allowable deflection in lifting beams 1

[weron4u]

I am assigning load limits for various trolley beams in our company, and I was hoping I could get some input on allowable deflections for lifting beams. I have had several sources tell me different things, but nobody gave me a reference to where they got their info.

I am assigning safety factors due to the allowable stress in the beams, however I think that there might be deflection limits that some beams are exceeding before reaching the maximum allowable stress.

I am very familiar with determining the allowable stresses, but not deflections. Are the deflection limits completely subjective to the loading conditions? Any help would be great.

Thanks

 

[EdStainless]

I don't know where the defection limits are. I remember that the last time I did this we ended up using about 1/3 of the allowed defection limits. Otherwise the beams looked like noodles.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[unclesyd]

You might want to take a look at this website for a little guidance. They reference a couple of documents.

http://www.tandemloc.com/index.asp

 

[metengr]

In addition to the above; here are two additional web sites that have info on recommended beam deflections;

http://www.bridge-cranes.com/cranes.htm

(see the crane specification)

http://www.ccb.org/docs/ufgshome/pdf/14535N.pdf

(see section 2.2)