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Re: Curved Stair Stringer

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It is 2 parallel stringers with the same center of radius at each of the
curves.

Rich

On Thu, 25 Sep 2003 10:01:31 -0400 "Vlad Cernescu"
<vcernescu(--nospam--at)banerjee.com> writes:
> Is it a one stringer or two parallel stringers?
> 
> Regards,
> 
> Vlad
> vcernescu(--nospam--at)banerjee.com
> 
> ----- Original Message ----- 
> From: "richard lewis" <rlewistx(--nospam--at)juno.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Thursday, September 25, 2003 9:46 AM
> Subject: Curved Stair Stringer
> 
> 
> > I looking for some tips for modeling a curved beam. I have an 
> circular
> > custom stair. It is supported at the 1st floor (slab on ground) 
> and 2nd
> > floor. It looks something like a slotted hole in plan. From the 
> first
> > floor it does a 1/4 turn. Then there is a straight run, then 
> another 1/4
> > turn back to the 2nd floor. I am supporting it with a tube at the 
> second
> > floor and anchoring it to the slab at the first floor. The tube 
> will give
> > me torsional resistance. The tube is about 16 ft. long and spans 
> to 2
> > perpendicular beams, one at each end. The beams then span to 
> columns
> > buried in the wall. Looking at this in plan view the 2nd floor 
> beams
> > would form an 'H' shape. 
> > I want to get feedback for modeling the stringers in a computer 
> frame
> > analysis. I guess my first impulse is to use short chord elements 
> to
> > simulate a curved member. I started doing this with 15 degree 
> angles for
> > the chords.  I would then uniformly load these members and have a 
> fixed
> > joint at the tube column at the 2nd floor. I guess the connection 
> to the
> > floor slab at the first floor would be pinned.  I would use a 
> moment
> > frame from the vertical legs of the 'H' shape to give me lateral
> > stability. Any other suggestions for modeling this?
> > I am wondering what would be the best section for a stringer.  
> Since it
> > is a curved member it will have torsion.  Should I be using a 
> closed
> > section like a tube?  A tube might be hard to bend on the radius.  
> Should
> > I make a closed section from welded curved plates?  Should I just 
> use a
> > single thick plate for a stringer?
> > Thanks for your help.
> > 
> > Rich
> > 
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