weak axis bending for a channel lintel

[barnugget]

Are there any additional manuals available that provide a better analysis of weak axis bending for steel channels? ASD does not address the bending stress for this shape. I have a 12' opening and am trying to decide if an I beam may be needed instead.

 

[SacreBleu]

At the risk of oversimplifying this, I would use WSD method, 0.66 x Fy. No point in exact accuracy for this. Deflection will probably control anyway.

 

[JAE]

ASD Equation F1-1 perhaps?

 

[Lutfi]

I really do not like to use angles and channels (or any singly symmetrical members) for flexure.

AISC allows the use of 0.75Fy for weak axis bending stress for I, H shaped sections, rectangular plates and solid bars. See equation F2-1. This is due to the fact that these members tend to fail in yield and not buckling.

However, to be on the conservative side, I would use equation F2-2 (0.6Fy) for a channel.


Regards,
Lutfi