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RE: Steel HSS Compression Analysis

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Can you use the AISC provisions for a non AISC shape like this? If so, then at what point do you have to start using AISI? That is where I would have started.

 

Will


From:  "David Maynard" <davemaynard(--nospam--at)ceincorp.com>
Reply-To:  <seaint(--nospam--at)seaint.org>
To:  <seaint(--nospam--at)seaint.org>
Subject:  Steel HSS Compression Analysis
Date:  Wed, 17 Aug 2005 13:38:36 -0600
>Here's what I got.  I have a tube shape, 2" wide by 4" deep by 14 ga.
>(0.0747" thick).  I'm using LRFD 3rd Ed. Nov. 10, 2000 HSS Design
>Specification found within.  I check my Slenderness Limits as described in
>Table 2.2-1.  Assuming, because this is not an AISC shape, that Fy = 33 ksi,
>I found Lambda r to be 41.5.  My controlling wall slenderness ration, h/t,
>lambda is 50.5, which exceeds the lambda r.
>
>Flipping to section 4.2 of this design spec, I see that if lambda is greater
>than lambda r, for rectangular HSS, Q = effective area/Ag.  It then states
>that the effective area is equal to the summartion of the effective areas of
>the sides using be = <long equation>.
>
>The question that I run into is, what does this mean, "effective area"???
>
>Do I have to use this equation for both wall dimensions, first with b and
>then with h???  Or do I just use this equation as a substitute for b and
>leave h untouched, even though that is the controlling slenderness limit???
>
>And once this question is answered, I'm assuming I just take these adjusted
>dimensions, multiply them by the thickness and combine all four side for an
>effective area.
>
>Right now, and I'm not sure if this is my illness/vacation talking but, this
>just doesn't make any sense to me.  Can someone shed some light on the
>situation???
>
>Sincerely,
>David Maynard, PE
>Gillette, Wyoming
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>
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