1. I think this can be replaced with one shear force resultant. Currently, we do not do this for shear. But we do consider this for the moment. The moment in the two planes are resolved into one single resultant component. I will discuss this with the development.
2. For Circular Hollow Sections, the AISC LRFD code has introduced the concept of using the Resultant Moments. STAAD uses the same concept for doing the EN 1993-1-1:2005 code checks. I think for sections which does not have a set of unique principle axes system, this will hold for the axial compression and bending interaction checks as well.
2. For Circular Hollow Sections, the AISC LRFD code has introduced the concept of using the Resultant Moments. STAAD uses the same concept for doing the EN 1993-1-1:2005 code checks. I think for sections which does not have a set of unique principle axes system, this will hold for the axial compression and bending interaction checks as well.
