HAC_Technical-Guide
64 65
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
2.1 HAC
Nomenclature
2.2 Geometric Parameters 2.3 Structural Performance
2.4 Ordering
Information
2.5 Standard
Portfolio
2.6 HAC Custom
Solutions
HAC
HAC
CRFoS U
HAC EDGE HBC-C
HAC-T
HAC-30
HAC-T
EDGE
HBC-T
HBC-B
HAC
HAC
CRFoS U
HAC EDGE HBC-C
HAC-T
HAC-30
HAC-T
EDGE
HBC-T
HBC-B
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
Hilti Channel Bolt Length (HBC-C)
Table 2.2.10.2 — Hilti Channel Bolts dimensions
Channel
Bolt
Anchor
Channel
Profile
Units
Dimensions
Channel
bolt
length
Diameter ø b
1
b
2
k L
HBC-C
HAC-40
HAC-50
HAC-50 S
HAC-60
HAC-70
mm
M12
14
33
(1.30)
10.4 40-200
(in) (0.55) (0.41) (1.57-7.87)
mm
M16
18.5
(0.73)
11.4 40-200
(in) (0.45) (1.57-7.87)
mm
M20
13.9 60-200
(in) (0.55) (2.36-7.87)
Table 2.2.10.3 — Channel lip
thickness
Anchor
Channel profile
Channel lip
thickness, L
th
HAC-40
7/6 4 i n
(2.6 mm)
HAC-50
HAC-50 S
1/8 in
(3.10 mm)
HAC-60
5/32 in
(4.1 mm)
HAC-70
13/64 in
(5.2 mm)
Minimum t-bolt overhang
According to AISC Steel Construction Manual, 13th Edition,
Section 14-10 “Adequate thread engagement for anchor rods is
identical to the condition described in the RCSC Specification
as adequate for steel to steel structural joints using high
strength bolts: having the end of the [anchor rod] flush with or
outside the face of the nut”.
There is no maximum thread protrusion limitation from the
standpoint of the function of the bolt.
If needed, the excess at the end of the bolt can be cut-off. The
nut shall be fully engaged. The outside face of the head of the
t-bolt has special markings to identify the t-bolt type and proper
head orientation of the t-bolt. If the t-bolt is to be cut or grind,
inspect and ensure the orientation and t-bolt type is as specified
prior to any work on the t-bolt. If the marking on the t-bolt are
removed, proper inspection is not possible. Proper corrosion
protection shall be required.
Although there is minimum t-bolt overhang (Lo) can be zero, for
tolerance purposes it is recommended to have a minimum t-bolt
overhang. Table 2.2.10.4 provides the minimum t-bolt overhang
length.
Figure 2.2.10.3 – Overhang of Hilti Channel Bolts (HBC-C).
Table 2.2.10.4 — Recommended t-bolt overhang, L
o
Hilti locking channel
bolt diameter (mm)
Minimum nominal
overhang, L
o
M12
1/8 in
(3 mm)
M16
13/64 in
(5 mm)
M20
9/32 in
(7 mm
Installation torque of HBC-C
Table 2.2.10.5 — Installation torque for Hilti Channel Bolts (HBC-C)
Bolt type Units
Installation torque T
inst
(Installation type A)
1
Installation torque T
inst
(Installation type B)
2
HAC-40 HAC-50 HAC-60 HAC-70 HAC-40 HAC-50 HAC-60 HAC-70
HBC-C M12 8.8
ft-lb
19
(25)
55
(75)
(Nm)
HBC-C M16 8.8
ft-lb
44
(60)
136
(185)
(Nm)
HBC-C M16 50 R
ft-lb
44
(60)
44
(60)
(Nm)
HBC-C M20 8.8
ft-lb
52
(70)
78
(105)
89
(120)
236
(320)
(Nm)
1 Installation type A: The fixture is in contact with the channel profile and the concrete surface
2 Installation type B: The fixture is fastened to the anchor channel by suitable steel part (e.g. square plate washer), fixture is in contact with the channel profile only
Hilti Locking Channel Bolts (HBC-C-N) are suitable for channel
profiles HAC-40, HAC-50, HAC-60, & HAC-70. HBC-C-N come
in bolt diameters M12, M16, and M20, steel grade 8.8, and HDG
finishing. All HBC-C-N are covered by ESR-3520.
HBC-C-N can be used to transfer tensile loads, shear loads
perpendicular to the longitudinal channel axis, longitudinal
shear forces, or any combination of these loads. Transferring the
loads takes place via interlock between the head of the HBC-
C-N and the channel lips.
Longitudinal load transfer mechanism
The inside head of the HBC-C-N has 4 hardened notches.
After the required installation torque is applied, the head of
the t-bolt “bites” into the channel lips, creating four (4) - 2 mm
deep “notches” in the channel lip. Hence, a positive connection
between channel lip and t-bolt head is created. The longitudinal
shear resistance of the HBC-C-N and HAC is achieved via
mechanical interlock between the channel lips and head of
the notched bolt. The load transfer mechanism ensures full
load capacity, even if the nut experiences up to 50 percent
relaxation.
The notches created in the channel lips reduce the moment of
inertia of the channel profile. Therefore, the flexural strength
of the anchor channel in tension is reduced by 10-15 percent,
depending on the anchor channel profile size. Corrosion of the
notches is not a concern due to the tight sealing that occurs
during the installation torque.
Figure 2.2.11.1 — Head of Hilti Locking Channel Bolt (HBC-C-N).
Can longitudinal shear loads be resisted via
friction?
Although longitudinal shear forces may be justified via friction,
AC232 requires a positive connection between T-bolt and
channel lip. Due to different installation uncertainties, long-term
relaxation, and performance variance, Hilti does not recommend
the use of friction as a means of transferring longitudinal loads,
especially seismic loads.
Figure 2.2.11.2 — Friction.
Special channel bolt markings
Special markings on the t-bolt aid the installer to ensure the bolt
is properly positioned before the installation torque is applied.
Moreover, it allows the installer and inspector to identify the
type of bolt, after the fixture is installed.
Figure 2.2.11.3 — T-bolt marking.
2.2.11 HILTI LOCKING CHANNEL BOLTS: HBC-C-N