Adjacent cranes

[Andrewstructure]

I have 2 cranes, running parallel; which are both loading the same steel truss.

Do I have to use the maximum loads from both cranes to design the truss or can I reduce the load somehow?

 

[csd72]

You need to find out what the minimum separation is between the two and base your calculations on that. usually it is mechanicallly limited so they can only travel to within a certain distance of each other.

I would not take accidental loads from the two simultaneously just their working loads.

 

[Ron]

If they can both operate at the same time, then use both loads, keeping in mind that simultaneous load conditions with the cranes at different locations need to be checked as well.

 

[Andrewstructure]

So, no reduction in the vertical loading than. I have to take the max lifted loads for both cranes at the controlling locations.

 

[SlideRuleEra]

In the USA you may need to check load on the truss for the OSHA required crane test load (normally 125% of rated load). Of course this test could be performed on the cranes one at a time. Considering your other requirements for parallel cranes this is likely not a problem... but would be prudent to consider it.

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[vaquers]

I would design the truss for the maximum loads, and establish a minimum separation between the cranes. Actually I did that for verification of an existing concrete crane beam. Regards,

Sebastian