Document number: ED. 03622.00.001.R04.ENG
Page 45 of 151
ED.02518.00.001.R08.ENG
Page 45
The effect of eccentricity of the Centre of Gravity on the capacity of the System
When the Centre of Gravity (COG) is not in the centre of the System, the capacity of the
System will decrease. The figures below give the principle of it. The numbers are fictitious.
Assume:
x
a
load
of
1000
kN
x
a bearing capacity per unit of 250 kN
x
stage
2
used
Centre of Gravity in the centre
Centre of Gravity eccentric
The load is spread
equally
over the units:
All Units bear 1000 / 4 = 250 kN
The load is spread
unequally
over the units.
The load on the ‘
green unit has increased
significantly and exceeds 250 kN
The system is loaded to its limits, but none of
the units is overloaded.
The
green
unit is
overloaded
!
The system cannot lift the 1000 kN anymore
but less, to prevent overload in the green unit.
The capacity of the system has decreased
due to eccentricity of the load.
)
The more the COG of the load deviates from the centre of the System, the less
the capacity will be.
The capacity charts on the next pages show the bearing capacity of the system in relation to
the position of the load. The
co
lo
ur
ed
cells in that
capacity chart
correspond with the
u
n
i
ts
in the figure above.
Use the capacity chart as follows for your
side
shift operations
:
x
Locate
the
position
of the COG in the
capacity chart, as shown at the right
Æ
x
The data on that spot shows the total
capacity (4 units) of the system.
COG
COG
COG
Summary of Contents for SBL1100
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