1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
Seismic tension Seismic Loading (SDC C, D, E and F)
5. Base material
6. Loading
8. Reinforcing
Bar Anchorage
9. Special Anchor
Channel Design
10. Design
Software
11. Best
Practices
ϕ M s,flex,seis ≥ M u,flex The reduced anchor nominal tensile strengths associated with
concrete failure modes is to account for increased cracking and
spalling in the concrete resulting from seismic actions. Because
seismic design generally assumes that all or portions of the
structure are loaded beyond yield, it is likely that the concrete is
cracked throughout for the purpose of determining the anchor
strength. In locations where it can be demonstrated that the
concrete does not crack, uncracked concrete may be assumed
for determining the anchor strength as governed by concrete
failure modes.
Nominal tensile strength of a channel bolt for seismic design
ϕ N ss,seis ≥ N bua
N ss,seis and ϕ are tabulated in Table ESR-3520 Table 8-10
Nominal tensile steel strength for local failure of channel lips for
seismic design
13. Field Fixes
14. Design
Example
Figure 7.5.4.2 — Required load history for simulated seismic shear test
(Figure taken from AC232, Figure 7.7).
Apply a seismic reduction factor (ø seismic ) of 0.75 to non-steel
tension design strengths per ACI 318-14 Section 17.2.3.4.4.
12. Instructions
for Use
ϕ N sl,seis ≥ N bua
N sl,seis and ϕ are tabulated in Table ESR-3520 Table 8-3
Nominal tensile steel strength of a single anchor for seismic
design
Load level N eq N l N m
Number of cycles 10 30 100
taken from AC232, Figure 7.8).
ϕ N sc,seis ≥ N aua Nominal shear steel strength for local failure of the channel lips
for seismic design
N sc,seis and ϕ are tabulated in Table ESR-3520 Table 8-3 ϕ V sl,y,seis and ϕ are tabulated in ESR-3520 Table 8-5
ϕ V sl,y,seis ≥ V bua
Anchors in structures assigned to Seismic Design Category
(SDC) C, D, E, or F shall satisfy the additional requirements
∆w Minimum
No. of
tests Channel Anchor Material
[-] Secion
in Annex
A [-] psi
[N/mm 2 ] inch
(mm) [-] [-] [-] [-]
Channel bolt
d s strength
inch
(mm) [-]
Seismic Tests
7.12 Seismic tension Low 0.020
(0.5) 5 see Section 7.12.2 1
13 7.13 Seismic shear perpendicular
to the channel profile Low 0 5 see Section 7.13.2 1
14 7.14 Seismic shear in longtitudinal
channel axis Low 0.020
(0.5) 5 see Section 7.15.2 1
Table 7.1-b — R
equired load history for simulated seismic
shear test
Load level ∓V eq ∓V l ∓V m
Number of cycles 10 30 100
V sc,y,seis and ϕ are tabulated in ESR-3520 Table 8-5
ϕ V sc,y,seis ≥ V aua
Nominal shear steel strength of a single anchor for seismic
design
V sa,y,seis , and ϕ are tabulated in ESR-3520 Table 8-5
ϕ V sa,y,seis ≥ N aua
Nominal shear strength of a channel bolt for seismic design and
Nominal flexural strength of the channel bolt for seismic design
V ss,seis , M ss,seis and ϕ are tabulated in ESR-3520 Table 8-11
ϕ V ss,y,seis ≥ V bua
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
199
12
Perform the tests on anchor channels with two anchors
embedded in concrete. The frequency of loading shall be
between 0.1 and 2 Hz. To reduce the potential for uncontrolled
slip during reversal, the alternating shear loading shall be
permitted to be approximated by the application of two half-
sinusoidal load cycles at the desired frequency connected by a
reduced-speed, ramped load as shown in figure 7.8. The edge
distance shall be large enough to avoid an edge influenced
failure.
Nominal shear steel strength of connection between anchor and
channel for seismic design
f c
V sa,y,seis and ϕ are tabulated in ESR-3520 Table 8-5
ϕ V sa,y,seis ≥ V aua
Test description
Seismic shear perpendicular to the channel profile
Seismic Loading (SDC C, D, E and F)
Test Ref
Nominal shear steel strength of a single anchor for seismic
design
All anchor channels systems in a test series shall complete
the simulated seismic-shear loads. Test No. 13 is performed
to extract seismic strength values for the various failures listed
below.
AC232 Table 4.2 — Optional test program for anchor channels for use in uncracked and cracked concete for shear
loading in longitudinal channel axis and for siesmic loading (SDS C, D, E and F)
Test no.
f . f seismic N cb ³ N aua
According to section ACI 318-14 section17.2.3.4.4 0.75ϕN pn for a
single anchor, or for the most highly stressed individual anchor
in a group of anchors. ϕ seis is 0.75.
198
Figure 7.5.4.3— Permitted approximation of seismic shear cycle (Figure
Table 7.1-a — Required load history for simulated seismic
tension test
f . f seismic N sb ³ N aua
Figure 7.6.4.1 — Required load history for simulated seismic tension test
Nominal tensile steel strength of connection between anchor
and channel for seismic design
f . f seismic N pn ³ N aua
ϕ N sa,seis ≥ N aua
N sa,seis , and ϕ are tabulated in Table ESR-3520 Table 8-3
Nominal bending strength of the anchor channel for seismic
design HBC-C-N and HBC-T
M s,flex,seis and ϕ are tabulated in Table ESR-3520 Table 8-3
All anchor channels systems in a test series shall complete
the simulated seismic-tension load history. Subject the anchor
channel to the sinusoidal tension loads with a cycling frequency
between 0.1 and 2 Hz. All anchor channels systems in a test
series shall complete the simulated seismic-tension load history
specified. Failure of an anchor channel system to develop the
required tension resistance in any cycle before completing
the loading history shall be recorded as a failure of an anchor
channel system to develop the required tension resistance in
any cycle before completing the loading history. Test No. 12 is
performed to extract seismic strength values for various failure
listed above.
7. Anchor Channel
Design Code
7.6.5 A
NALYSIS IN SCD A OR AND SDC C, D, E
OR F
4. Design
Introduction