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RE: tube steel braces

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To add further confusion the UBC refers to b/t
as "the outside wall width-thickness ratio" whereas
the AISC refers to "b" in this same ratio as the
flat width (typically D-4t)

Mark Pemberton, P.E.

-----Original Message-----
From: david adie [mailto:dadie(--nospam--at)bjgse.com]
Sent: Friday, September 22, 2000 6:12 AM
To: seaint(--nospam--at)seaint.org
Subject: tube steel braces


per 1997 ubc section 2213.8.2.5

from asd table b5.1, the max b/t ratio for square or rectangular tube steel
is 190 / sqrt(Fy)

from ubc section 2213.8.2.5, the max b/t ratio for rectangular tube steel is
110 / sqrt(Fy)

if i am using square tube steel, does the ubc requirement govern?  i have
heard engineers argue that it does because "square" is a subset of
"rectangular".

tia
da



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