3.4
Frame and Chassis
3.4.1 Material Quality
Material qualities for specified steel mounting frames:
– Mounting frames
mounted with brackets
(friction-locking) = St W 22 or St 37-2
Mounting frames of high strength steels must have at least
the rigidity of steel mounting frames. The mounts must be
friction-locking.
Aluminum platform superstructures:
– Observe information provided by the aluminum
manufacturer.
– The longitudinal members, plank floor, floor panels
and cross members must form one unibody unit.
3.4.2 Design
The transition of the channel at the front ends of the
longitudinal members should be a gradual one.
If extremely high longitudinal members or an
extremely low overall frame height is required, the U-
channel can be designed as follows for friction-
locking connections
– As a closed box
– Inside overlapping or
– Overlapping
This
increases the moment of resistance but also the
torsional rigidity. Ensure good transition from closed
longitudinal member to open U-channel.
Material Tensile strength
N/mm
2
Breaking strain
N/mm
2
St W 22 > 360 210
St 37-2 > 360 235
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