All values in the above tables assume
that each column carries half of the frame load. The table values are expressed
in pounds per frame. These values are based on gravity loading only that is
purely axial. Any condition where the axial load is accompanied by moment,
the axial load capacity will be less. This will occur for non-symmetrical
loading conditions. The capacities also assume that the base plates and the
bracing are of adequate strength and that all other parts of the rack have been
properly designed. All values are for undamaged racks that are installed plumb.
It is the rack user’s responsibility to properly maintain the racks to ensure
that the carrying capacity of the racks is not reduced by damage and that any changes
to the rack configuration do not cause an unsafe condition.
Frame capacities are based on the unsupported length, which is
the measurement of the distance between the floor and the top of the first beam
or the maximum spacing between beams, whichever governs.
Capacities do not take seismic, wind or other lateral forces into
consideration.
Upright frames have to be anchored with at least one anchor bolt
in each post and require a minimum concrete floor strength of 3,000 PSI for the
maximum loads.
Contact the Unarco Springfield Office for any of the following
conditions:
Any application
where the frame load exceeds 31,000 lbs. These frames may need larger base
plates or heavier bracing.
Any application
that requires seismic design where the design ground acceleration Ss exceeds 25%g
in IBC areas.
Configurations
that require a frame deeper than 60 inches or higher than 40 feet.
Applications
that involve support platforms or catwalks or any application other than normal
pallet rack.
Any single
row where the height-to-depth ratio exceeds 6 to 1. These must be checked
for anchorage against overturning.
Any condition
which creates uncertainty as to the proper use of these tables.
Column protection is recommended for uprights subjected to potential
column abuse from lift trucks.
Rack
