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RE: X-Bracing

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Rainier,

It depends on the support of your connections. If the point where braces
cross is not braced out-of-plane, then both braces could buckle in that
direction, which does NOT reduce your effective length by 50%.
ANSI/ASCE 10 ("Design of Latticed Steel Transmission Towers") and
ANSI/TIA/EIA 222 ("Structural Standards for Steel Antenna Towers ...")
both have good discussions on x-braced members used in towers.  Joseph
Yura has published good information on bracing as well.

HTH,
Dave K. Adams, S.E.
Lane Engineers, Inc.
979 N. Blackstone St.
Tulare, CA 93274
PH:  (559) 688-5263
FAX: (559) 688-8893
E-mail:  davea(--nospam--at)laneengineers.com




-----Original Message-----
From: RainCat1(--nospam--at)aol.com [mailto:RainCat1(--nospam--at)aol.com]
Sent: Tuesday, February 11, 2003 8:42 AM
To: seaint(--nospam--at)seaint.org
Subject: X-Bracing


What do you use as the effective length? Is it half the brace length for
both Ly & Lx or full length for one axis and half on the other axis? 
I know there were studies that you could use half the length of the
brace - could anyone point to the latest word on this topic?
Thanks a lot!

Rainier C. Catubig
San Diego, California

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