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RE: x brace question

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What is the issue of the Modern Steel Construction you are referring to?  How did you adjust geometrical properties of the tubes (by reducing the wall thickness)?


Sasha Itsekson, PE

From: 	Sam Chang[:szchang(--nospam--at)]
Sent: 	Wednesday, March 11, 1998 12:55 AM
To: 	seaoc
Subject: 	Re: x brace question

I say yes in the plane of the braces but no on out of plane

If your application is located in a high seismic area, zone 3
or 4, you may want to learn more about the weakness of tubes
on going though many cycles of tension and compression to
absorb seismic energy.

Another thing about the tubes is that they are on average
93% of the true thickness listed in your table.  You need
to adjust your design accordinly.  Check the magazine
"Modern Steel Design".  I have adjusted the "I" and "S"
modulus on tubes in my designs.


Sam Chang, SE
Cupertino, CA

Tarek Mokhtar wrote:
> For an ordinary x braced steel frame with tube steel braces
> can one assume the brace buckling length for in and out of plane
> to be 1/2 the actual brace length ?
> Tarek Mokhtar