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Re: Helical Steel Stairs Question

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The only pearl of wisdom that I can add that I have not seen in the other responses is that the stringer reactions in this configuration will each have six components.  That is, each end of each stringer will transmit Fx, Fy, Fz, Mx, My and Mz to the supporting structure.  When I have dealt with these stairs in the past, they were premanufactured so the supplier supplied those loads to me.  I  did not calculate them.  I just know my structure had to handle them. 
Jeff Coronado, S.E.
West Covina, CA
----- Original Message -----
Sent: Wednesday, October 02, 2002 2:07 PM
Subject: Helical Steel Stairs Question

I've been asked to provide a design for a residential steel stair that has 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 welded z-shaped plates for steps.  The stairs will be wrapped in wood.  Any suggestions on how to calculate this or other recommendations are much appreciated.

William Grizzell, P.E.
Consulting Engineer - Structural
2278 Camino Ramon, Suite 12
San Ramon, CA
Phone: 925-866-1171
Fax: 925-866-1121

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