A simple statics question
A simple statics question
(OP)
I would like your opinion on the following:
Consider 2 ft. long outrigger 3x3 angles @ 24” centers.
One end of the outriggers is fixed and the other end is free.
At the free end of all outriggers there is a continuous Unistrut channel supporting a moving track with a hung load of 2 Kips say.
Assume the capacity of each outrigger is only 1 Kip.
As the load moves directly under each outrigger tip, does failure occur in the outrigger or does some of the load distribute to the adjacent outriggers because of the continuous beam action of the Unistrut?
Thanks in advance for your comments.
DK
Consider 2 ft. long outrigger 3x3 angles @ 24” centers.
One end of the outriggers is fixed and the other end is free.
At the free end of all outriggers there is a continuous Unistrut channel supporting a moving track with a hung load of 2 Kips say.
Assume the capacity of each outrigger is only 1 Kip.
As the load moves directly under each outrigger tip, does failure occur in the outrigger or does some of the load distribute to the adjacent outriggers because of the continuous beam action of the Unistrut?
Thanks in advance for your comments.
DK






RE: A simple statics question
if you want to do some sums on this, assume a reaction in the central angle. as a cantilever the angle will deflect so much. now based on the original load assumption, the remainder of the load is reacted by the adjacent angles, causing the unistrut to deflect (as a beam, assume simply supported). compare the two deflections to see how close they are, how good is the original load distribution ?
RE: A simple statics question
You can make an estimate by the formulae of beams on elastic foundations.
prex
http://www.xcalcs.com
Online tools for structural design
RE: A simple statics question
RE: A simple statics question
RE: A simple statics question
The other option is to design the angles for 2 kips of load each and forget about it.
RE: A simple statics question
prex, thanks for the link to xcalcs - good stuff on there.
Daria