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Unarco designs conform to the latest Rack Manufacturers Institute
(RMI) specifications and American Iron & Steel Institute (AISI) Cold Formed
Steel Design Manual using "Load and Resistance Factor Design" (LRFD) method.
Frame capacities are based on maximum 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. Contact the Springfield Office for the following
conditions:
a.) Any application where the frame load exceeds 31,000 pounds.
These situations may need heavier than standard frame bracing.
b.) Any application that requires seismic design where the ground
acceleration is greater than 0.05g or if Ss exceeds 25%g in IBC areas.
c.) Configurations that require a frame deeper than 60" or
taller than 480".
d.) Applications that involve support of platforms or catwalks
or any application other than standard pallet rack.
e.) Single bays of rack.
f.) Any condition which creates uncertainty as to the proper use
of these tables. Table values are column capacities based on gravity loading only.
The table values are based on the assumption that the rack bracing is adequate (none
of the above conditions apply), and all other aspects of the rack have been properly
designed. All values are for undamaged racks.
All values in these 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 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
changes to the rack configuration do not cause unsafe conditions.
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