1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
Loading of Anchor Channels
6. Loading
Where compliance is sought for static shear loading along the
longitudinal axis of the anchor channel, the longitudinal loads
shall be transferred by a positive load transfer mechanism
[e.g. mechanical interlock between the channel bolt and the
channel profile by notches in the smooth channel lips created
by notching channel bolts (example see Fig. 7.2.3.2a) or by
matching serrations between the channel lips and channel bolt
(example see Fig. 7.2.3.2b)].
8. Reinforcing
Bar Anchorage
9. Special Anchor
Channel Design
10. Design
Software
11. Best
Practices
12. Instructions
for Use
14. Design
Example
13. Field Fixes
7.2.4 ANCHOR CHANNEL BEHAVIOR UNDER LOAD
When loaded to failure, anchor channels may exhibit one or
more identifiable failure modes.
These include:
Possible failure modes of anchor channel per AC232
Steel
Shear (ΦV n,y )
Concrete
Steel
Concrete
Tension (ΦN n )
Shear (ΦV n,x )
Steel
Concrete
Transfer of shear load in the direction of the longitudinal channel
axis from the channel bolt via channel and anchors into the
concrete shall use a positive load transfer mechanism that shall
be capable of ensuring safe and effective behavior under normal
and adverse conditions, both during installation and in service.
Factors included are installation conditions in concrete and
torqueing of the channel bolt.
7. Anchor Channel
Design Code
Where compliance is sought for seismic loading in Seismic
Design Categories C, D, E and F compliance for shear loads in
the direction of the longitudinal channel axis is required.
The anchor channel may be used to transmit tensile loads,
shear loads perpendicular to the longitudinal channel axis,
shear loads acting in the direction of the longitudinal channel
axis (optional), or any combination of these loads applied at any
location between the outermost anchors of the anchor channel
in accordance with Figure 7.2.3.1 as shown. Transfer of tension
loads takes place via interlock between the channel bolt and
the channel lips, bending of the channel, tension in the anchors,
and mechanical interlock with the concrete. Shear loads
perpendicular to the longitudinal channel axis are transferred
by the anchors and by compression stresses between the
side of the channel and the concrete. However, for reasons of
simplicity, it is assumed that the shear loads are transferred
by the anchors only [see D.3.1.1.3 (ACI 318-05, ACI 318-08),
D.3.1.2.3 (ACI 318-11), Section 17.2.1.2.3 (ACI 318-14)]. Shear
loads acting in the direction of the longitudinal channel axis are
assumed to be transferred from the channel bolt via the channel
and the anchors into the concrete without consideration of
friction and/or adhesion [see D.3.1.1.5 (ACI 318-05, ACI 318- 08),
D.3.1.2.5 (ACI 318-11), Section 17.2.1.1.5 (ACI 318-14)].
5. Base material
7.2.3 A
NCHOR CHANNEL WORKING
PRINCIPLES
4. Design
Introduction
N ua
a) HAC with HBC-C
b) HAC with HBC-C-N
Superposition of tension and shear loads
(up to 5 interaction equations)
IMPORTANT! Failure analysis modes evaluated follow ACI 318-14,
chapter 17. This DOES NOT include evaluating the base material (e.g.
edge-of-slab) capacity to resist compressive forces generated by
the fixture. The engineer must ALWAYS verify the base material (e.g.
edge-of-slab) design is capable of resisting the applied loading.
For additional information, please contact Hilti at [email protected]
154
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
155
Figure 7.2.3.1 — Anchor channel loaded in three directions.
c) HAC-T with HBC-T
V ua,x
V ua,y