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Re: HSS thin gage section properties

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In Part III of the AISI Cold Form Specification, Section 1 - Linear Method for Computing Properties of Formed Sections, one can find the properties of line elements and circular line elements. Being that you have closed sections (tubes), one spread sheet can probably provide you with the section properties. This is the Supplementary Information for the Spec. Depending upon your section, you also have to determine the effective widths of the various elements.

There is actually a catalog/manual for AISI tubes with the section properties, but I haven't been able to find it. As you have found out, these sections are really AISI sections and not AISC sections. You may want to be careful with the steel as it may be 1018 or 1020. Check whether it is hot rolled or tcold rolled. Recently I was able to obtain some mill certs on some round tubing and bent sections and was surprised at the good strengths available. Problem with that was how does one model a bend tube over a mandrel when portions of the tubing are squashed?


On 1/29/2014 7:41 AM, Paul Ransom wrote:
CFS by RSG Software will handle closed sections per AISI-S100-12 North
American Specification for the Design of Cold-Formed Steel Structural
Members. The free version will handle limited elements. If the section is
cold formed and seam welded, you can take the benefit from the
pseudo-increase in E. Otherwise, tell it to ignore the cold-work effects.

Minimum radius for cold forming of most ASTM structural sheet products is
2t. For most small radius you can ignore it or guesstimate radius and get
very reasonable estimates.

Paul Ransom, P.Eng.


Date: Tue, 28 Jan 2014 23:47:36 +0000
From: Matthew Stuart<MStuart(--nospam--at)>
Subject: RE: HSS thin gage section properties

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