This probably isn't a simple problem. Is this a SCBF? If so, strengthening the brace will mean recalculating many of the other members (columns, beams and braces). The same may be true of other lateral force resisting systems.
MJ
--- On Mon, 8/10/09, Glenn Otto <ggator1256@cox.net> wrote:
> From: Glenn Otto <ggator1256@cox.net>
> Subject: RE: A53 pipe substitution for HSS pipe brace
> To: seaint@seaint.org
> Date: Monday, August 10, 2009, 7:11 PM
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> Drew,
>
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> I don't
> know what members are doing what and what the symmetry
> problem is, but is it
> possible in your case to calculate what stresses the
> eccentricity(?) introduce
> to the members and sum those with the intended
> ones?
>
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>
>
> A
> Structural Engineer, P.C.
>
> Glenn C. Otto, P.E.
>
> Virginia Beach, VA
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>
> -----Original
> Message-----
>
> From: Drew
> Morris
> [mailto:dmorris@bbfm.com]
>
> Sent: Monday,
> August 10, 2009 9:47
> PM
>
> To: SEAINT
>
> Subject: A53
> pipe substitution for
> HSS pipe brace
>
>
>
> I have a case
> where
> a HSS5.00x0.250 round brace was cut 12" too
> short. The
> contractor/fabricator cannot apparently find another piece
> that is easily
> available. The piece is only about 14 feet long and
> is part of a 2-story
> X braced bay. They have asked whether they can use a
> piece of 5" STD
> A53 pipe instead. For the HSS, RyFyAg = 205.2
> k. For the A53,
> RyFyAg = 292.3k. I can increase the throat of weld of
> the brace to the
> gusset plate, but I'll end up with a non-symmetrical
> brace configuration.
> Any comments or suggestions?
>
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>
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