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RE: Bracing the compression flange on steel beam?

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Title: RE: Bracing the compression flange on steel beam?

To be effective, a brace must either prevent lateral movement of the element(s) of the cross-section in compression or restrain the cross-section from twisting. The former is called direct bracing (a.k.a. discreet or nodal bracing). The latter is called torsional bracing. Most details provide some combination of these.

For your specific case, it depends upon the stiffness of your web as the detail is a little bit of direct bracing (indirect?) and more a torsional brace. Most webs will not provide sufficient stiffness in the case you describe. The response by Danny Moore suggests this as well.

Charlie

-----Original Message-----
From: Andy Costello [mailto:acost(--nospam--at)cwfab.com]
Sent: Friday, October 29, 1999 9:14 AM
To: seaint(--nospam--at)seaint.org
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.
Thanks,
Andy



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