Crane load in a foundation drawing

[GalileoG]

When tabulating foundation loads, do you put the specified loads for a crane under self weight only or do you include impact factors (not to be confused with load factors) as well?

 

[hokie66]

Crane impact should not affect the footing gravity loads. Lateral loading would have an affect on the column bases, thus the footings.

 

[SlideRuleEra]

In the USA, OSHA requires that overhead cranes be load tested at "not more than" 125% of rated capacity (or higher if specified by the manufacturer).

I suggest that the tabulated load include this 125% of rated capacity. Part of the reason for the careful overload test (hopefully essentially static) is to allow for vertical "impact" loads if a careless operator "yanked" on a heavy lift or did something else to cause a similar impulse loading.

Here is a link to the OSHA section on overhead cranes:

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9830

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