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RE: A53 pipe substitution for HSS pipe brace

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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?