Beam Flange Deflection under Eccentric Loading
Beam Flange Deflection under Eccentric Loading
(OP)
Hi all,
I've been asked a tricky question I'd like a couple of second opinions on before I answer regarding a beam loading case.
A heavy item of equipment in a box frame is seated on beams which run along its two opposite sides, but the beams will be set out wider than the box frame such that the load will pass through the box frame and onto a point about two thirds of the flange width away from the web of the beams.
So I was thinking to treat the flange as a plate restrained where it meets the web of the beam and do a quick minor axis bending check on that plate but I'm reasonably sure the flange of a beam will be stronger than this simplification will result.
How would you approach this problem? Any clearer ideas, or would you all take the simplified approach I was thinking?
Looking forward to hearing people's opinions - like they say, ask ten engineers & get ten different solutions.
I've been asked a tricky question I'd like a couple of second opinions on before I answer regarding a beam loading case.
A heavy item of equipment in a box frame is seated on beams which run along its two opposite sides, but the beams will be set out wider than the box frame such that the load will pass through the box frame and onto a point about two thirds of the flange width away from the web of the beams.
So I was thinking to treat the flange as a plate restrained where it meets the web of the beam and do a quick minor axis bending check on that plate but I'm reasonably sure the flange of a beam will be stronger than this simplification will result.
How would you approach this problem? Any clearer ideas, or would you all take the simplified approach I was thinking?
Looking forward to hearing people's opinions - like they say, ask ten engineers & get ten different solutions.






RE: Beam Flange Deflection under Eccentric Loading
Don't forget about global beam bending/deflection if you are interested in total deflection. There will also be torsion. This rotation will cause additional deflection on the tip of the flange.
RE: Beam Flange Deflection under Eccentric Loading
RE: Beam Flange Deflection under Eccentric Loading
And an old CMAA sample calc for cranes: Link
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Beam Flange Deflection under Eccentric Loading
Thaidavid
RE: Beam Flange Deflection under Eccentric Loading
Mike McCann, PE, SE (WA)