1. Anchor
Channel Systems
a
b N + V , c , b 1
a
æ N ua
ö
£ 1.0
÷
f
N
nc ø chb 1
è
b Nc , b 1 = ç
æ V ua a , y ö
£ 1.0
÷ ÷
è f V nc , y ø chb 1
b Vc , y , b 1 = ç
ç
æ V a
ö
æ V
a
ua , x
ö
b V , c , xa = ç ç
£ 1.0
÷ ÷
è f V nc , x ø cha , Edi
a
ö
ö
æ V a
÷ + ç ua , x
÷ ÷
ç f V
ø cha , Edi ÷ ø
è nc , x
4. Design
Introduction
5. Base material
6. Loading
a
ö
£ 1.0
÷ ÷
ø chb 1
β N,c highest anchor utilization for tension loading between anchor b 1 of anchor channel b :
•
•
•
•
blow out (N sb )
anchor pull-out (N pn )
concrete breakout (N cb )
anchor reinforcement (if available N ca,s , N ca )
β V,c,y highest utilization under shear loading (perpendicular) b 1 of anchor channel b:
• pryout for perpendicular shear (V cp,y ),
• concrete edge failure (V cb,y )
β V,c,x highest utilization under shear loading (parallel) b 1 of anchor channel b:
• concrete breakout (V cb,x )
• pryout for parallel shear (V cp,x ).
β V,c,x,chj highest utilization for longitudinal shear of channel j for concrete failure involving the edge i.
• concrete breakout (V cb,x )
• concrete breakout for shear parallel to on edge i due to perpendicular shear on edge j
α = 5/3 for channels without reinforcement
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
On other hand, anchor channel can be analyzed using a
simplified method as described below. Here anchor channel a
and b is analyzed individually limiting the side edge distance as
described below.
Simplified method
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. Moreover, if the idealized
failure plane is followed and the corner distance is taken to the
point where the two idealized failure planes overlap. this may
still create unconservative concrete strengths, as the concrete
crack will follow the path of least resistance. Therefore, this
model is only applicable for applications loaded in tension and/
or perpendicular shear.
90° 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 9.2.10.16-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 .
Figure 9.2.10.16-b— Simplified Method-90° Corner — Perpendicular Shear.
Perpendicular 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 9.2.10.16-a. These channels should be analyzed using
a fictitious c a2 of (x/2).
250
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 9.2.10.16-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 .
Figure 9.2.10.16-a— Simplified Method-90° Corner — Tension.
α = 1 with anchor reinforcement to take up tension and parallel shear loads
7. Anchor Channel
Design Code
b Vc , x , b 1 = ç ç ua , x ÷ ÷ £ 1.0
è f V nc , x ø chb 1
ö
æ V a
+ ç ua , x
÷ ÷
ç
ø chb 1 è f V nc , x
3. HAC
Applications
æ æ V a
æ N a ö
ua , y
= ç ua ÷
+ ç ç
ç
è f N nc ø chb 1 ç è è f V nc , y
2. HAC
Portfolio
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
251