Impact factor for Gantry

[ToadJones]

Anyone have any clue what is used for an impact factor on outdoor gantry crane wheel loads?

 

[MiketheEngineer]

This has been discussed many times - but I think it is 1.5 or 2. Check your local code book.

 

[ToadJones]

I'm not having much luck Mike.
Any of the major codes have provisions for this?

 

[hokie66]

Why wouldn't the impact factor be the same as for an indoor crane?

 

[ToadJones]

I was just pointing out that it was an outdoor gantry.
I have worked with cranes a fair amount but to this point, I have never had to design and supporting structures for a gantry.

 

[boo1]

The outside gantry crane we use has a wheel load impact allowance of 15 percent, added to the static loads. (I assume it's dependent on CMAA Class Service)

 

[MiketheEngineer]

IBC 2009 1607.8.2 says 100% for elevators, 50% for power driven units

I would probably use 100% - steel is cheap!

 

[CTW]

I'd say treat it the same as an overhead crane and use the impact factor for cab, pendant or remote operated.