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RE: Helical Steel Stairs Question

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: Helical Steel Stairs Question
• From: "Himat Solanki" <hsolanki(--nospam--at)co.sarasota.fl.us>
• Date: Thu, 03 Oct 2002 15:33:07 -0400

```It is unclear about helical stairs. Are you  looking for a helical stair without column, i.e floor to floor support ? If it is, please look for a paper in the AISC Engineering Journal " Analysis of Helicoidal Girders" by A. Abdul Baki and Dean Bartel. If it is not the case look at the NAAMM web page for steel stairs.
Himat  Solanki

>>> nblackburn(--nospam--at)fdgoak.com 10/03/02 07:25AM >>>
I used to build wood helical stairs in a former life and that is exactly
what we did (in solid or hand-laminated wood), only without calcs etc.  What
are your inside(if other than a central post) and outside radii?  If you
aren't building off a central post, are you wrapping around an architectural
feature that would allow you to use it as a central "post" to cantilever
from?

Nick Blackburn, PE
-----Original Message-----
Sent: Thursday, October 03, 2002 7:54 PM
To: seaint(--nospam--at)seaint.org
Subject: Helical Steel Stairs Question

I'd cantilever the stairs off a stout central pipe column and consider the
helices as providing minor load sharing and lateral bracing at the ends of
the steps.

TKDA
Saint Paul, Minnesota

William Grizzell, P.E. wrote:

I've been asked to provide a design for a residential steel stair that ha=
s a double helix twisted shape, approx. 10 ft. high and has a 180 degree =
radius.  I plan on using cold rolled 12" channel for the stringers with w=
elded z-shaped plates for steps.  The stairs will be wrapped in wood.  An=
y suggestions on how to calculate this or other recommendations are much =
appreciated.

William Grizzell, P.E.

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