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Dear All, I used buckle analysis to find the failure modes of a portal frame and then used the imperfection function to find the post buckle mechanism. However I'm am getting the following error message in the msg file ***NOTE: THE SOLUTION APPEARS TO BE DIVERGING. CONVERGENCE IS JUDGED...

Thanks again for the help. I assumed that was the case. I had a vertical load which in some modes was causing displacement in some crazy directions so i assumed these were false. Still trying to get my head round Abaqus so i think i'll leave the other program. One step at a time i think...

On the subject of the displacement of each mode, would i be correct in assuming that this is a visual check?

Think i'm on the right track now. Cheers for the reply.

I do apologise in advance if this is a stupid question. I have designed a portal frame then used the analysis Buckle and the eigensolver Lanczos. This has worked fine and i now have over a hundred eigenvalue results. I've looked at the manual and this states that the critical load = the...