corner distance c
a2
. The
c
a2,b1
or c
a2,a1
is taken as side edge distance.
c
a2
= c
a2,b1
or c
a2,a1
side distance of the anchor b
1
or a
1
to the
corner respectively (see Figure 9.2.10.14b).
1.0
c
c
cc If
1.0
cc If
0.5
Vcr,
a2
Vco,
Vcr,a2
Vco,
Vcr,a2
£
÷
÷
ø
ö
ç
ç
è
æ
=
<
=
³
y
y
then
then
1
,
,,
24
0.5 1.5
ch a
cr V
cr V cr V ef
s bC
c sh
=+
= ³
1
,,
0.5 2ch a
cr V cr N
c s bc= =+
Figure 9.2.10.14a — Obtuse angle Corner. Figure 9.2.10.14b — Unfolding of Obtuse angle Corner.
Concrete side-face blow out
The concrete side blowout is calculated with the same
verification of ESR3520:
a
uasb
NN ³ f
Nbc,Nbh,Nbco2,Nbco1,Nbg,
0
sbsb
ψ.ψ.ψψψNN ×××=
a
uasb
NN ³ f
Nbc,Nbh,Nbco2,Nbco1,Nbg,
0
sbsb
ψ.ψ.ψψψNN ×××=
With the only differences:
1
Nbco2,
= y
Since the second corner is not available
0.1
N
N
s
s
11
1
1n
2i
ua,1
a
iua,
a
1.5
Nbcr,
i
Nbs,
£
ú
ú
û
ù
ê
ê
ë
é
×
÷
÷
ø
ö
ç
ç
è
æ
-+
=
å
+
=
y
n = n
ch1
+ n
ch2
is the number of all the anchors of the two
channels
s
i
is the relative distance of two anchors,
considering all the anchor on an imaginary
“unfolded” channel, where the first anchor of
the second channel, is located at a distance
d
∗
from the last anchor of the first (Figure
9.2.10.11)
Concrete breakout strength for parallel shear
The concrete breakout strength for parallel shear is calculated
according ESR for both channels are verified independently.
The concrete utilization of both edges is then combined in
conservative way as described in the next paragraph.
Concrete failure, load interaction
Every anchor already considers the second channel for tension
and perpendicular shear. The governing failure modes in the
three directions are combined according to the following
method. Refer Figure 9.210.15.
A verification for each anchor of both anchor channel is needed.
ch, a is the channel of the considered anchor
ch, b indicate the other channel
Ed, i is the edge parallel to the channel of the considered anchor
Ed, j indicate the edge parallel to the other channel
Considering the channel b, tension and perpendicular shear
of the channel b are considered “precisely” as described.
Longitudinal shear of the channel itself is considered according
to ESR3520. The effects of the channel a due to longitudinal
shear on the channel b is difficult to consider. Therefore, on
the safe side, the highest utilization for longitudinal shear of
channel b on the edge i is added linearly to the utilization of
perpendicular shear of the considered anchor. Longitudinal
shear on the channel b is calculated according to ESR3520.
Verification of the anchors of the channel b.
Figure 9.2.10.15 — Interacting tension with perpendicular shear and
longitudinal shear.