helical stair design

huangyhg

helical stair design
could anybody suggest to get some information on the design of helical type stair (supports at top and bottom only)? what's the concept, theory involved in designing such stair?
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sunnyshine
you will find an excellent article on helical stairs in beton kalender 1954 part 2, page 185, if you can read german. later reprints may be available. suggest you contact the publisher on
sunnyshine
you can refer to "reinforced concrete designer's hand book" by chrles e reynolds(table 176, p-448, ix edition, cement and concrete association, wexham springs, slough)
chandra
thank you for your valuable suggession.  could you please suggest a web site related to this?
here are some sites that might help you.
don leffingwell