Eccentric Load on Flange of W-Shape
Eccentric Load on Flange of W-Shape
(OP)
I am looking for guidance on the proper way to analyze a beam where the load is supported by the flange, in this case, a hollowcore concrete panel "nested" inside the web, bearing directly on the flange. I recognize the load is eccentric, and will try to make the beam twist. It also seems to me that the flange will act like an unsupported element, subject to bending stress. Am I missing something?
thanks in advance.
the rattler
thanks in advance.
the rattler





RE: Eccentric Load on Flange of W-Shape
an FEA analysis to solve the problem. Do you have acess to
FEA software? I thought about treating the flange of the beam as a cantilevered beam (with flange connection at the web being restrained)to see what kind of stresses I would get?
One problem I see with that is the flange is wide compared to its length so bending theory is probably out the door.
RE: Eccentric Load on Flange of W-Shape
Thanks anyway for your help and interest, I really rely on Eng-Tips, it's been terrific for me.
RE: Eccentric Load on Flange of W-Shape
As for the intellectual question, that looks a little like the loading you get from crane wheels on the bottom flange of a monorail. Those are point loads on the flange, usually out at the tip.
For those, I've used an old printout from CMAA-74 to calculate the bending on the cantilever flange, this in turn must be combined with the bending stresses (major axis bending) on the gross section and combined using the Hencke-Von Mises interaction. For the hollow core slab, it may be uniform loading and the CMAA 74 doesn't directly apply. Maybe Timoshenko or Roarke could get you what you need.
regards,
chichcuk
RE: Eccentric Load on Flange of W-Shape
(Being a UK based engineer, I'm not sure what profile a 'W' section is !!)
Of course this problem only exisits at edge beams because internal beams have pc floors both sides and therfore the resultant of the loads acts through the centroid of the section assuming spans both sides are equal.