Hi there,
I was hoping to be able to carry out a non-linear buckling analysis of a beam under bending (i.e. not under axial). I need to do this to confirm the actual effective length of the member (ie. confirming whether my effective length factor is 0.7, 1.0 or somewhere in between). Can Robot do this?
Look forward to your response.
Regards, Nick
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Solved by Artur.Kosakowski. Go to Solution.
I'm not sure if I understand the situation correctly. Do you mean lateral buckling as there is no compression? Could you attach your model?
I do not have a model - I am wanting to understand if Robot has this capability. I have a member which is subject to bending (not axial) and I need to understand the effective length of the member. I could make an assessment of the effective length, however the effective segment lengths along the member are complex and an assumption may or may not be conservative. I was hoping to do a buckling analysis to confirm the actual effective length.
Sorry, I should have added that am referring to a lateral torsional buckling analysis.
That was my assumption
For bar elements such analysis type is not possible.
Hello Artur,
when you say ''for bar elements such analysis is not possible'' you mean bar elements in general?
Or for beams is possible?
And addition to that, this is basic question but what is essential different between bar and beam elements? If you can clear that out for me or point me out to the answer i would appreciate that.
Thanks
Ivan
In RSA there is only one type of bar element available therefore "bar" and "beam" element means the same.
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Hi nick,
this not possible for 1D element such as bars, beams, etc .... and it is normal because to make such analysis you will need to hava element with more than 6 degrees of freedom in order to simulate wrapping and torsion.
To do that kind of analysis in robot, then you will have to model your beam with shells for flange, web .. etc put the right supporting condition and perform a buckling analysis. Then you will see with buckling mode can be interpreted as LTB. With the critical load you will be able to get the effective lenght back.
Other solution : use this software https://www.cticm.com/content/ltbeam-version-1011 it is simple and allows for quick analyses. (note that there is a FEM calculation engine behind to perform the analysis as the method I explained...)