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Buckling mode of I-profile

Buckling mode of I-profile

Buckling mode of I-profile

(OP)
Hi all,

I'm running a simple buckling analysis of a simply supported beam to determine the eigenvalues. I've used a I-profile on my beam, and the results are odd. Seems like there is no continuity in elements close to the load  I have no problems if I do this with a rectangular profile or a box profile. Does anybody know what could be causing this?

Kind regards

Senad

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