I am doing analysis with RC Frame System modeled with solid element with embedded Rebars. I proceeded with the step: Linear Perturbation--> Buckle, and used subspace for EigenSolver. However, I encountered an error: "Negative Eigen Values".

How to sort this out in Abaqus? I guess the problem should rise because of inadequacy in constraints or if the model is unstable, however, I don't think I have left any efforts to make it stable and properly constraint. I will appreciate the help. Thanks!

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