Lateral Bracing of Compression Flange
Lateral Bracing of Compression Flange
(OP)
I have a W24x68 spanning 20 feet.
At the 1/3 points are W6x15's perpendicular at -4" below the W24's top flange on each side of the W24.
What is the unbraced length of the W24 for simple span bending?
20ft or 6'-8"?
Is there any AISC guideline for this type of framing?
In a framing scheme using simple connections the perpendicular members are usually framed to the web, just below the top flange, which would mean the compression flange of the main member is braced at that point.
However, can that connection be at any height in the web?
At what height does it no longer brace the compression flange for Lateral Buckling?
Thanks
At the 1/3 points are W6x15's perpendicular at -4" below the W24's top flange on each side of the W24.
What is the unbraced length of the W24 for simple span bending?
20ft or 6'-8"?
Is there any AISC guideline for this type of framing?
In a framing scheme using simple connections the perpendicular members are usually framed to the web, just below the top flange, which would mean the compression flange of the main member is braced at that point.
However, can that connection be at any height in the web?
At what height does it no longer brace the compression flange for Lateral Buckling?
Thanks






RE: Lateral Bracing of Compression Flange
RE: Lateral Bracing of Compression Flange
RE: Lateral Bracing of Compression Flange
"A rule of thumb is that the connection for a brace should extend at least into the upper 1/3 of the beam depth to consider is as lateral support for the top compression flange"
Of course this is a judgement, in my case the W6 is well within the upper 1/3.
In a follow-up December 1994 MSC
"The sub-framing need not attach directly to the compression flange."
RE: Lateral Bracing of Compression Flange
Mike McCann
McCann Engineering
RE: Lateral Bracing of Compression Flange
The problem is that it is pretty hard to fit a two bolt connection in a W6. It just isn't deep enough. A W6x15 only has a "T" dimension of 4 1/2".
RE: Lateral Bracing of Compression Flange
RE: Lateral Bracing of Compression Flange
RE: Lateral Bracing of Compression Flange
RE: Lateral Bracing of Compression Flange
RE: Lateral Bracing of Compression Flange
I believe the OP was originally typing about a lateral brace, which might work.
RE: Lateral Bracing of Compression Flange
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RE: Lateral Bracing of Compression Flange
RE: Lateral Bracing of Compression Flange
It's all in there....never thought to look.
I just have a copy given to me by anothe engineer, never attended the lectue.
Thanks again, that was a homerun.
RE: Lateral Bracing of Compression Flange