1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
The design strength of anchor channels under the 2015 IBC as
well as Section R301.1.3 of the 2015 IRC must be determined in
accordance with ACI 318-14 Chapter 17 and ESR-3520.
10. Design
Software
11. Best
Practices
12. Instructions
for Use
13. Field Fixes
14. Design
Example
d 1 width of head of I-anchors or diameter of head of
round anchor, in. (mm) as shown in Figure 7.2.2.2 s cr,V critical anchor spacing for shear loading, concrete
edge breakout, in. (mm) N sb nominal concrete side-face blowout strength, lbf
(N)
d 2 shaft diameter of round anchor, in. (mm) as shown
in Figure 7.2.2.2 t h thickness of head portion of headed anchor, in. (mm) N 0sb basic nominal concrete side-face blowout strength,
lbf (N)
d a diameter of anchor reinforcement, in. (mm) as
shown in Figure 7.2.2.2
d s
diameter of channel bolt, in. (mm)
e 1 distance between shear load and concrete surface,
in. (mm)
e s distance between the axis of the shear load and
the axis of the anchor reinforcement resisting the
shear load, in. (mm)
w A
width of I-shaped anchor, in. (mm)
x distance between end of channel and nearest
anchor, in. (mm)
z internal lever arm of the concrete member, in. (mm)
A brg bearing area of anchor head, in. 2 (mm 2 )
A i ordinate at the position of the anchor I, in. (mm)
A se,N effective cross-sectional area of anchor or channel
bolt in tension, in. 2 , (mm²)
f distance between anchor head and surface of the
concrete, in. (mm) A se,V effective cross-sectional area of channel bolt in
shear, in. 2 , (mm²)
f′ c I y moment of inertia of the channel about principal
y-axis, in. 4 (mm 4 )
specified concrete compressive strength, psi (MPa)
h thickness of concrete member or test member, as
shown in Figure 7.2.2.2, in. [mm]
height of channel, as shown in Figure 7.2.2.2, in. (mm)
h cr,V critical member thickness, in. (mm)
h ef effective embedment depth, as shown in Figure
7.2.2.2, in. (mm)
M s,flex nominal flexural strength of the anchor channel,
lbf-in (Nm)
M ss
ominal flexural strength of the channel bolt, lbf-in
n
(Nm)
N ss nominal tensile strength of a channel bolt, lbf (N)
N aua factored tension load on a single anchor of the
anchor channel, lbf (N)
N aua,i factored tension load on anchor i of the anchor
channel, lbf (N)
N sua
factored tension load on a channel bolt, lbf (N)
N ua,re factored tension load acting on the anchor
reinforcement, lbf (N)
T allowable,ASD allowable tension load for use in allowable stress
design environments, lb (N)
T inst Installation torque moment given in Hilti’s
installation instruction, lbf-in. (N-m)
V allowable,ASD allowable shear load for use in allowable stress
design environments, lb (N)
V b basic concrete breakout strength in shear of a
single anchor, lbf (N)
k cp pryout factor c a edge distance of anchor channel, measured from
edge of concrete member to axis of the nearest
anchor, in. (mm) ℓ A length of I-anchor or headed anchor, plus channel
height, in. (mm) N b basic concrete breakout strength of a single
anchor in tension, lbf (N) ℓ lever arm of the shear force acting on the channel
bolt, in. (mm) N ca nominal strength of anchor reinforcement to take
up tension loads, lbf (N) V ca,x nominal strength of the anchor reinforcement of
one anchor to take up shear loads in longitudinal
channel axis, lbf (N)
ℓ dh development length in tension of deformed bar or
deformed wire with a standard hook, measured
from critical section to outside end of hook, in.
(mm) N cb concrete breakout strength of a single anchor of
anchor channel in tension, lbf (N) V ca,max
maximum value of V ca of one anchor to be used in
design, lbf (N)
N n lowest nominal tension strength from all
appropriate failure modes under tension, lbf (N) V cb,y nominal concrete breakout strength in shear
perpendicular to the channel axis of an anchor
channel, lbf (N)
c a1 edge distance of anchor channel in direction 1, in.
(mm)
c’ a1 net distance between edge of the concrete
member and the anchor channel: c' a1 = c a1 – b ch /2
in. (mm)
c a1,red reduced edge distance of the anchor channel
c a2 edge distance of anchor channel in direction 2, in.
