cantilevered beam deflection limits vs. simple span beam
cantilevered beam deflection limits vs. simple span beam
(OP)
G'day people.
Random question: why is the deflection limit for cantilevered beams typically twice that for a simple spanning beam?
For example, deflection limit for a simple spanning beam would be say L/400 and for a cantilevered condition it would be 2L/400 (L/200). Why would the cantilevered condition be more relaxed? I would think humans would more easily perceive a change in floor elevation over shorter distances, so I would think it would be more stringent for cantilevered case.
I've been using the "2L" rule for setting cantilevered beam deflections, just never understood why -maybe the community can help.
Any insight would be much appreciated!
Cheers
Random question: why is the deflection limit for cantilevered beams typically twice that for a simple spanning beam?
For example, deflection limit for a simple spanning beam would be say L/400 and for a cantilevered condition it would be 2L/400 (L/200). Why would the cantilevered condition be more relaxed? I would think humans would more easily perceive a change in floor elevation over shorter distances, so I would think it would be more stringent for cantilevered case.
I've been using the "2L" rule for setting cantilevered beam deflections, just never understood why -maybe the community can help.
Any insight would be much appreciated!
Cheers






RE: cantilevered beam deflection limits vs. simple span beam
wonder if the convicts will beat out the darkness for this years' bledisoe ?
Quando Omni Flunkus Moritati
RE: cantilevered beam deflection limits vs. simple span beam
Think of that with simple supports at each end and no wall in the middle.
You have slope and deflection at each end. No slope and no deflection in the middle.
Length of the simple span is two times the cantilever length with the same deflection.
Great question.
-MCW
(KY)
RE: cantilevered beam deflection limits vs. simple span beam
RE: cantilevered beam deflection limits vs. simple span beam
Mike McCann
MMC Engineering
RE: cantilevered beam deflection limits vs. simple span beam