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Re: ST-Light Gage Tube Design

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Michael D Zaitz wrote:

> Hey,
> Has anyone done any design with Cold-Formed Light Gage Tubes.  The AISI
> specification has criteria for the maximum unbraced length of a box
> section in section D3.3 which states that "the ratio of the laterally
> unsupported length to the distance between the webs of the section shall
> not exceed 0.086E/Fy."  Now for my condition (a shed in Florida), this
> gives a length of almost 94".  However, I can not find any guidance on if
> my braced length is larger than 94".  Section C3.1.2 deals with lateral
> buckling strength however, it has a footnote stating that the equations
> in this section do not apply to "closed box-type members".  Then to make
> it even more difficult the section that deals with having the tension
> flange fastened to sheathing (C3.1.3) does not address box-type members.
>  Does anyone have any guidance? Or know of any good reference material?
> I have "Cold-Formed Steel Design" by Wei-Wen Yu but it does not address
> this.
> Thanks in advance.
> Mike

       Use computer programs is very diffecult to do by hand
     Call this company  SURE TIE INC.  ask for Greg
(714)832-4513    ask for light gage metal computer program is
a lot easier than gong through tese equations

 Dave Anderson P.E.