HAC_Technical-Guide

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Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
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
Code Discussion Calculations
Step 3: Determination of worst tolerance
ESR-3520
4.1.2.2
Eq (2)
Eq (1)
The total tension force acting on each anchor
element (N
uax,total
) will be the sum of the T-bolt
forces (N
1,uax
+ N
2,uax
) acting on that element.
As a check, the sum of the total tension forces
acting on all of the anchor elements should equal
the sum of the tension forces acting on all of the
T-bolts.
N
ua1,total
= N
ua,1,1
+ N
ua2,1
= 204 lbs
N
ua2,total
= N
ua,1,2
+ N
ua2,2
= 710 lbs
N
ua3,total
= N
ua,1,3
+ N
ua2,3
= 786 lbs
N
ua1,1
= 204.4 lbs
N
ua1,2
= 449.8 lbs
N
ua1,3
= 195.8 lbs
N
ua2,1
= 0 lbs
N
ua2,2
= 260 lbs
N
ua2,3
= 590 lbs
Figure 14.1.14 — Design example – Anchor Tension forces
Code Discussion Calculations
Step 4: Determine the flexural moment (M
u,flex
) acting on the anchor channel.
ESR-3520
4.1.2.2
Eq (2)
Eq (1)
M
u,flex
is a bending moment.
Assume M
u,flex
occurs at the “point of load
application” → M
u,flex
occurs at the location of the
T-bolt.
Assume the channel is a simply supported beam.
850 lbs
5.906 in
5.806 in
F
1
F
2
M
u,flex
5.806 in
20 lbs
ΣF : 850 lbs – F
1
–F
2
= 0
ΣM:
(850 lbs )(5.806 in ) – (F
2
)(5.906 in) = 0
F
2
= 835.61 lbs → F
1
= 14.39 lbs
ΣM: (14.39 lbs)(5.806 in ) – M
u,flex
= 0
M
u,flex
= 83.6 in-lb
Code Discussion Calculations
Step 3: Determine the shear forces acting on each anchor element.
ESR-3520
4.1.2.2
Eq (2)
Eq (1)
The T-bolt #1 shear force (1750 lb) will have an
influence on each anchor element as shown
below. The shear forces on anchor elements
#1, #2 and #3 resulting from this influence will
be defined as V
ua1,1
, V
ua1,2
and V
ua1,3
respectively.
The influence factor A
1, #x
corresponds to the
influence on anchor element #x from T-bolt #1.
The parameter “s” corresponds to the spacing
between each anchor element. The parameter ℓ
in corresponds to the influence length for T-bolt
#1.
The T-bolt #2 shear force (1750 lb) will have an
influence on each anchor element as shown
below. The shear forces on anchor elements
#1, #2 and #3 resulting from this influence will
be defined as V
ua2,1
, V
ua2,2
and V
ua2,3
respectively.
The influence factor A
#x,2
corresponds to the
influence on anchor element #x from T-bolt #2.
The parameter “s” corresponds to the spacing
between each anchor element. The parameter ℓ
in corresponds to the influence length for T-bolt
#2
h
ef
= 4.173 in.
Channel specification Length: 13.8 in., anchor spacing s: 5.906 in.,
projection: 0.984 in., width: b
ch
= 1.650 in., height: h
ch
= 1.220 in.
ℓ
y
= 0.0796 in.
4
s = 5.906 in.
ℓ
in
= 4.93x(0.0796 in.
4
)
0.05
(5.906 in)
0.5
ℓ
in
=10.56 in
Figure 14.1.15 — Design example – Anchor Shear forces