Frame buckling analysis

[Ashok]

Hi,
I am trying to do stability analysis of steel structures... Can I do a critical load analysis of a frame with vertical load? It's a single bay, single storey steel frame.
I am trying with eigen - but it is for natural frequency analysis I think - it is asking for mass.
Is it possible to get the buckling load and take the deformed shape - reduce it by a factor and do non-linear post buckling analysis ?
Kindly tell me the procedure...

Thank you,
Ashok.

[mhscott]

You can use corotational mesh with frames to get buckling loads: https://wp.me/pbejzW-Bh

[selimgunay]

You should also apply a small lateral displacement to initiate buckling along with the corotational formulation