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RE: Curved Steel Beams

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I kept an edition of the AISC Journal that addresses this very issue (March
1993).  They recommend a minimum radius of not less than 10 to 14 times the
depth for the strong axis.  Might be worth a call to a fabricator/roller to
12 feet sounds too small for a W16.

Kent Estes, S.E.

> ----------
> From: 	Tom Castle[SMTP:tcastle(--nospam--at)]
> Sent: 	Wednesday, February 18, 1998 5:09 PM
> To: 	'seaoc(--nospam--at)'
> Subject: 	Curved Steel Beams
> I am working on a structural steel framed roof with a curved "turtle
> shell" surface.  Of course the architect wants the volume ceiling to
> reflect the top side of the roof, so no trick flat beams below.  I have
> a couple options as to how to frame it, but was wondering what the
> practical limits are as to how tight a radius a wide flange beam can be
> curved.  The beam size would be about a W16x26.  I suppose that the beam
> can always be fabricated out of plates, but I if think I want to avoid
> this.  I know how to analyze the beam once it is made, but can it be
> made and are there residual stresses that must be taken into account?
> The radius at some points is as little as 12 feet.  Any thoughts?  It
> would be appreciated.  Thanks.
> Thomas Castle, S.E.