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Re: tube steel braces

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If you are using the tube for bracing in a braced frame, the more restrictive requirement applies.  Width/thickness ratios for braces are limited to values even more stringent than compact section criteria in order to avoid local buckling, or "oil-canning", which can lead to fracture in cyclical loading.

Also, a square does indeed fit the definition of a rectangle (a parallelogram with right angles).

Jason Emoto

>>> "david adie" <dadie(--nospam--at)bjgse.com> 09/22/00 06:12AM >>>
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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