Torsion in a simply supported beam

[allimuthug]

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.

 

[JAE]

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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[WARose]

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.

 

[WARose]

Here is a thread where I elaborate further:

http://www.eng-tips.com/viewthread.cfm?qid=427598

 

[slickdeals]

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

 

[rb1957]

"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.

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