1. Anchor
Channel Systems
Code
2. HAC
Portfolio
3. HAC
Applications
4. Design
Introduction
Discussion
5. Base material
Calculations
8. Reinforcing
Bar Anchorage
9. Special Anchor
Channel Design
10. Design
Software
11. Best
Practices
12. Instructions
for Use
Discussion
13. Field Fixes
14. Design
Example
Calculations
Step 7: Concrete strength
Concrete breakout strength in perpendicular shear for anchor element #3 continued...
ESR-3520 section
4.1.3.3.3
ACI 318-14 Chapter 17
Calculate the modification factor for member thickness (ψ h,V,3 ).
c a1 is measured perpendicular to the anchor channel longitudinal axis, and is
considered when calculating the basic concrete breakout strength in shear (V b ) and
the modification factor for member thickness (ψ h,V ).
h
7. Anchor Channel
Design Code
Code
Step 7: Concrete strength
ESR-3520 Section
4.1.3.3.4.
ACI 318-14 Chapter 17
6. Loading
cr, V
= 2c a1 + 2h
ESR-3520 Equation (38)
ch
h ch … height of anchor channel
b 1 ... Given in ICC-ESR alternatively a default value of 0.50 shall be used
h ch … critical member thickness,
y h, V
æ h
= ç ç
è h cr, V
ö
÷
÷
ø
b 1
Concrete edge breakout: ФV cb,y
h cr,V = 2 (5.00 in) + 2 (1.22 in)
h cr,V = 12.44
if h < h cr,V
ESR-3520 Equation (37)
y h, V
Note: if cracked concrete conditions are assumed, and supplementary edge
reinforcement as defined in ESR-3520 Section 4.1.3.3.3 is used, ψ c,V,3 can be increased
to either ψ c,V,3 = 1.2 or ψ c,V,3 = 1.4.
Cracked concrete
No supplementary reinforcement
ψ c,V = 1.0
With supplementary reinforcement
• Cracked concrete with edge reinforcement (#4 min.)
Concrete edge breakout: ФV cb,y
If uncracked concrete conditions are assumed,
ψ c,V,3 = 1.4.
æ 6in ö
÷
è 12.44in ø
= 0 . 694 £ 1.0
y h, V = ç
£ 1.0
0 . 5
Concrete breakout strength in perpendicular shear for anchor element #3 continued...
Calculate the modification factor for cracked/uncracked concrete (ψ c,V,3 ).
Cracked concrete conditions with no supplementary reinforcement → ψ c,V,3 = 1.0
\ y h, V = 0 . 694
ψ c,V = 1.2
• Cracked concrete with edge reinforcement (#4 min.) and stirrups (#4 min.) spaced
at 4” O.C.
ψ c,V = 1.4
Uncracked Concrete
Anchor channels located in a region of a concrete member where analysis indicates
no cracking at service load levels.
ψ c,V = 1.4
Note: in order to activate the reinforcement, concrete has to crack. Therefore, if
uncracked concrete is assumed, supplementary reinforcement does not impact this
factor.
Concrete is typically assumed to be cracked under normal service load conditions.
If cracked concrete conditions are assumed, an increase in V cb,y is permitted via the
modification factor ψ c,V if supplementary edge reinforcement is used. If uncracked
concrete conditions are assumed, an increase in V cb,y is likewise permitted via the
modification factor ψ c,V . Reference ESR-3520 Section 4.1.3.3.3 for more information.
Figure 14.1.24 — Design example – height reduction factor h cr,v
408
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
409