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Re: Bracing the compression flange on steel beam?

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The concept of bracing the compression flange of a flexural member is intended
to provide external boundary conditions for the lateral torsional buckling limit
state (failure mode for ASD types).  The brace must be strong enough and stiff
enough prevent the entire beam cross-section from either twisting or laterally
displacing.  This requires a brace member external to the member being braced.
The situation as you described does not qualify as a compression flange brace.

Rick Drake, SE
Fluor Daniel, Aliso Viejo


Andy Costello <acost(--nospam--at)> on 10/29/99 07:14:00 AM

Please respond to seaint(--nospam--at)

To:   seaint(--nospam--at)
cc:    (bcc: Rick Drake/AV/FD/FluorCorp)

Subject:  Bracing the compression flange on steel beam?

How about a technical question, for a change.
Is a lateral brace that is attached from the tension flange
to half way up the web considered an effective brace?
Some would say that the stiffness of the web can support its comp flange,
and keep the beam section from twisting, hence Lc reduced.
I have some references but still not clear, your option is appreciated.