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Torsion in a simply supported beam

Torsion in a simply supported beam

Torsion in a simply supported beam

(OP)
Hi,


I have a simply supported I-beam, connected by fin plate connection. Will this beam can take torsion.
As per AISC design guide 9 simply supported beam takes torsion. According to me this beam will never take torsion.
Please correct me.

RE: Torsion in a simply supported beam

There will be some torsion - but only to the extent that the single plate connectors can resist. They probably have very little torsional stiffness so there would likely be minimal actual torsion in the beam.

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RE: Torsion in a simply supported beam

The beam can take the torsion.....the ends (likely) can not. I did a study on this some years back: You typically need some type of flange restrained connection (i.e. moment; torsionally "fixed") to transfer a significant amount of torque (unless you have some intermediate/sub framing that won't let it get to the ends).

Basically with clip angle/single plates.....the torsion will go to the connection by bending in the web. The web typically can't take much.

RE: Torsion in a simply supported beam

This is what you would call a torsionally pinned end. Yes, the beam can take some torsion.

RE: Torsion in a simply supported beam

"torsionally pinned" = it doesn't work ?

I think the clips can carry the incidental torsion that arises due to small imperfections, but not any sizable torsion like from a load.

another day in paradise, or is paradise one day closer ?

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