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How to get the displacement under a load bigger than critical load

How to get the displacement under a load bigger than critical load

How to get the displacement under a load bigger than critical load

(OP)
Hi,everyone:
   After I do a bulking analysis, I got the critical load. But I wonder how can I get the displacement if I apply a load bigger than the critical value?

RE: How to get the displacement under a load bigger than critical load

This response assumes linear elastic analysis.  If you're doing a post-failure plactic analysis then please disregard this post

The idea behind bucking failure is that the structure becomes unstable if a load higher than Pcr is applied.

If the structure is unstable, then by definition the post-buckling deflection is undefined.

Picture a long column, like a 20' long piece of 1" pipe.  For a non-eccentric load, below the critical buckling load, lateral deflection of the pipe is essentially zero.  Once the pipe buckles, the deflection keeps increasing until the load is on the floor.

-Dan

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