I am trying to design a steel beam as per AISC 360-10 and trying to design against torsion as per AISC Design Guide 9. I have applied a torsion loading to the beam but when I look at the TRACK 2 output, I find that the software is not designing the member against torsion but is generating the following warning

  **WARNING- TORSION DESIGN OF MEMBER #     1 NOT POSSIBLE AS IT HAS NO TORSIONAL FORCES/STRESSES.

For torsion design as per AISC Design Guide 9, only member loads of the following types are considered as of now :

•concentrated torque (moment about local x axis)

•concentrated force eccentric from the member shear center

•uniformly distributed torque (full or partial)

•uniformly distributed force eccentric to the member shear center

•end torques (only considered when end supports are fixed)

Linearly varying torque is not considered in the torsion checks.

These are outlined in technical reference manual section 2.3.3.6 titled Design for Torsion

Most likely the torsion load that you applied on the member does not correspond to any of the types defined above. Try changing it to one of the above loading types and STAAD.Pro should be able to design for torsion.