HAC_Technical-Guide

390 391
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 Tension forces on to anchor element.
ESR-3520
4.1.2.2
Eq (2)
Eq (1)
The highest loaded anchor element in shear does
not always control the anchor channel design
in shear. The highest utilization, defined by the
parameter (V
ua,total
/ φ
Vn
) controls the design.
Therefore, the shear design strengths must be
calculated for each anchor element and checked
against the total factored shear load acting
on that element. The most unfavorably loaded
anchor element (highest utilization) controls the
design in shear.
The shear forces acting on each anchor element
can be determined assuming a triangular force
distribution.
The triangular force distribution assumes the
shear force acting on each T-bolt (1750 lb) has an
influence on each of the anchor elements within a
given distance (ℓ in) from the T-bolt.
The resulting shear force on each anchor element
(V
1, uax
) from the shear force acting on T-bolt #1
will be proportionate by the factor
(A
1, #x
) to the distance of the anchor element
with respect to the distance ℓ in. Note that the
influence length (ℓ in) does not necessarily
coincide with the channel length.
Even when a T-bolt is located directly over one
anchor element, the T-bolt load is still distributed
to all other anchor elements within the distance
ℓ
in
from the T-bolt.
V
ua1,1
= (k
1
)(A
1,1
)(1750 lb)
V
ua1,1
= 420.86 lbs
V
ua1,2
= (k
1
)(A
1,2
)(1750 lb)
V
ua1,2
= 925.99 lbs
V
ua1,3
= (k
1
)(A
1,3
)(1750 lb)
V
ua1,3
= 403.15 lbs
Check:
V
ua1,1
+ V
ua1,2
+ V
ua1,3
=850lbs
OK
A
1,1
=
1
10.56 in
A
1,2
=
(10.56 in-0.1 in)
1
10.56 in
A
1,1
= 0.45
A
1,2
= 0.9905
A
1,3
=
(10.56 in – 0.1 in - 5.906 in)
1
10.56 in
A
1,3
= 0.431
1
A
1,1
+ A
1,2
+ A
1,3
k
1
=
k
1
= 0.5342
(10.56 in - 5.906 in +0.1 in)
Figure 14.1.16 — Design example – effect of t-bolt 1 on anchors
Code Discussion Calculations
Step 3: Determination of Tension forces on to anchor element.
ESR-3520
4.1.2.2
Eq (2)
Eq (1)
The highest loaded anchor element in shear does
not always control the anchor channel design
in shear. The highest utilization, defined by the
parameter (V
ua,total
/ φ
Vn
) controls the design.
Therefore, the shear design strengths must be
calculated for each anchor element and checked
against the total factored shear load acting
on that element. The most unfavorably loaded
anchor element (highest utilization) controls the
design in shear.
The shear forces acting on each anchor element
can be determined assuming a triangular force
distribution.
The triangular force distribution assumes the
shear force acting on each T-bolt (1750 lb) has an
influence on each of the anchor elements within a
given distance (ℓ in) from the T-bolt.
The resulting shear force on each anchor element
(V
2, uax
) from the shear force acting on T-bolt #1
will be proportionate by the factor
(A
2, #x
) to the distance of the anchor element
with respect to the distance ℓ in. Note that the
influence length (ℓ in) does not necessarily
coincide with the channel length.
Even when a T-bolt is located directly over one
anchor element, the T-bolt load is still distributed
to all other anchor elements within the distance
lin from the T-bolt.
A
2,1
=
0 in
1
10.56 in
A
2,2
=
1
10.56 in
A
2,1
= 0
A
2,2
= 0.441
A
2,3
=
(10.56 in)
1
10.56 in
A
2,3
= 1
1
A
2,1
+ A
2,2
+ A
2,3
k
1
=
k
1
=0.6941
(10.56 in - 5.906 in)
V
ua2,1
= (k
1
)(A
2,1
)(1750 lb)
V
ua2,1
= 0 lbs
V
ua2,2
= (k
1
)(A
2,2
)(1750 lb)
V
ua2,2
= 535.33 lbs
V
ua2,3
= (k
1
)(A
2,3
)(1750 lb)
V
ua2,3
= 1214.67 lbs
Check:
V
ua2,1
+ V
ua2,2
+ V
ua2,3
=1750lbs
OK
Figure 14.1.17 — Design example – effect of t-bolt 2 on anchors