Post buckling behavior cannot be simulated using the buckling analysis in STAAD.Pro. Nonlinear Analysis would definitely be a better option to use if you are trying to account for the changes in stiffness due to deformed geometry and stress stiffening…

On troubleshooting the model further, we found the reason behind the zero buckling factors. If you carry out a PERFORM ANALYSIS with the loads you have applied, you will see that there are no axial forces developed in any of the members in your model…

Design of these sections are supported for many codes like the AISC 360-05 and AISC 360-10. If for any particular code, design is not supported, appropriate messages will be provided in the analysis output file.

The composite option is only meant for defining sections with steel beam and concrete flanges. I would suggest adding these sections to existing wide flange section database in STAAD.Pro and then use the options to add steel cover plates as needed. Please…

Generally for calculating properties for built up sections or non standard sections, you can use Section Wizard which is also integrated with STAAD.Pro. These sections can be formed using a combination of standard sections and plates and Section Wizard…

I did not see any issues with the model. The only thing that is missing is a LOAD LIST command before both the strength and the serviceability checks just to ensure that strength check is done for the combination 7 and serviceability check is done for…

In STAAD, there is no limitation. You can easily use any c/s from section database of any country and design it using other country code implemented STAAD.Pro.

You can use sections from any table to design it as per Eurocode.

Yes, the effect of flexural buckling is included in calculating the axial capacity of members ending up in compression. The effect of Lateral Torsional Buckling is not considered here as all the sections are tubular. The torsional effects, however if…