I have a steel girder that sustains moment and axial compression.
The cross section is a rectangular box shape, the top, bottom plates and webs all have longitudinal stiffeners.
If I model it using 1D or 2D model,
Is Robot capable of checking it according to the Code?
Robot will not be able to check the local stability of a web with longitudinal stiffeners if this is part of your design process. If you mean the verification of the profile itself (a box with additional plates) you need to decide on the verification path you want to use (e.g. the same as for a box without plates) by assigning it the correct section type while saving the profile to the user section database. Mind that Robot supports code checking of profiles. If you mean the ribbed plate then this is not supported.
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.