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Thank you Tara. Your answer helped a lot and it seams that when I make the mesh size too coarse local buckling contributes to the results. Regards

Dear all, I am performing a buckling analysis on a I beam section under uniform moment. I use S4R element. as i decrease the mesh size sometimes I get very strange results that I don't know if they are real buckling modes or not. Does anybody have any idea about that? Regards

Should I write tail-f Myfile.sta in qbaqus command prompt. It didn't work

Dear All, When I run an ABAQUS job from ABAQUS command prompt I need do monitor the job as well. Does anybody know a command for that and how can I stop(kill) the analysis in through command prompt when I need Regards

Dear Martin, You gave me vary good clues. Problem is solved now. thank you All the best

Problem is solved Thanks

Dear Friends When I write add the imperfection command to the input file *imperfection, file=myfile 1,1 and I run the analysis in the Abaqus command prompt, it seems that the analysis doesn't continue while without adding the imperfection command to the input file everything was alright. Does...

I don't know how to thank you Martin. I finally made the .fil output. then I made my model for Riks analysis and I opened its input file with notepad and I added *imperfection, file=mylastfile and then in abaqus command prompt I ran the new input file. then I imported it to abaqus for analysis...

thank You Martin I added this one to the input file. nothing happened. I submitted the job again but the input file was rewritten. then I decided aybe I can import the edited input file as a model but this time I faced this error: WARNING: The following keywords/parameters are not yet supported...

I think my first problem is that i don;t know where I have to write these commands. I use the command area which is at the same place of message area. is it correct?

I used the following command but Aabaqus gives error with the *. *NODE FILE, GLOBAL=YES, MODE=1, LAST MODE=1 ^ SyntaxError: invalid syntax >>> Is it something wrong with using * ?

How can I request output to a .file ? I am really in trouble

Hi all, I have done a Riks analysis to investigate the material nonlinearity on buckling moment. but when I add plastic characteristics nothing changes. does anybody know why?

Dear Mates, I have performed a Riks analysis to work out the influence of material plasticity on buckling moment. to make sure that the section yields before buckling moment reaches I used short spans. But the results are the same for both elastic and plastic materials.Does any body know what...

Thanks mate. I think the problem is that. i did not used any imperfection at all. I will try it

I checked the LPF but up to very large values for LPF the graph is still straight. what do you think may be the problem that it doesn't actually buckle

thank you mate

I have performed a Riks analysis. how can I work out buckling moment from that. I need the interaction between yielding and buckling moment

I have done a Riks analysis to investigate the interaction of yielding and buckling moment. How can I assess the results of a Riks anaysis to work out the buckling moment.

I want to do a post buckling analysis with riks method. first I did a linear buckling analysis and now i want to write the results to a result file as a nodal data to do the geometric imperfections for riks analysis. does anybody know how I should do that?