Section aggregate

[k.manoj]

Dear Silvia:

I want to use uniaxial elastic material to aggregate torsion into the section in a 3D model. I don't want to use the default value. If I want to use the actual value calculated from each member (columns and beams), what is the value I should use for the tangent.
Is it shear modulus G or GJ where J is polar moment of inertia.
If use have any refrence please let me know.


Thanks.

[fmk]

GJ