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RE: Unbraced Length of Cantilever

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Unbraced length of the compression flange is 2 times the length of the
cantilever

David I. Ruby, S.E.

President, Ruby & Associates, P.C.
30445 Northwestern Hwy., Suite 310
Farmington Hills, MI 48334-3102

Phone:            (248) 865-8855
Fax:              (248) 865-9449
Cellular:         (248) 514-2677
E-mail:           druby(--nospam--at)rubyusa.com

-----Original Message-----
From: Ricky Leblanc [mailto:Rick.Leblanc(--nospam--at)Halliburton.com]
Sent: Thursday, December 07, 2000 8:37 AM
To: 'seaint(--nospam--at)seaint.org'
Subject: Unbraced Length of Cantilever


Here is the situation.  Cantilever beam (W36 shape) laterally braced at two
points on the top flange (free end and midspan).  These two points offer
bracing against lateral displacement only (no torsional restraint).  At the
fixed end there is full restraint about all bending axes (including
torsional).  Full shear restraint as well.  Under gravity load the top
flange is the tension flange and bottom flange is compression flange (i.e,
the lateral restraint is at tension flange only).  Major axis bending only,
no axial load.  Is the unbraced length of the compression flange the full
cantilevered span, or is it something more?

Thanks,

Rick LeBlanc, PE
Kellog, Brown & Root
Houston, TX