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Re: torsion in stair girder

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What if the stair hangers are connected to the bottom
flange of the girder, and what if the girder is a
W12x19 and the hanger is offset 18" from the W12 and
the load in the hanger is 5k?

I'm not saying these are the conditions Mark has on
his framing plan, but I have seen problems resulting
from eccentric stair hangers in the past.


--- Andrew Kester <akester(--nospam--at)> wrote:

> Mark:
> If this is a composite slab, then you can easily say
> that the slab is bracing the top of the beam and any
> torsion is resisted by the slab- headed stud
> interaction. I am sure the same can be said of the
> metal deck in non-comp, it will brace the top
> flange. On top of that, whether you want it to or
> not, the stair stringers themselves will resist any
> torsion in the beam. This is as redundant as it
> gets.
> Nobody that I know designs for torsion in this
> instance, nor do I see any need to do so. Convincing
> the plan checker is another issue...
> Regards,
> Andrew Kester, PE
> Longwood, FL

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