1. Anchor
Channel Systems
Code
2. HAC
Portfolio
3. HAC
Applications
Discussion
4. Design
Introduction
5. Base material
Calculations
The highest loaded anchor element in tension
does not always control the anchor channel
design in tension. The highest utilization, defined
by the parameter (N ua,total / φN n ) controls the
design. Therefore, the tension design strengths
must be calculated for each anchor element and
checked against the total factored tension load
acting on that element. The most unfavorably
loaded anchor element (highest utilization)
controls the design in tension.
The tension forces acting on each anchor
element can be determined assuming a triangular
force distribution.
The triangular force distribution assumes the
tension force acting on each T-bolt (850 lb) has an
influence on each of the anchor elements within a
given distance (ℓ in) from the T-bolt.
The resulting tension force on each anchor
element (N 1, uax ) from the tension 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.
7. Anchor Channel
Design Code
8. Reinforcing
Bar Anchorage
Code
Step 3: Determination of worst tolerance
ESR-3520
4.1.2.2
Eq (2)
Eq (1)
6. Loading
9. Special Anchor
Channel Design
10. Design
Software
Discussion
11. Best
Practices
12. Instructions
for Use
13. Field Fixes
14. Design
Example
Calculations
Step 3: Determination of worst tolerance
A 1,1
=
(10.56 in - 5.906 in +0.1 in)
A 1,1 = 0.45
= 1
A 1,2
(10.56 in-0.1 in)
1
10.56 in
10.56 in
A 1,2 = 0.9905
A 1,3
(10.56 in – 0.1 in - 5.906 in)
A 1,3 = 0.431
k 1 =
1
=
10.56 in
1
A 1,1 + A 1,2 + A 1,3
N ua1,1 = (k 1 )(A 1,1 )(850 lb)
N ua1,1 = 204.4 lbs
N ua1,2 = (k 1 )(A 1,2 )(850 lb)
N ua1,2 = 449.8lbs
N ua1,3 = (k 1 )(A 1,3 )(850 lb)
N ua1,3 = 195.8 lbs
k 1 = 0.5342
ESR-3520
4.1.2.2
Eq (2)
Eq (1)
The highest loaded anchor element in tension
does not always control the anchor channel
design in tension. The highest utilization, defined
by the parameter (N ua,total / φ Nn ) controls the
design. Therefore, the tension design strengths
must be calculated for each anchor element and
checked against the total factored tension load
acting on that element. The most unfavorably
loaded anchor element (highest utilization)
controls the design in tension.
The tension forces acting on each anchor
element can be determined assuming a triangular
force distribution.
The triangular force distribution assumes the
tension force acting on each T-bolt (850 lb) has an
influence on each of the anchor elements within a
given distance (ℓ in) from the T-bolt.
The resulting tension force on each anchor
element (N 2, uax ) from the tension 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
ℓ in from the T-bolt.
Check:
A 2,1
=
1
0 in
A 2,1 = 0
10.56 in
A 2,2
=
1
10.56 in
(10.56 in - 5.906 in)
A 2,2 = 0.441
A 2,3
=
(10.56 in)
1
10.56 in
A 2,3 = 1
k 1 =
1
A 2,1 + A 2,2 + A 2,3
k 1 =0.6941
N ua2,1 = (k 1 )(A 2,1 )(850 lb)
N ua2,1 = 0 lbs
N ua2,2 = (k 1 )(A 2,2 )(850 lb)
N ua2,2 = 260 lbs
N ua2,3 = (k 1 )(A 2,3 )(850 lb)
N ua2,3 = 590 lbs
Check:
N ua1,1 + N ua1,2 + N ua1,3 =850lbs
N ua2,1 + N ua2,2 + N ua2,3 =850lbs
OK
OK
Figure 14.1.12 — Design example – effect of t-bolt 1 on anchors
Figure 14.1.13 — Design example – effect of t-bolt 2 on anchors
386
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
387