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Bracing a W section
- To: seaint(--nospam--at)seaint.org
- Subject: Bracing a W section
- From: Michael Hemstad <mhemstad(--nospam--at)mbjeng.com>
- Date: Wed, 08 Feb 2006 09:45:30 -0600
Anantha Narayan wrote:
I am analysing an existing scoreboard for future expansion. It
has a horizontal truss with W14x30's being braced by 2 1/2 x 2 1/2 x 1/4 angles
(at the top and bottom flange).
Would be adequate to use a section having twice the section
properties as the 2 1/2 x 2 1/2 x 1/4 or are there any other ways to model the
I am using ETABS for my analyses.
That's how I would model it.
Taking a step beyond your question, if these small angles are
only welded (parallel to each other) to the flanges of the W14's and not back to
something solid, then I wouldn't consider the beams braced. In my mind, a
pair of beams can brace each other if there is a member between them which
prevents torsional displacement (twisting). In this case, a W14 or W12
attached with sufficient rigidity to each beam would prevent twisting; and even
if both beams moved laterally, absent axial load they cannot fail in
lateral-torsional buckling. But two small angles top and bottom do not
But, the picture I am drawing in my mind may not look much
like your scoreboard.
Mike Hemstad, P.E., S.E.
Meyer Borgman Johnson