(mm)
c a,max maximum edge distance of anchor channel, in. (mm)
s spacing of anchors in direction of longitudinal axis
of channel, in. (mm)
N pn nominal pullout strength of a single anchor of an
anchor channel in tension, lbf (N)
c cr edge distance required to develop full concrete
capacity in absence of anchor reinforcement, in.
(mm) s cr anchor spacing required to develop full concrete
capacity in absence of anchor reinforcement, in.
(mm) N nc nominal tension strength of one anchor from all
concrete failure modes (lowest value of N cb (anchor
channels without anchor reinforcement to take up
tension loads) or N ca (anchor channels with anchor
reinforcement to take up tension loads), N pn , and N sb )
s cr,N critical anchor spacing for tension loading,
concrete breakout, in. (mm) N ns nominal steel strength of anchor channel loaded in
tension (lowest value of N sa , N sc and N sl ), lbf (N)
c cr,N critical edge distance for anchor channel for
tension loading for concrete breakout, in. (mm) s max maximum spacing between anchor elements in
anchor channels, in. (mm) c cr,Nb critical edge distance for anchor channel for
tension loading, concrete blow out, in. (mm) s min minimum spacing between anchor elements in
anchor channels, in. (mm) N ns,a nominal tension strength for steel failure of anchor
or connection between anchor and channel (lowest
value of N sa and N sc )
c cr,V critical edge distance for anchor channel for shear
loading, concrete edge breakout, in. (mm) s cr,Nb critical anchor spacing for tension loading,
concrete blow-out, in. (mm)
c ac edge distance required to develop full concrete
capacity in absence of reinforcement to control
splitting, in. (mm)
156
N sa nominal tensile steel strength of a single anchor, lbf
(N)
V cb,x nominal concrete breakout strength in shear in
longitudinal channel axis of an anchor channel, lbf (N)
V cp,y nominal pry-out strength perpendicular to the
channel axis of a single anchor, lbf (N)
V cp,x nominal pry-out strength in longitudinal channel
axis of a single anchor, lbf (N)
V n,y lowest nominal steel strength from all appropriate
failure modes under shear perpendicular to the
channel axis, lbf (N)
V n,x lowest nominal steel strength from all appropriate
failure modes under shear loading in longitudinal
channel axis, lbf (N)
V nc nominal shear strength of one anchor from all
concrete failure modes (lowest value of V cb ) anchor
channels with anchor reinforcement to take up
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
157
s chb clear distance between channel bolts in direction
of longitudinal axis of channel, in. (mm)
N p pullout strength of a single anchor of an anchor
channel in tension, lbf (N)
V ca,y nominal strength of the anchor reinforcement of
one anchor to take up shear loads perpendicular to
the channel axis, lbf (N)
c a,min minimum edge distance of anchor channel, in. (mm)
ℓ in influence length of an external load Nua along an
anchor channel, in. [mm]
M u,flex bending moment on the channel due to tension
loads, lbf-in (Nm)
load distribution factor (17.2.1.2.1a, ACI 318-14) k b ch width of channel, as shown in Figure 7.2.2.2, inch
(mm)
h ef,red reduced effective embedment depth, in. (mm)
(17.4.2.10.2c, ACI 318-14)
M 2 bending moment on fixture around axis in direction
2, lbf-in (Nm)
N sl nominal tensile steel strength of the local bending
of the channel lips, lbf (N)
h ch
M 1 bending moment on fixture around axis in direction
1, lbf-in (Nm)
N sc nominal tensile steel strength of the connection
channel/anchor, lbf (N)
Equations are provided in units of inches and pounds. For
convenience, SI (metric) units are provided in parentheses
where appropriate. Unless otherwise noted, values in SI units
shall be not used in equations without conversion to units of
inches and pounds.
9. Special Anchor
Channel Design
7.2.6 STRENGTH DESIGN TERMINOLOGY
8. Reinforcing
Bar Anchorage
The design strength of anchor channels under the 2006 IBC
as well as Section R301.1.3 of 2006 IRC must be determined in
accordance with ACI 318-05 Appendix D and ESR-3520.
7. Anchor Channel
Design Code
The design strength of anchor channels under the 2009 IBC as
well as Section R301.1.3 of the 2009 IRC must be determined in
accordance with ACI 318-08 Appendix D and ESR-3520.
6. Loading
The design strength of anchor channels under the 2012 IBC as
well as Section R301.1.3 of the 2012 IRC must be determined in
accordance with ACI 318-11 Appendix D and ESR-3520.
5. Base material
7.2.5 A
CI 318 CHAPTER 17 STRENGTH DESIGN
— SD (LRFD)
4. Design
Introduction