|
|
 |
|
(diagram 1)
One Section of Single Sided Cantilever Rack
with 4 Columns and 3 arm levels
|
|
| A.
Evenly Distributed Loading
back to top |
Loads must be evenly
distributed in order to attain the
capacities listed.
An Uneven loads reduces
the capacity by 50%.
|
 |
(diagram 2)
Floor Anchors must
be used in all base and column
"anchor holes" to
attain capacities.
|
Type of floor anchors
required is determined by slab construction and therefore
must be determined by customer's engineer.
|
|
| B.
Arm Capacities
back to top |
| Cantilever Arm Capacity |
 |
| Cantilever Arm Capacity Chart |
| 48"x4" cantilever arm |
2,000 pounds per arm |
|
|
Each cantilever arm
can support 2,000 pounds*.
In diagram 1, if the load spanned the entire horizontal
length of the cantilever section, the arms could support a load
weighing up to 8,000 pounds. (load supported by 4
arms x 2,000 pounds per arm = 8,000 pounds)
It is necessary to consider
column capacities as well as arm capacities in order to prevent
overloading cantilever rack.
|
|
| C.
Column Capacities
back to top |
| Cantilever Column Capacity |
 |
| Cantilever Column Capacity Chart |
| 12' tall Cantilever Column |
10,200 Pounds per side
(see load distribution info) |
| 16' tall Cantilever Column |
8,800 Pounds per side (see
load distribution info) |
|
|
|
| D.
Column Load Distribution
back to top |
Determine how much weight each column is actually supporting
Load Distribution per column must
be calculated in order to determine how much weight is being supported
by each individual cantilever column. |
 |
|
(diagram 3)
|
| Determine the weight being stored
on each of the 3 columns. |
| Step 1. Divide the total
load weight by the number of columns
supporting the load.
Step 2. Add the weight
of any loads which are only supported by one column. (yellow
loads)
Example:
Column #1 is supporting 1/2 of load a
plus 400 pounds:
Load a = 5000 pounds divided by 2 columns
= 2,500 pounds
add weight of the load which is supported exclusively by
column #1
= 400 pounds
Column #1 is supporting 2,500 pounds + 400 pounds
= 2,900 pounds
Column #2 is supporting 1/2 of load a
plus 1/2 of load b
plus 400 pounds + 200
pounds
Load a = 5000 pounds divided by 2 columns
= 2,500 pounds
Load b = 3,000 pounds divided by 2 columns
= 1,500 pounds
add weight of the load which is supported exclusively by
column #2 : = 400 pounds + 200 pounds
= 600 pounds
Column #2 is supporting 2,500 pounds + 1,500 pounds + 600 pounds
= 4,600 pounds
Column #3 is supporting 1/2 of load b
plus 200 pounds
Load b = 3,000 pounds divided by 2 columns
= 1,500 pounds
add weight of the load which is supported exclusively by
column #3
= 200 pounds
Column #3 is supporting 1,500 pounds 200 pounds =
1,700 pounds
|
Total Weight Stored on Each Column in Example
|
| Column #1 |
Column #2 |
Column #3 |
| 2,900# |
4,600# |
1,700# |
|
Neither of the 3 columns support more than 10,200
pounds per side, therefore the
cantilever in diagram #3 is loaded within the capacity limits.
|
|
|
|
| CANTILEVER COLUMN CAPACITIES ARE STATED
PER SIDE.
|
(see diagram 4)
Example: A 12' tall Middle Cantilever
Column has a capacity of 10,200 pounds if the column is single sided,
and a capacity of 10,200 pounds PER SIDE if
the column is double sided. |
| Single Sided |
Double Sided |
 |
 |
|
(diagram 4)
|
Loads which are stored on the base
(not on the arm) are not
supported by the column.
Therefore, "base loads"
should not
be considered when determining
column capacity.
|
| E.
Determining Maximum Distance Between Columns
back to top |
Distance between columns (bracing size, see diagram 4) should not exceed
a dimension equal to:
Length of the Load
Total # of Columns
|
|
In Diagram 4, the distance between the columns must not exceed:
15 feet (length of the load)
2 columns (# of columns supporting the load)
|
Distance Between Columns may not exceed 7 1/2 feet.
|
 |
|
(diagram 5)
|
|