allowable deflection in lifting beams

Question

allowable deflection in lifting beams

weron4u (Structural)

(OP)

18 Jun 04 10:14

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 (Materials) · Answer 1 · 2004-06-18 17:38:25

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.

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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

unclesyd (Materials) · Answer 2 · 2004-06-18 22:12:23

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 (Materials) · Answer 3 · 2004-06-21 10:52:09

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)

www.ccb.org/docs/ufgshome/pdf/14535N.pdf
(see section 2.2)

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allowable deflection in lifting beams