Hoist Beam - Sway Bracing

[slickdeals]

All - I have a electrical vault that is a few feet below street level and need to design a hoist beam to be able to carry 20,000 lb load. Are there any specific requirements as far as designing the hoist beam for torsion and sway bracing? The beam span is about 20' and it supported on a masonry wall on one side and another beam on the opposite end.

 

[JAE]

My first instinct would be to include a lateral load of 20% of the hoist load, perpendicular to the beam (to mimic AISC's recommendation for craneway beams).



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[DaveAtkins]

I disagree with JAE, sort of.

For underhung monorail hoists, I don't think the bridge crane lateral loads apply. You don't have a travelling crane banging back and forth against two parallel crane runway beams.

That being said, I would still put in lateral bracing at each of the hoist beam. Diagonal kickers or something like that.

DaveAtkins

 

[JAE]

Dave - agree with your point.
I was thinking:
a) Have some "standard practice" to base any type of lateral load on, and
b) Sometimes with underhung hoists, the load is pulled or pushed over sideways to put it in place when it is not located directly under the hoist center, imparting a lateral force.



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