Buckling analisys considering self weight.

disla

Hi everyone,

¿Does someone know which is the correct procedure to compute the buckling load considering self-weight?

Using the file from "LBA: Different Results with Internal VS CCX Solver post " and directly adding self-weight to see if it has significant effect on the buckling loads (should be slightly reduced) , it gives a completely different result.

Seems the solver treats the self-weight the same way as an external load but i do not think it is correct as it has a constant value independent of external BC.

Thanks in advance.

Victor

I think you might be able to do this with CCX by adding an extra *STEP initial section with gravity to load it separately from the loads for buckling. From the CCX manual:

All loads previous to a perturbation step are removed at the start of the step; only the load specified within the buckling step is scaled till buckling occurs

Or use nonlinear analysis like Aftab described in another thread.

I guess another possibility might be to iteratively tune the gravity load so that it reaches its correct value when multiplied by the buckling factor.

disla

Wow, didn't know about this option of separating the load from the loads for buckling. I will try. Seems the proper way to do it.

Thanks Victor.