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How to Use torsional constant "J" in AISC-13th to get torsional stres?

How to Use torsional constant "J" in AISC-13th to get torsional stres?

How to Use torsional constant "J" in AISC-13th to get torsional stres?

(OP)
I know for many AISC steel shape, torsional constant "J" differs graetly from polar moment of inertia. But are we supposed to use torsional constant "J" in AISC-13th steel shape the same way as polar moment of inertia to get the torsional stress of a AISC steel shape, i.e. Tau=T*r/J?

Thanks a lot!

RE: How to Use torsional constant "J" in AISC-13th to get torsional stres?

The Torsional Constant does not get the shear stress due to torsion except for round shapes.

It is a little more complicated than that for open shapes like W-Flanges and Channels

Check out AISC Design Guide #9 and it will help you out.

RE: How to Use torsional constant "J" in AISC-13th to get torsional stres?

I suggest using R instead of J as detailed in "Design of Welded Structures" by Blodgett.

RE: How to Use torsional constant "J" in AISC-13th to get torsional stres?

Yes - Blodgett covers it well.

RE: How to Use torsional constant "J" in AISC-13th to get torsional stres?

Take a look atAISC Design Guide 9, it outlines torsional analysis and design of steel members.  

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