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Load analysis of gantry crane on caster wheels

Load analysis of gantry crane on caster wheels

Load analysis of gantry crane on caster wheels

(OP)
We have a gantry crane that rest on caster wheels, so that each of the legs supporting the gantry are free to slide in any direction, rather then run on a track.   I've been ask to estimate a safe working load for the crane.  We will proof test to this load to 125% before putting it into commercial use.

I have safe working loads from the upper gantry beam from the steel suppliers manual.  The trucks, hoist, rigging and caster wheels are all rated by the manufacturer.

Whats the best practice for determining the working loads on the legs and the joint between gantry and legs?  How do I determine bending moment at the joint?  My inclination is to use the reaction at the wheel, height of the unloaded gantry and deflection angle of the gantry beam under load.

M=R*HcosA

How much lateral deflection of the legs can be allowed before they need to be considered a canteliver beam instead of a collumn?

Anyone know where to find good worked examples?

Thanks,
Eric

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