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RE: A53 pipe substitution for HSS pipe brace

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Drew,

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(--nospam--at)cox.net> wrote:

> From: Glenn Otto <ggator1256(--nospam--at)cox.net>
> Subject: RE: A53 pipe substitution for HSS pipe brace
> To: seaint(--nospam--at)seaint.org
> Date: Monday, August 10, 2009, 7:11 PM
> 
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> Drew,
> 
> 
>  
> 
> 
> 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? 
> 
>  
> 
> 
> A
> Structural Engineer, P.C. 
> 
> Glenn C. Otto, P.E. 
> 
> Virginia Beach, VA  
> 
>  
> 
> 
> -----Original
> Message-----
> 
> From: Drew
> Morris
> [mailto:dmorris(--nospam--at)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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