Lateral Torsional Buckling - Bending 1

[jtjc23eng]

Hello,

For steel beam bending design, I was always under the impression that the compact/slenderness checks were only in AISC table B4.1b and that B4.1a does not apply. Today I heard someone mention that both B4.1a and B4.1b should be checked.

B4.1b seems to be appropriate since it is for members subject to flexure. If I am incorrect, could someone direct me to a reference to clear things up for me?

Thanks

 

[ProgrammingPE]

Table B4.1a is used to determine if the web as well as the flanges are NONSLENDER or SLENDER for COMPRESSION which is used in Chapter E to determine which section applies.

Table B4.1b is used to determine if the web as well as the flanges are COMPACT, NONCOMPACT, OR SLENDER for FLEXURE which is used in Chapter F to determine which section applies.

So if you are checking a beam strictly for flexure then you only need to consider Table B4.1b.

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[jtjc23eng]

Understood. Thanks for the clarification.